[SPIP] +2.1.12
[velocampus/web/www.git] / www / extensions / filtres_images / filtres / images_transforme.php
diff --git a/www/extensions/filtres_images/filtres/images_transforme.php b/www/extensions/filtres_images/filtres/images_transforme.php
new file mode 100644 (file)
index 0000000..a028408
--- /dev/null
@@ -0,0 +1,1585 @@
+<?php
+/***************************************************************************\
+ *  SPIP, Systeme de publication pour l'internet                           *
+ *                                                                         *
+ *  Copyright (c) 2001-2009                                                *
+ *  Arnaud Martin, Antoine Pitrou, Philippe Riviere, Emmanuel Saint-James  *
+ *                                                                         *
+ *  Ce programme est un logiciel libre distribue sous licence GNU/GPL.     *
+ *  Pour plus de details voir le fichier COPYING.txt ou l'aide en ligne.   *
+\***************************************************************************/
+
+if (!defined('_ECRIRE_INC_VERSION')) return;
+
+/**
+ * Toutes les fonctions image_xx de ce fichier :
+ *     - prennent une image en entree
+ *  - fournissent une image en sortie
+ *  - sont chainables les unes derrieres les autres dans toutes les combinaisons possibles
+ */
+
+// librairie de base du core
+include_spip('inc/filtres_images_mini');
+
+// 1/ Aplatir une image semi-transparente (supprimer couche alpha)
+// en remplissant la transparence avec couleur choisir $coul.
+// 2/ Forcer le format de sauvegarde (jpg, png, gif)
+// pour le format jpg, $qualite correspond au niveau de compression (defaut 85)
+// pour le format gif, $qualite correspond au nombre de couleurs dans la palette (defaut 128)
+// pour le format png, $qualite correspond au nombre de couleur dans la palette ou si 0 a une image truecolor (defaut truecolor)
+// attention, seul 128 est supporte en l'etat (production d'images avec palette reduite pas satisfaisante)
+// http://doc.spip.org/@image_aplatir
+// 3/ $transparence a "true" permet de conserver la transparence (utile pour conversion GIF)
+// http://doc.spip.org/@image_aplatir
+function image_aplatir($im, $format='jpg', $coul='000000', $qualite=NULL, $transparence=false)
+{
+       if ($qualite===NULL){
+               if ($format=='jpg') $qualite=_IMG_GD_QUALITE;
+               elseif ($format=='png') $qualite=0;
+               else $qualite=128;
+       }
+       $fonction = array('image_aplatir', func_get_args());
+       $image = _image_valeurs_trans($im, "aplatir-$format-$coul-$qualite-$transparence", $format, $fonction);
+
+       if (!$image) return("");
+
+       include_spip('inc/filtres');
+       $couleurs = _couleur_hex_to_dec($coul);
+       $dr= $couleurs["red"];
+       $dv= $couleurs["green"];
+       $db= $couleurs["blue"];
+
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+
+       if ($creer) {
+               $im = @$image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               if ($image["format_source"] == "gif" AND function_exists('ImageCopyResampled')) { 
+                       // Si un GIF est transparent, 
+                       // fabriquer un PNG transparent  
+                       // Conserver la transparence 
+                       @imagealphablending($im_, false); 
+                       @imagesavealpha($im_,true); 
+                       if (function_exists("imageAntiAlias")) imageAntiAlias($im_,true); 
+                       @ImageCopyResampled($im_, $im, 0, 0, 0, 0, $x_i, $y_i, $x_i, $y_i);
+                       imagedestroy($im);
+                       $im = $im_;
+               }
+               
+               // allouer la couleur de fond
+               if ($transparence) {
+                       @imagealphablending($im_, false); 
+                       @imagesavealpha($im_,true); 
+                       $color_t = imagecolorallocatealpha( $im_, $dr, $dv, $db, 127);
+               }
+               else $color_t = ImageColorAllocate( $im_, $dr, $dv, $db);
+               
+               imagefill ($im_, 0, 0, $color_t);
+
+               //??
+               //$dist = abs($trait);
+               
+               $transp_x = false;
+               
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y=0; $y < $y_i; $y++) {
+                       
+                               $rgb = ImageColorAt($im, $x, $y);
+                               $a = ($rgb >> 24) & 0xFF;
+                               $r = ($rgb >> 16) & 0xFF;
+                               $g = ($rgb >> 8) & 0xFF;
+                               $b = $rgb & 0xFF;
+
+                               $a = (127-$a) / 127;
+                               
+                               if ($a == 1) { // Limiter calculs
+                                       $r = $r;
+                                       $g = $g;
+                                       $b = $b;
+                               }
+                               else if ($a == 0) { // Limiter calculs
+                                       $r = $dr;
+                                       $g = $dv;
+                                       $b = $db;
+                                       
+                                       $transp_x = $x; // Memoriser un point transparent
+                                       $transp_y = $y;
+                                       
+                               } else {
+                                       $r = round($a * $r + $dr * (1-$a));
+                                       $g = round($a * $g + $dv * (1-$a));
+                                       $b = round($a * $b + $db * (1-$a));
+                               }
+                               $a = (1-$a) *127;
+                               $color = ImageColorAllocateAlpha( $im_, $r, $g, $b, $a);
+                               imagesetpixel ($im_, $x, $y, $color);   
+                       }
+               }
+               // passer en palette si besoin
+               if ($format=='gif' OR ($format=='png' AND $qualite!==0)){
+                       // creer l'image finale a palette (on recycle l'image initiale)                 
+
+
+                       @imagetruecolortopalette($im,true,$qualite);
+
+
+                       //$im = imagecreate($x_i, $y_i);
+                       // copier l'image true color vers la palette
+                       imagecopy($im, $im_, 0, 0, 0, 0, $x_i, $y_i);
+                       // matcher les couleurs au mieux par rapport a l'image initiale
+                       // si la fonction est disponible (php>=4.3)
+                       if (function_exists('imagecolormatch'))
+                               @imagecolormatch($im_, $im);
+                               
+                       if ($format=='gif' && $transparence && $transp_x) {     
+                               $color_t = ImagecolorAt( $im, $transp_x, $transp_y);
+                               if ($format == "gif" && $transparence) @imagecolortransparent($im, $color_t);
+                       }
+                               
+                               
+                       // produire le resultat
+                       _image_gd_output($im, $image, $qualite);
+               }
+               else
+                       _image_gd_output($im_, $image, $qualite);
+               imagedestroy($im_);
+               imagedestroy($im);
+       }
+       return _image_ecrire_tag($image,array('src'=>$dest));
+}
+
+
+// Enregistrer une image dans un format donne
+// (conserve la transparence gif, png, ico)
+// utilise [->@image_aplatir]
+// http://doc.spip.org/@image_format
+function image_format($img, $format='png') {
+       $qualite = null;
+       if ($format=='png8') {$format='png';$qualite=128;}
+       return image_aplatir($img, $format, 'cccccc', $qualite, true);
+}
+
+
+// Transforme l'image en PNG transparent
+// alpha = 0: aucune transparence
+// alpha = 127: completement transparent
+// http://doc.spip.org/@image_alpha
+function image_alpha($im, $alpha = 63)
+{
+       $fonction = array('image_alpha', func_get_args());
+       $image = _image_valeurs_trans($im, "alpha-$alpha", "png",$fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               // Creation de l'image en deux temps
+               // de facon a conserver les GIF transparents
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im2 = imagecreatetruecolor($x_i, $y_i);
+               @imagealphablending($im2, false);
+               @imagesavealpha($im2,true);
+               $color_t = ImageColorAllocateAlpha( $im2, 255, 255, 255 , 127 );
+               imagefill ($im2, 0, 0, $color_t);
+               imagecopy($im2, $im, 0, 0, 0, 0, $x_i, $y_i);
+
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               imagealphablending ($im_, FALSE );
+               imagesavealpha ( $im_, TRUE );
+
+
+
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y = 0; $y < $y_i; $y++) {
+                               $rgb = ImageColorAt($im2, $x, $y);
+                               
+                               if (function_exists('imagecolorallocatealpha')) {
+                                       $a = ($rgb >> 24) & 0xFF;
+                                       $r = ($rgb >> 16) & 0xFF;
+                                       $g = ($rgb >> 8) & 0xFF;
+                                       $b = $rgb & 0xFF;
+                                       
+                                       
+                                       $a_ = $alpha + $a - round($a*$alpha/127);
+                                       $rgb = imagecolorallocatealpha($im_, $r, $g, $b, $a_);
+                               }
+                               imagesetpixel ( $im_, $x, $y, $rgb );
+                       }
+               }
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+               imagedestroy($im2);
+       }
+       
+
+       return _image_ecrire_tag($image,array('src'=>$dest));
+       
+}
+
+// http://doc.spip.org/@image_recadre
+function image_recadre($im,$width,$height,$position='center', $background_color='white')
+{
+       $fonction = array('image_recadre', func_get_args());
+       $image = _image_valeurs_trans($im, "recadre-$width-$height-$position-$background_color",false,$fonction);
+       
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       if ($width==0) $width=$x_i;
+       if ($height==0) $height=$y_i;
+       
+       $offset_width = $x_i-$width;
+       $offset_height = $y_i-$height;
+       $position=strtolower($position);
+       if (strpos($position,'left')!==FALSE){
+               if (preg_match(';left=(\d{1}\d+);', $position, $left)){
+                       $offset_width=$left[1]; 
+               }
+               else{
+                       $offset_width=0;
+               }
+       }
+       elseif (strpos($position,'right')!==FALSE)
+               $offset_width=$offset_width;
+       else
+               $offset_width=intval(ceil($offset_width/2));
+
+       if (strpos($position,'top')!==FALSE){
+               if (preg_match(';top=(\d{1}\d+);', $position, $top)){
+                       $offset_height=$top[1];
+               }
+               else{
+                       $offset_height=0;
+               }
+       }
+       elseif (strpos($position,'bottom')!==FALSE)
+               $offset_height=$offset_height;
+       else
+               $offset_height=intval(ceil($offset_height/2));
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im_ = imagecreatetruecolor($width, $height);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+
+               if ($background_color=='transparent')
+                       $color_t = imagecolorallocatealpha( $im_, 255, 255, 255 , 127 );
+               else {
+                       $bg = _couleur_hex_to_dec($background_color);
+                       $color_t = imagecolorallocate( $im_, $bg['red'], $bg['green'], $bg['blue']);
+               }
+               imagefill ($im_, 0, 0, $color_t);
+               imagecopy($im_, $im, max(0,-$offset_width), max(0,-$offset_height), max(0,$offset_width), max(0,$offset_height), min($width,$x_i), min($height,$y_i));
+
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+       }
+       
+       return _image_ecrire_tag($image,array('src'=>$dest,'width'=>$width,'height'=>$height));
+}
+
+
+/**
+ * Recadrer une image dans le rectangle le plus petit possible sans perte
+ * de pixels non transparent
+ *
+ * @param string $im
+ * @return string
+ */
+function image_recadre_mini($im)
+{
+       $fonction = array('image_recadre_mini', func_get_args());
+       $image = _image_valeurs_trans($im, "recadre_mini",false,$fonction);
+
+       if (!$image) return("");
+
+       $width = $image["largeur"];
+       $height = $image["hauteur"];
+
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+
+       $creer = $image["creer"];
+       if ($creer) {
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+
+               // trouver le rectangle mini qui contient des infos de couleur
+               // recherche optimisee qui ne balaye que par zone
+               $min_x = $width;
+               $min_y = $height;
+               $max_y = $max_x = 0;
+               $yy = 0;
+               while ($yy<=$height/2 AND $max_y<=$min_y){
+                       if($yy<$min_y)
+                               for ($xx = 0; $xx < $width; $xx++) {
+                                       $color_index = imagecolorat($im, $xx, $yy);
+                                       $color_tran = imagecolorsforindex($im, $color_index);
+                                       if ($color_tran['alpha']!==127){
+                                               $min_y = min($yy,$min_y);
+                                               $max_y = max($height-1-$yy,$max_y);
+                                               break;
+                                       }
+                               }
+                       if($height-1-$yy>$max_y)
+                               for ($xx = 0; $xx < $width; $xx++) {
+                                       $color_index = imagecolorat($im, $xx, $height-1-$yy);
+                                       $color_tran = imagecolorsforindex($im, $color_index);
+                                       if ($color_tran['alpha']!==127){
+                                               $min_y = min($yy,$min_y);
+                                               $max_y = max($height-1-$yy,$max_y);
+                                               break;
+                                       }
+                               }
+                       $yy++;
+               }
+               $min_y = min($max_y,$min_y); // tout a 0 aucun pixel trouve
+
+               $xx = 0;
+               while ($xx<=$width/2 AND $max_x<=$min_x){
+                       if ($xx<$min_x)
+                               for ($yy = $min_y; $yy < $max_y; $yy++) {
+                                       $color_index = imagecolorat($im, $xx, $yy);
+                                       $color_tran = imagecolorsforindex($im, $color_index);
+                                       if ($color_tran['alpha']!==127){
+                                               $min_x = min($xx,$min_x);
+                                               $max_x = max($xx,$max_x);
+                                               break; // inutile de continuer sur cette colonne
+                                       }
+                               }
+                       if ($width-1-$xx>$max_x)
+                               for ($yy = $min_y; $yy < $max_y; $yy++) {
+                                       $color_index = imagecolorat($im, $width-1-$xx, $yy);
+                                       $color_tran = imagecolorsforindex($im, $color_index);
+                                       if ($color_tran['alpha']!==127){
+                                               $min_x = min($width-1-$xx,$min_x);
+                                               $max_x = max($width-1-$xx,$max_x);
+                                               break; // inutile de continuer sur cette colonne
+                                       }
+                               }
+                       $xx++;
+               }
+               $min_x = min($max_x,$min_x); // tout a 0 aucun pixel trouve
+
+               $width = $max_x-$min_x+1;
+               $height = $max_y-$min_y+1;
+
+               $im_ = imagecreatetruecolor($width, $height);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+
+               $color_t = imagecolorallocatealpha( $im_, 255, 255, 255 , 127 );
+               imagefill ($im_, 0, 0, $color_t);
+               imagecopy($im_, $im, 0, 0, $min_x, $min_y, $width, $height);
+
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+       }
+       else {
+               list ($height,$width) = taille_image($image['fichier_dest']);
+       }
+
+       return _image_ecrire_tag($image,array('src'=>$dest,'width'=>$width,'height'=>$height));
+}
+
+
+// http://doc.spip.org/@image_flip_vertical
+function image_flip_vertical($im)
+{
+       $fonction = array('image_flip_vertical', func_get_args());
+       $image = _image_valeurs_trans($im, "flip_v", false,$fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+       
+               $color_t = ImageColorAllocateAlpha( $im_, 255, 255, 255 , 127 );
+               imagefill ($im_, 0, 0, $color_t);
+
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y = 0; $y < $y_i; $y++) {
+                               imagecopy($im_, $im, $x_i - $x - 1, $y, $x, $y, 1, 1);
+                       }
+               }
+
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+       }
+       
+       return _image_ecrire_tag($image,array('src'=>$dest));
+}
+
+// http://doc.spip.org/@image_flip_horizontal
+function image_flip_horizontal($im)
+{
+       $fonction = array('image_flip_horizontal', func_get_args());
+       $image = _image_valeurs_trans($im, "flip_h",false,$fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+       
+               $color_t = ImageColorAllocateAlpha( $im_, 255, 255, 255 , 127 );
+               imagefill ($im_, 0, 0, $color_t);
+
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y = 0; $y < $y_i; $y++) {
+                               imagecopy($im_, $im, $x, $y_i - $y - 1, $x, $y, 1, 1);
+                       }
+               }
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+       }
+       
+       return _image_ecrire_tag($image,array('src'=>$dest));
+}
+
+// http://doc.spip.org/@image_masque
+function image_masque($im, $masque, $pos="") {
+       // Passer, en plus de l'image d'origine,
+       // une image de "masque": un fichier PNG24 transparent.
+       // Le decoupage se fera selon la transparence du "masque",
+       // et les couleurs seront eclaircies/foncees selon de couleur du masque.
+       // Pour ne pas modifier la couleur, le masque doit etre en gris 50%.
+       //
+       // Si l'image source est plus grande que le masque, alors cette image est reduite a la taille du masque.
+       // Sinon, c'est la taille de l'image source qui est utilisee.
+       //
+       // $pos est une variable libre, qui permet de passer left=..., right=..., bottom=..., top=...
+       // dans ce cas, le pasque est place a ces positions sur l'image d'origine,
+       // et evidemment cette image d'origine n'est pas redimensionnee
+       // 
+       // Positionnement horizontal: text-align=left, right, center
+       // Positionnement vertical : vertical-align: top, bottom, middle
+       // (les positionnements left, right, top, left sont relativement inutiles, mais coherence avec CSS)
+       //
+       // Choix du mode de fusion: mode=masque, normal, eclaircir, obscurcir, produit, difference
+       // masque: mode par defaut
+       // normal: place la nouvelle image par dessus l'ancienne
+       // eclaircir: place uniquement les points plus clairs
+       // obscurcir: place uniquement les points plus fonc'es
+       // produit: multiplie par le masque (points noirs rendent l'image noire, points blancs ne changent rien)
+       // difference: remplit avec l'ecart entre les couleurs d'origine et du masque
+
+       $mode = "masque";
+
+
+       $numargs = func_num_args();
+       $arg_list = func_get_args();
+       $texte = $arg_list[0];
+       for ($i = 1; $i < $numargs; $i++) {
+               if ( ($p = strpos($arg_list[$i],"=")) !==false) {
+                       $nom_variable = substr($arg_list[$i], 0, $p);
+                       $val_variable = substr($arg_list[$i], $p+1);
+                       $variable["$nom_variable"] = $val_variable;
+                       $defini["$nom_variable"] = 1;
+               }
+       }
+       if ($defini["mode"]) $mode = $variable["mode"];
+
+       $masque = find_in_path($masque);
+       $pos = md5(serialize($variable).@filemtime($masque));
+
+       $fonction = array('image_masque', func_get_args());
+       $image = _image_valeurs_trans($im, "masque-$masque-$pos", "png",$fonction);
+       if (!$image) return("");
+
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+
+
+       if ($defini["right"] OR $defini["left"] OR $defini["bottom"] OR $defini["top"] OR $defini["text-align"] OR $defini["vertical-align"]) {
+               $placer = true;
+       }
+       else $placer = false;
+
+       if ($creer) {
+               
+               $mask = _image_valeurs_trans($masque,"");
+               if (!is_array($mask)) return("");
+               $im_m = $mask["fichier"];
+               $x_m = $mask["largeur"];
+               $y_m = $mask["hauteur"];
+       
+               $im2 = $mask["fonction_imagecreatefrom"]($masque);
+               if ($mask["format_source"] == "gif" AND function_exists('ImageCopyResampled')) { 
+                       $im2_ = imagecreatetruecolor($x_m, $y_m);
+                       // Si un GIF est transparent, 
+                       // fabriquer un PNG transparent  
+                       // Conserver la transparence 
+                       if (function_exists("imageAntiAlias")) imageAntiAlias($im2_,true); 
+                       @imagealphablending($im2_, false); 
+                       @imagesavealpha($im2_,true); 
+                       @ImageCopyResampled($im2_, $im2, 0, 0, 0, 0, $x_m, $y_m, $x_m, $y_m);
+                       imagedestroy($im2);
+                       $im2 = $im2_;
+               }
+               
+               if ($placer) {
+                       // On fabriquer une version "agrandie" du masque,
+                       // aux dimensions de l'image source
+                       // et on "installe" le masque dans cette image
+                       // ainsi: aucun redimensionnement
+                       
+                       $dx = 0;
+                       $dy = 0;
+                       
+                       if ($defini["right"]) {
+                               $right = $variable["right"];
+                               $dx = ($x_i - $x_m) - $right;
+                       }
+                       if ($defini["bottom"]) {
+                               $bottom = $variable["bottom"];
+                               $dy = ($y_i - $y_m) - $bottom;
+                               }
+                       if ($defini["top"]) {
+                               $top = $variable["top"];
+                               $dy = $top;
+                       }
+                       if ($defini["left"]) {
+                               $left = $variable["left"];
+                               $dx = $left;
+                       }
+                       if ($defini["text-align"]) {
+                               $align = $variable["text-align"];
+                               if ($align == "right") {
+                                       $right = 0;
+                                       $dx = ($x_i - $x_m);
+                               } else if ($align == "left") {
+                                       $left = 0;
+                                       $dx = 0;
+                               } else if ($align = "center") {
+                                       $dx = round( ($x_i - $x_m) / 2 ) ;
+                               }
+                       }
+                       if ($defini["vertical-align"]) {
+                               $valign = $variable["vertical-align"];
+                               if ($valign == "bottom") {
+                                       $bottom = 0;
+                                       $dy = ($y_i - $y_m);
+                               } else if ($valign == "top") {
+                                       $top = 0;
+                                       $dy = 0;
+                               } else if ($valign = "middle") {
+                                       $dy = round( ($y_i - $y_m) / 2 ) ;
+                               }
+                       }
+                       
+                       
+                       $im3 = imagecreatetruecolor($x_i, $y_i);
+                       @imagealphablending($im3, false);
+                       @imagesavealpha($im3,true);
+                       if ($mode == "masque") $color_t = ImageColorAllocateAlpha( $im3, 128, 128, 128 , 0 );
+                       else $color_t = ImageColorAllocateAlpha( $im3, 128, 128, 128 , 127 );
+                       imagefill ($im3, 0, 0, $color_t);
+
+                       
+
+                       imagecopy ( $im3, $im2, $dx, $dy, 0, 0, $x_m, $y_m);    
+
+                       imagedestroy($im2);
+                       $im2 = imagecreatetruecolor($x_i, $y_i);
+                       @imagealphablending($im2, false);
+                       @imagesavealpha($im2,true);
+                       
+                       
+                       
+                       imagecopy ( $im2, $im3, 0, 0, 0, 0, $x_i, $y_i);                        
+                       imagedestroy($im3);
+                       $x_m = $x_i;
+                       $y_m = $y_i;
+               }
+               
+       
+               $rapport = $x_i / $x_m;
+               if (($y_i / $y_m) < $rapport ) {
+                       $rapport = $y_i / $y_m;
+               }
+                       
+               $x_d = ceil($x_i / $rapport);
+               $y_d = ceil($y_i / $rapport);
+               
+
+               if ($x_i < $x_m OR $y_i < $y_m) {
+                       $x_dest = $x_i;
+                       $y_dest = $y_i;
+                       $x_dec = 0;
+                       $y_dec = 0;
+               } else {
+                       $x_dest = $x_m;
+                       $y_dest = $y_m;
+                       $x_dec = round(($x_d - $x_m) /2);
+                       $y_dec = round(($y_d - $y_m) /2);
+               }
+
+
+               $nouveau = _image_valeurs_trans(image_reduire($im, $x_d, $y_d),"");
+               if (!is_array($nouveau)) return("");
+               $im_n = $nouveau["fichier"];
+               
+       
+               $im = $nouveau["fonction_imagecreatefrom"]($im_n);
+               imagepalettetotruecolor($im);
+               if ($nouveau["format_source"] == "gif" AND function_exists('ImageCopyResampled')) { 
+                       $im_ = imagecreatetruecolor($x_dest, $y_dest);
+                       // Si un GIF est transparent, 
+                       // fabriquer un PNG transparent  
+                       // Conserver la transparence 
+                       if (function_exists("imageAntiAlias")) imageAntiAlias($im_,true); 
+                       @imagealphablending($im_, false); 
+                       @imagesavealpha($im_,true); 
+                       @ImageCopyResampled($im_, $im, 0, 0, 0, 0, $x_dest, $y_dest, $x_dest, $y_dest);
+                       imagedestroy($im);
+                       $im = $im_;
+               }
+               $im_ = imagecreatetruecolor($x_dest, $y_dest);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+               $color_t = ImageColorAllocateAlpha( $im_, 255, 255, 255 , 127 );
+               imagefill ($im_, 0, 0, $color_t);
+
+
+               for ($x = 0; $x < $x_dest; $x++) {
+                       for ($y=0; $y < $y_dest; $y++) {
+                               $rgb = ImageColorAt($im2, $x, $y);
+                               $a = ($rgb >> 24) & 0xFF;
+                               $r = ($rgb >> 16) & 0xFF;
+                               $g = ($rgb >> 8) & 0xFF;
+                               $b = $rgb & 0xFF;
+                               
+
+                               $rgb2 = ImageColorAt($im, $x+$x_dec, $y+$y_dec);
+                               $a2 = ($rgb2 >> 24) & 0xFF;
+                               $r2 = ($rgb2 >> 16) & 0xFF;
+                               $g2 = ($rgb2 >> 8) & 0xFF;
+                               $b2 = $rgb2 & 0xFF;
+                               
+                               
+                               
+                               if ($mode == "normal") {
+                                       $v = (127 - $a) / 127;
+                                       if ($v == 1) {
+                                               $r_ = $r;
+                                               $g_ = $g;
+                                               $b_ = $b;
+                                       } else {
+                                               $v2 = (127 - $a2) / 127;
+                                               if ($v+$v2 == 0) {
+                                                       $r_ = $r2;
+                                                       $g_ = $g2;
+                                                       $b_ = $b2;
+                                               } else if ($v2 ==0) {
+                                                       $r_ = $r;
+                                                       $g_ = $g;
+                                                       $b_ = $b;
+                                               } else if ($v == 0) {
+                                                       $r_ = $r2;
+                                                       $g_ = $g2;
+                                                       $b_ = $b2;
+                                               }else {
+                                                       $r_ = $r + (($r2 - $r) * $v2 * (1 - $v));
+                                                       $g_ = $g + (($g2 - $g) * $v2 * (1 - $v));
+                                                       $b_ = $b + (($b2 - $b) * $v2 * (1 - $v));
+                                               }
+                                       }
+                                       $a_ = min($a,$a2);
+                               } elseif ($mode == "produit" OR $mode == "difference") {                                        
+
+                                       if ($mode == "produit") {
+                                               $r = ($r/255) * $r2;
+                                               $g = ($g/255) * $g2;
+                                               $b = ($b/255) * $b2;
+                                       } else if ($mode == "difference") {
+                                               $r = abs($r-$r2);
+                                               $g = abs($g-$g2);
+                                               $b = abs($b-$b2);                               
+                                       }
+
+                                       $r = max(0, min($r, 255));
+                                       $g = max(0, min($g, 255));
+                                       $b = max(0, min($b, 255));
+
+                                       $v = (127 - $a) / 127;
+                                       if ($v == 1) {
+                                               $r_ = $r;
+                                               $g_ = $g;
+                                               $b_ = $b;
+                                       } else {
+                                               $v2 = (127 - $a2) / 127;
+                                               if ($v+$v2 == 0) {
+                                                       $r_ = $r2;
+                                                       $g_ = $g2;
+                                                       $b_ = $b2;
+                                               } else {
+                                                       $r_ = $r + (($r2 - $r) * $v2 * (1 - $v));
+                                                       $g_ = $g + (($g2 - $g) * $v2 * (1 - $v));
+                                                       $b_ = $b + (($b2 - $b) * $v2 * (1 - $v));
+                                               }
+                                       }
+
+
+                                       $a_ = $a2;
+                               } elseif ($mode == "eclaircir" OR $mode == "obscurcir") {
+                                       $v = (127 - $a) / 127;
+                                       if ($v == 1) {
+                                               $r_ = $r;
+                                               $g_ = $g;
+                                               $b_ = $b;
+                                       } else {
+                                               $v2 = (127 - $a2) / 127;
+                                               if ($v+$v2 == 0) {
+                                                       $r_ = $r2;
+                                                       $g_ = $g2;
+                                                       $b_ = $b2;
+                                               } else {
+                                                       $r_ = $r + (($r2 - $r) * $v2 * (1 - $v));
+                                                       $g_ = $g + (($g2 - $g) * $v2 * (1 - $v));
+                                                       $b_ = $b + (($b2 - $b) * $v2 * (1 - $v));
+                                               }
+                                       }
+                                       if ($mode == "eclaircir") {
+                                               $r_ = max ($r_, $r2);
+                                               $g_ = max ($g_, $g2);
+                                               $b_ = max ($b_, $b2);
+                                       } else {
+                                               $r_ = min ($r_, $r2);
+                                               $g_ = min ($g_, $g2);
+                                               $b_ = min ($b_, $b2);                                   
+                                       }
+                                       
+                                       $a_ = min($a,$a2);
+                               } else {
+                                       $r_ = $r2 + 1 * ($r - 127);
+                                       $r_ = max(0, min($r_, 255));
+                                       $g_ = $g2 + 1 * ($g - 127);
+                                       $g_ = max(0, min($g_, 255));
+                                       $b_ = $b2 + 1 * ($b - 127);
+                                       $b_ = max(0, min($b_, 255));
+                                       
+                                       $a_ = $a + $a2 - round($a*$a2/127);
+                               }
+
+                               $color = ImageColorAllocateAlpha( $im_, $r_, $g_, $b_ , $a_ );
+                               imagesetpixel ($im_, $x, $y, $color);                   
+                       }
+               }
+
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+               imagedestroy($im2);
+
+       }
+       $x_dest = largeur($dest);
+       $y_dest = hauteur($dest);
+       return _image_ecrire_tag($image,array('src'=>$dest,'width'=>$x_dest,'height'=>$y_dest));
+}
+
+// Passage de l'image en noir et blanc
+// un noir & blanc "photo" n'est pas "neutre": les composantes de couleur sont
+// ponderees pour obtenir le niveau de gris;
+// on peut ici regler cette ponderation en "pour mille"
+// http://doc.spip.org/@image_nb
+function image_nb($im, $val_r = 299, $val_g = 587, $val_b = 114)
+{
+       $fonction = array('image_nb', func_get_args());
+       $image = _image_valeurs_trans($im, "nb-$val_r-$val_g-$val_b",false,$fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       // Methode precise
+       // resultat plus beau, mais tres lourd
+       // Et: indispensable pour preserver transparence!
+
+       if ($creer) {
+               // Creation de l'image en deux temps
+               // de facon a conserver les GIF transparents
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+               $color_t = ImageColorAllocateAlpha( $im_, 255, 255, 255 , 127 );
+               imagefill ($im_, 0, 0, $color_t);
+               imagecopy($im_, $im, 0, 0, 0, 0, $x_i, $y_i);
+               
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y=0; $y < $y_i; $y++) {
+                               $rgb = ImageColorAt($im_, $x, $y);
+                               $a = ($rgb >> 24) & 0xFF;
+                               $r = ($rgb >> 16) & 0xFF;
+                               $g = ($rgb >> 8) & 0xFF;
+                               $b = $rgb & 0xFF;
+
+                               $c = round(($val_r * $r / 1000) + ($val_g * $g / 1000) + ($val_b * $b / 1000));
+                               if ($c < 0) $c = 0;
+                               if ($c > 254) $c = 254;
+                               
+                               
+                               $color = ImageColorAllocateAlpha( $im_, $c, $c, $c , $a );
+                               imagesetpixel ($im_, $x, $y, $color);                   
+                       }
+               }
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+       }
+
+       return _image_ecrire_tag($image,array('src'=>$dest));
+}
+
+// http://doc.spip.org/@image_flou
+function image_flou($im,$niveau=3)
+{
+       // Il s'agit d'une modification du script blur qu'on trouve un peu partout:
+       // + la transparence est geree correctement
+       // + les dimensions de l'image sont augmentees pour flouter les bords
+       $coeffs = array (
+                               array ( 1),
+                               array ( 1, 1), 
+                               array ( 1, 2, 1),
+                               array ( 1, 3, 3, 1),
+                               array ( 1, 4, 6, 4, 1),
+                               array ( 1, 5, 10, 10, 5, 1),
+                               array ( 1, 6, 15, 20, 15, 6, 1),
+                               array ( 1, 7, 21, 35, 35, 21, 7, 1),
+                               array ( 1, 8, 28, 56, 70, 56, 28, 8, 1),
+                               array ( 1, 9, 36, 84, 126, 126, 84, 36, 9, 1),
+                               array ( 1, 10, 45, 120, 210, 252, 210, 120, 45, 10, 1),
+                               array ( 1, 11, 55, 165, 330, 462, 462, 330, 165, 55, 11, 1)
+                               );
+       
+       $fonction = array('image_flou', func_get_args());
+       $image = _image_valeurs_trans($im, "flou-$niveau", false,$fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       $sum = pow (2, $niveau);
+
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       // Methode precise
+       // resultat plus beau, mais tres lourd
+       // Et: indispensable pour preserver transparence!
+
+       if ($creer) {
+               // Creation de l'image en deux temps
+               // de facon a conserver les GIF transparents
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $temp1 = imagecreatetruecolor($x_i+$niveau, $y_i);
+               $temp2 = imagecreatetruecolor($x_i+$niveau, $y_i+$niveau);
+               
+               @imagealphablending($temp1, false);
+               @imagesavealpha($temp1,true);
+               @imagealphablending($temp2, false);
+               @imagesavealpha($temp2,true);
+
+               
+               for ($i = 0; $i < $x_i+$niveau; $i++) {
+                       for ($j=0; $j < $y_i; $j++) {
+                               $suma=0;
+                               $sumr=0;
+                               $sumg=0;
+                               $sumb=0;
+                               $sum = 0;
+                               $sum_ = 0;
+                               for ( $k=0 ; $k <= $niveau ; ++$k ) {
+                                       $color = imagecolorat($im, $i_ = ($i-$niveau)+$k , $j);
+
+                                       $a = ($color >> 24) & 0xFF;
+                                       $r = ($color >> 16) & 0xFF;
+                                       $g = ($color >> 8) & 0xFF;
+                                       $b = ($color) & 0xFF;
+                                       
+                                       if ($i_ < 0 OR $i_ >= $x_i) $a = 127;
+                                       
+                                       $coef = $coeffs[$niveau][$k];
+                                       $suma += $a*$coef;
+                                       $ac = ((127-$a) / 127);
+                                       
+                                       $ac = $ac*$ac;
+                                       
+                                       $sumr += $r * $coef * $ac;
+                                       $sumg += $g * $coef * $ac;
+                                       $sumb += $b * $coef * $ac;
+                                       $sum += $coef * $ac;
+                                       $sum_ += $coef;
+                               }
+                               if ($sum > 0) $color = ImageColorAllocateAlpha ($temp1, $sumr/$sum, $sumg/$sum, $sumb/$sum, $suma/$sum_);
+                               else $color = ImageColorAllocateAlpha ($temp1, 255, 255, 255, 127);
+                               imagesetpixel($temp1,$i,$j,$color);
+                       }
+               }
+               imagedestroy($im);
+               for ($i = 0; $i < $x_i+$niveau; $i++) {
+                       for ($j=0; $j < $y_i+$niveau; $j++) {
+                               $suma=0;
+                               $sumr=0;
+                               $sumg=0;
+                               $sumb=0;
+                               $sum = 0;
+                               $sum_ = 0;
+                               for ( $k=0 ; $k <= $niveau ; ++$k ) {
+                                       $color = imagecolorat($temp1, $i, $j_ = $j-$niveau+$k);
+                                       $a = ($color >> 24) & 0xFF;
+                                       $r = ($color >> 16) & 0xFF;
+                                       $g = ($color >> 8) & 0xFF;
+                                       $b = ($color) & 0xFF;
+                                       if ($j_ < 0 OR $j_ >= $y_i) $a = 127;
+                                       
+                                       $suma += $a*$coeffs[$niveau][$k];
+                                       $ac = ((127-$a) / 127);
+                                                                               
+                                       $sumr += $r * $coeffs[$niveau][$k] * $ac;
+                                       $sumg += $g * $coeffs[$niveau][$k] * $ac;
+                                       $sumb += $b * $coeffs[$niveau][$k] * $ac;
+                                       $sum += $coeffs[$niveau][$k] * $ac;
+                                       $sum_ += $coeffs[$niveau][$k];
+                                       
+                               }
+                               if ($sum > 0) $color = ImageColorAllocateAlpha ($temp2, $sumr/$sum, $sumg/$sum, $sumb/$sum, $suma/$sum_);
+                               else $color = ImageColorAllocateAlpha ($temp2, 255, 255, 255, 127);
+                               imagesetpixel($temp2,$i,$j,$color);
+                       }
+               }
+       
+               _image_gd_output($temp2,$image);
+               imagedestroy($temp1);   
+               imagedestroy($temp2);   
+       }
+       
+       return _image_ecrire_tag($image,array('src'=>$dest,'width'=>($x_i+$niveau),'height'=>($y_i+$niveau)));
+}
+
+// http://doc.spip.org/@image_RotateBicubic
+function image_RotateBicubic($src_img, $angle, $bicubic=0) {
+       include_spip('filtres/images_lib');
+   
+       if (round($angle/90)*90 == $angle) {
+               $droit = true;
+               if (round($angle/180)*180 == $angle) $rot = 180;
+               else $rot = 90;
+       }
+       else 
+               $droit = false;
+   
+       // convert degrees to radians
+       $angle = $angle + 180;
+       $angle = deg2rad($angle);
+       
+       
+       
+       $src_x = imagesx($src_img);
+       $src_y = imagesy($src_img);
+       
+       
+       $center_x = floor(($src_x-1)/2);
+       $center_y = floor(($src_y-1)/2);
+       
+       $cosangle = cos($angle);
+       $sinangle = sin($angle);
+
+       // calculer dimensions en simplifiant angles droits, ce qui evite "floutage"
+       // des rotations a angle droit
+       if (!$droit) {
+               $corners=array(array(0,0), array($src_x,0), array($src_x,$src_y), array(0,$src_y));
+       
+               foreach($corners as $key=>$value) {
+                       $value[0]-=$center_x;        //Translate coords to center for rotation
+                       $value[1]-=$center_y;
+                       $temp=array();
+                       $temp[0]=$value[0]*$cosangle+$value[1]*$sinangle;
+                       $temp[1]=$value[1]*$cosangle-$value[0]*$sinangle;
+                       $corners[$key]=$temp;    
+               }
+          
+               $min_x=1000000000000000;
+               $max_x=-1000000000000000;
+               $min_y=1000000000000000;
+               $max_y=-1000000000000000;
+          
+               foreach($corners as $key => $value) {
+                       if($value[0]<$min_x)
+                               $min_x=$value[0];
+                       if($value[0]>$max_x)
+                               $max_x=$value[0];
+                       
+                       if($value[1]<$min_y)
+                               $min_y=$value[1];
+                       if($value[1]>$max_y)
+                               $max_y=$value[1];
+         }
+       
+               $rotate_width=ceil($max_x-$min_x);
+               $rotate_height=ceil($max_y-$min_y);
+       }
+       else {
+               if ($rot == 180) {
+                       $rotate_height = $src_y;
+                       $rotate_width = $src_x;
+               } else {
+                       $rotate_height = $src_x;
+                       $rotate_width = $src_y;
+               }
+               $bicubic = false;
+       }
+       
+       
+       $rotate=imagecreatetruecolor($rotate_width,$rotate_height);
+       imagealphablending($rotate, false);
+       imagesavealpha($rotate, true);
+       
+       $cosangle = cos($angle);
+       $sinangle = sin($angle);
+   
+       // arrondir pour rotations angle droit (car cos et sin dans {-1,0,1})
+       if ($droit) {
+               $cosangle = round($cosangle);
+               $sinangle = round($sinangle);
+       }
+
+       $newcenter_x = ($rotate_width-1)/2;
+       $newcenter_y = ($rotate_height-1)/2;
+
+   
+       for ($y = 0; $y < $rotate_height; $y++) {
+               for ($x = 0; $x < $rotate_width; $x++) {
+                       // rotate...
+                       $old_x = ((($newcenter_x-$x) * $cosangle + ($newcenter_y-$y) * $sinangle))
+                        + $center_x;
+                       $old_y = ((($newcenter_y-$y) * $cosangle - ($newcenter_x-$x) * $sinangle))
+                        + $center_y;  
+         
+                       $old_x = ceil($old_x);
+                       $old_y = ceil($old_y);
+         
+                       if ( $old_x >= 0 && $old_x < $src_x
+                        && $old_y >= 0 && $old_y < $src_y ) {
+                               if ($bicubic == true) {
+                                       $xo = $old_x;
+                                       $x0 = floor($xo);
+                                       $x1 = ceil($xo);
+                                       $yo = $old_y;
+                                       $y0 = floor($yo);
+                                       $y1 = ceil($yo);
+       
+                                       // on prend chaque point, mais on pondere en fonction de la distance
+                                       $rgb = ImageColorAt($src_img, $x0, $y0); 
+                                       $a1 = ($rgb >> 24) & 0xFF;
+                                       $r1 = ($rgb >> 16) & 0xFF;
+                                       $g1 = ($rgb >> 8) & 0xFF;
+                                       $b1 = $rgb & 0xFF;
+                                       $d1 = _image_distance_pixel($xo, $yo, $x0, $y0);
+                                       
+                                       $rgb = ImageColorAt($src_img, $x1, $y0); 
+                                       $a2 = ($rgb >> 24) & 0xFF;
+                                       $r2 = ($rgb >> 16) & 0xFF;
+                                       $g2 = ($rgb >> 8) & 0xFF;
+                                       $b2 = $rgb & 0xFF;
+                                       $d2 = _image_distance_pixel($xo, $yo, $x1, $y0);
+                                       
+                                       $rgb = ImageColorAt($src_img,$x0, $y1); 
+                                       $a3 = ($rgb >> 24) & 0xFF;
+                                       $r3 = ($rgb >> 16) & 0xFF;
+                                       $g3 = ($rgb >> 8) & 0xFF;
+                                       $b3 = $rgb & 0xFF;
+                                       $d3 = _image_distance_pixel($xo, $yo, $x0, $y1);
+                                       
+                                       $rgb = ImageColorAt($src_img,$x1, $y1);
+                                       $a4 = ($rgb >> 24) & 0xFF;
+                                       $r4 = ($rgb >> 16) & 0xFF;
+                                       $g4 = ($rgb >> 8) & 0xFF;
+                                       $b4 = $rgb & 0xFF;
+                                       $d4 = _image_distance_pixel($xo, $yo, $x1, $y1);
+                                       
+                                       $ac1 = ((127-$a1) / 127);
+                                       $ac2 = ((127-$a2) / 127);
+                                       $ac3 = ((127-$a3) / 127);
+                                       $ac4 = ((127-$a4) / 127);
+
+                                       // limiter impact des couleurs transparentes, 
+                                       // mais attention tout transp: division par 0
+                                       if ($ac1*$d1 + $ac2*$d2 + $ac3+$d3 + $ac4+$d4 > 0) {
+                                               if ($ac1 > 0) $d1 = $d1 * $ac1;
+                                               if ($ac2 > 0) $d2 = $d2 * $ac2;
+                                               if ($ac3 > 0) $d3 = $d3 * $ac3;
+                                               if ($ac4 > 0) $d4 = $d4 * $ac4;
+                                       }
+                                       
+                                       $tot  = $d1 + $d2 + $d3 + $d4;
+
+                                       $r = round((($d1*$r1)+($d2*$r2)+($d3*$r3)+($d4*$r4))/$tot);
+                                       $g = round((($d1*$g1+($d2*$g2)+$d3*$g3+$d4*$g4))/$tot);
+                                       $b = round((($d1*$b1+($d2*$b2)+$d3*$b3+$d4*$b4))/$tot);
+                                       $a = round((($d1*$a1+($d2*$a2)+$d3*$a3+$d4*$a4))/$tot);
+                                       $color = imagecolorallocatealpha($src_img, $r,$g,$b,$a);
+                               } 
+                               else {
+                                       $color = imagecolorat($src_img, round($old_x), round($old_y));
+                               }
+                       }
+                       else {
+                               // this line sets the background colour
+                               $color = imagecolorallocatealpha($src_img, 255, 255, 255, 127);
+                       }
+                       @imagesetpixel($rotate, $x, $y, $color);
+               }
+       }
+       return $rotate;
+}
+
+// permet de faire tourner une image d'un angle quelconque
+// la fonction "crop" n'est pas implementee...
+// http://doc.spip.org/@image_rotation
+function image_rotation($im, $angle, $crop=false)
+{
+       $fonction = array('image_rotation', func_get_args());
+       $image = _image_valeurs_trans($im, "rot-$angle-$crop", "png", $fonction);
+       if (!$image) return("");
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               $effectuer_gd = true;
+
+               if(is_callable(array('Imagick','rotateImage'))){
+                       $imagick = new Imagick();
+                       $imagick->readImage($im);
+                       $imagick->rotateImage(new ImagickPixel('none'), $angle);
+                       $imagick->writeImage($dest);
+                       $effectuer_gd = false;
+               }
+               else if ($GLOBALS['meta']['image_process'] == "convert") {
+                       if (_CONVERT_COMMAND!='') {
+                               @define ('_CONVERT_COMMAND', 'convert');
+                               @define ('_ROTATE_COMMAND', _CONVERT_COMMAND.' -background none -rotate %t %src %dest');
+                       } else
+                               @define ('_ROTATE_COMMAND', '');
+                       if (_ROTATE_COMMAND!=='') {
+                               $commande = str_replace(
+                                       array('%t', '%src', '%dest'),
+                                       array(
+                                               $angle,
+                                               escapeshellcmd($im),
+                                               escapeshellcmd($dest)
+                                       ),
+                                       _ROTATE_COMMAND);
+                               spip_log($commande);
+                               exec($commande);
+                               if (file_exists($dest)) // precaution
+                                       $effectuer_gd = false;
+                       }
+               }
+               // cette variante genere-t-elle un fond transparent
+               // dans les coins vide issus de la rotation ?
+               elseif (function_exists('imagick_rotate')) {
+                       $handle = imagick_readimage ($im);
+                       if ($handle && imagick_isopaqueimage( $handle )) {
+                               imagick_setfillcolor($handle, 'transparent');
+                               imagick_rotate( $handle, $angle);
+                               imagick_writeimage( $handle, $dest);
+                               $effectuer_gd = false;
+                       }
+               }
+               if ($effectuer_gd) {
+                       // Creation de l'image en deux temps
+                       // de facon a conserver les GIF transparents
+                       $im = $image["fonction_imagecreatefrom"]($im);
+                       imagepalettetotruecolor($im);
+                       $im = image_RotateBicubic($im, $angle, true);
+                       _image_gd_output($im,$image);
+                       imagedestroy($im);
+               }
+       }
+       list ($src_y,$src_x) = taille_image($dest);
+       return _image_ecrire_tag($image,array('src'=>$dest,'width'=>$src_x,'height'=>$src_y));
+}
+
+// Permet d'appliquer un filtre php_imagick a une image
+// par exemple: [(#LOGO_ARTICLE|image_imagick{imagick_wave,20,60})]
+// liste des fonctions: http://www.linux-nantes.org/~fmonnier/doc/imagick/
+// http://doc.spip.org/@image_imagick
+function image_imagick () {
+       $tous = func_get_args();
+       $img = $tous[0];
+       $fonc = $tous[1];
+       $tous[0]="";
+       $tous_var = join($tous, "-");
+
+       $fonction = array('image_imagick', func_get_args());
+       $image = _image_valeurs_trans($img, "$tous_var", "png",$fonction);
+       if (!$image) return("");
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               if (function_exists($fonc)) {
+
+                       $handle = imagick_readimage ($im);
+                       $arr[0] = $handle;
+                       for ($i=2; $i < count($tous); $i++) $arr[] = $tous[$i];
+                       call_user_func_array($fonc, $arr);
+                       // Creer image dans fichier temporaire, puis renommer vers "bon" fichier
+                       // de facon a eviter time_out pendant creation de l'image definitive
+                       $tmp = preg_replace(",[.]png$,i", "-tmp.png", $dest);
+                       imagick_writeimage( $handle, $tmp);
+                       rename($tmp, $dest);
+                       ecrire_fichier($dest.".src",serialize($image));
+               } 
+       }
+       list ($src_y,$src_x) = taille_image($dest);
+       return _image_ecrire_tag($image,array('src'=>$dest,'width'=>$src_x,'height'=>$src_y));
+
+}
+
+// Permet de rendre une image
+// plus claire (gamma > 0)
+// ou plus foncee (gamma < 0)
+// http://doc.spip.org/@image_gamma
+function image_gamma($im, $gamma = 0){
+       include_spip('filtres/images_lib');
+       $fonction = array('image_gamma', func_get_args());
+       $image = _image_valeurs_trans($im, "gamma-$gamma",false,$fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               // Creation de l'image en deux temps
+               // de facon a conserver les GIF transparents
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+               $color_t = ImageColorAllocateAlpha( $im_, 255, 255, 255 , 127 );
+               imagefill ($im_, 0, 0, $color_t);
+               imagecopy($im_, $im, 0, 0, 0, 0, $x_i, $y_i);
+       
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y=0; $y < $y_i; $y++) {
+                               $rgb = ImageColorAt($im_, $x, $y);
+                               $a = ($rgb >> 24) & 0xFF;
+                               $r = ($rgb >> 16) & 0xFF;
+                               $g = ($rgb >> 8) & 0xFF;
+                               $b = $rgb & 0xFF;
+
+                               $r = _image_decale_composante($r, $gamma);
+                               $g = _image_decale_composante($g, $gamma);
+                               $b = _image_decale_composante($b, $gamma);
+
+                               $color = ImageColorAllocateAlpha( $im_, $r, $g, $b , $a );
+                               imagesetpixel ($im_, $x, $y, $color);                   
+                       }
+               }
+               _image_gd_output($im_,$image);
+       }
+       return _image_ecrire_tag($image,array('src'=>$dest));
+}
+
+// Passe l'image en "sepia"
+// On peut fixer les valeurs RGB 
+// de la couleur "complementaire" pour forcer une dominante
+//function image_sepia($im, $dr = 137, $dv = 111, $db = 94)
+// http://doc.spip.org/@image_sepia
+function image_sepia($im, $rgb = "896f5e"){
+       include_spip('filtres/images_lib');
+       
+       if (!function_exists("imagecreatetruecolor")) return $im;
+       
+       $couleurs = _couleur_hex_to_dec($rgb);
+       $dr= $couleurs["red"];
+       $dv= $couleurs["green"];
+       $db= $couleurs["blue"];
+               
+       $fonction = array('image_sepia', func_get_args());
+       $image = _image_valeurs_trans($im, "sepia-$dr-$dv-$db",false,$fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               // Creation de l'image en deux temps
+               // de facon a conserver les GIF transparents
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+               $color_t = ImageColorAllocateAlpha( $im_, 255, 255, 255 , 127 );
+               imagefill ($im_, 0, 0, $color_t);
+               imagecopy($im_, $im, 0, 0, 0, 0, $x_i, $y_i);
+       
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y=0; $y < $y_i; $y++) {
+                               $rgb = ImageColorAt($im_, $x, $y);
+                               $a = ($rgb >> 24) & 0xFF;
+                               $r = ($rgb >> 16) & 0xFF;
+                               $g = ($rgb >> 8) & 0xFF;
+                               $b = $rgb & 0xFF;
+
+                               $r = round(.299 * $r + .587 * $g + .114 * $b);
+                               $g = $r;
+                               $b = $r;
+
+
+                               $r = _image_decale_composante_127($r, $dr);
+                               $g = _image_decale_composante_127($g, $dv);
+                               $b = _image_decale_composante_127($b, $db);
+
+                               $color = ImageColorAllocateAlpha( $im_, $r, $g, $b , $a );
+                               imagesetpixel ($im_, $x, $y, $color);                   
+                       }
+               }
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+       }
+       
+       return _image_ecrire_tag($image,array('src'=>$dest));
+}
+
+
+// Renforcer la nettete d'une image
+// http://doc.spip.org/@image_renforcement
+function image_renforcement($im, $k=0.5)
+{
+       $fonction = array('image_flou', func_get_args());
+       $image = _image_valeurs_trans($im, "renforcement-$k",false,$fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       $creer = $image["creer"];
+       
+       if ($creer) {
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               @imagealphablending($im_, false);
+               @imagesavealpha($im_,true);
+               $color_t = ImageColorAllocateAlpha( $im_, 255, 255, 255 , 127 );
+               imagefill ($im_, 0, 0, $color_t);
+
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y=0; $y < $y_i; $y++) {           
+
+                $rgb[1][0]=imagecolorat($im,$x,$y-1);
+                $rgb[0][1]=imagecolorat($im,$x-1,$y);
+                $rgb[1][1]=imagecolorat($im,$x,$y);
+                $rgb[2][1]=imagecolorat($im,$x+1,$y);
+                $rgb[1][2]=imagecolorat($im,$x,$y+1);
+                
+                
+                if ($x-1 < 0) $rgb[0][1] = $rgb[1][1];
+                if ($y-1 < 0) $rgb[1][0] = $rgb[1][1];
+                if ($x+1 == $x_i) $rgb[2][1] = $rgb[1][1];
+                if ($y+1 == $y_i) $rgb[1][2] = $rgb[1][1];
+
+                $a = ($rgb[1][1] >> 24) & 0xFF;
+                $r = -$k *(($rgb[1][0] >> 16) & 0xFF) +
+                         -$k *(($rgb[0][1] >> 16) & 0xFF) +
+                        (1+4*$k) *(($rgb[1][1] >> 16) & 0xFF) +
+                         -$k *(($rgb[2][1] >> 16) & 0xFF) +
+                         -$k *(($rgb[1][2] >> 16) & 0xFF) ;
+
+                $g = -$k *(($rgb[1][0] >> 8) & 0xFF) +
+                         -$k *(($rgb[0][1] >> 8) & 0xFF) +
+                         (1+4*$k) *(($rgb[1][1] >> 8) & 0xFF) +
+                         -$k *(($rgb[2][1] >> 8) & 0xFF) +
+                         -$k *(($rgb[1][2] >> 8) & 0xFF) ;
+
+                $b = -$k *($rgb[1][0] & 0xFF) +
+                         -$k *($rgb[0][1] & 0xFF) +
+                        (1+4*$k) *($rgb[1][1] & 0xFF) +
+                         -$k *($rgb[2][1] & 0xFF) +
+                         -$k *($rgb[1][2] & 0xFF) ;
+
+                $r=min(255,max(0,$r));
+                $g=min(255,max(0,$g));
+                $b=min(255,max(0,$b));
+
+
+               $color = ImageColorAllocateAlpha( $im_, $r, $g, $b , $a );
+               imagesetpixel ($im_, $x, $y, $color);                   
+                       }
+               }               
+               _image_gd_output($im_,$image);
+       }
+
+       return _image_ecrire_tag($image,array('src'=>$dest));
+}
+
+
+
+
+// 
+// alpha = 0: aucune transparence
+// alpha = 127: completement transparent
+/**
+ * Transforme la couleur de fond de l'image en transparence
+ * Le filtre ne g�re pas la notion de contiguite aux bords, et affectera tous les pixels de l'image dans la couleur visee
+ * $background_color : couleur cible
+ * $tolerance : distance L1 dans l'espace RGB des couleur autour de la couleur $background_color pour lequel la transparence sera appliquee
+ * $alpha : transparence a appliquer pour les pixels de la couleur cibles avec la tolerance ci-dessus
+ * $coeff_lissage : coeff applique a la tolerance pour determiner la decroissance de la transparence fonction de la distance L1 entre la couleur du pixel et la couleur cible
+ *
+ * @param string $im
+ * @param string $background_color
+ * @param int $tolerance
+ * @param int $alpha
+ * @param float $coeff_lissage
+ * @return string
+ */
+function image_fond_transparent($im, $background_color, $tolerance=12, $alpha = 127, $coeff_lissage=7)
+{
+       $fonction = array('image_fond_transparent', func_get_args());
+       $image = _image_valeurs_trans($im, "fond_transparent-$background_color-$tolerance-$coeff_lissage-$alpha", "png", $fonction);
+       if (!$image) return("");
+       
+       $x_i = $image["largeur"];
+       $y_i = $image["hauteur"];
+       
+       $im = $image["fichier"];
+       $dest = $image["fichier_dest"];
+       
+       $creer = $image["creer"];
+       
+       if (true OR $creer) {
+               $bg = _couleur_hex_to_dec($background_color);
+               $bg_r = $bg['red'];
+               $bg_g = $bg['green'];
+               $bg_b = $bg['blue'];
+       
+               // Creation de l'image en deux temps
+               // de facon a conserver les GIF transparents
+               $im = $image["fonction_imagecreatefrom"]($im);
+               imagepalettetotruecolor($im);
+               $im2 = imagecreatetruecolor($x_i, $y_i);
+               @imagealphablending($im2, false);
+               @imagesavealpha($im2,true);
+               $color_t = ImageColorAllocateAlpha( $im2, 255, 255, 255 , 127 );
+               imagefill ($im2, 0, 0, $color_t);
+               imagecopy($im2, $im, 0, 0, 0, 0, $x_i, $y_i);
+
+               $im_ = imagecreatetruecolor($x_i, $y_i);
+               imagealphablending ($im_, FALSE );
+               imagesavealpha ( $im_, TRUE );
+               $color_f = ImageColorAllocateAlpha( $im_, 255, 255, 255 , $alpha );
+
+               for ($x = 0; $x < $x_i; $x++) {
+                       for ($y = 0; $y < $y_i; $y++) {
+                               $rgb = ImageColorAt($im2, $x, $y);
+                               $r = ($rgb >> 16) & 0xFF;
+                               $g = ($rgb >> 8) & 0xFF;
+                               $b = $rgb & 0xFF;
+                               if ((($d=abs($r-$bg_r)+abs($g-$bg_g)+abs($b-$bg_b))<=$tolerance)){
+                                       imagesetpixel ( $im_, $x, $y, $color_f );
+                               }
+                               elseif ($tolerance AND $d<=($coeff_lissage+1)*$tolerance){
+                                       $transp = round($alpha*(1-($d-$tolerance)/($coeff_lissage*$tolerance)));
+                                       $color_p = ImageColorAllocateAlpha( $im_, $r, $g, $b , $transp);                                        
+                                       imagesetpixel ( $im_, $x, $y, $color_p );
+                               }
+                               else
+                                       imagesetpixel ( $im_, $x, $y, $rgb );
+                       }
+               }
+               _image_gd_output($im_,$image);
+               imagedestroy($im_);
+               imagedestroy($im);
+               imagedestroy($im2);
+       }
+       
+       return _image_ecrire_tag($image,array('src'=>$dest));
+}
+?>