X-Git-Url: https://git.cyclocoop.org/%28%28?a=blobdiff_plain;f=includes%2FDefaultSettings.php;h=5b3684b3364f679f13e929db6408ab87b6c45931;hb=a30bc4f7e0b8a2d310217741dc41f76129c26019;hp=13f7c4ef88efce9b873839e2b600d78c5f522c46;hpb=32e56eefaa1d9c0a832f9e32db4f9bdaad28f02e;p=lhc%2Fweb%2Fwiklou.git

diff --git a/includes/DefaultSettings.php b/includes/DefaultSettings.php
index 13f7c4ef88..5b3684b336 100644
--- a/includes/DefaultSettings.php
+++ b/includes/DefaultSettings.php
@@ -980,6 +980,27 @@ $wgCustomConvertCommand = false;
  */
 $wgJpegTran = '/usr/bin/jpegtran';
 
+/**
+ * At default setting of 'yuv420', JPEG thumbnails will use 4:2:0 chroma
+ * subsampling to reduce file size, at the cost of possible color fringing
+ * at sharp edges.
+ *
+ * See https://en.wikipedia.org/wiki/Chroma_subsampling
+ *
+ * Supported values:
+ *   false - use scaling system's default (same as pre-1.27 behavior)
+ *   'yuv444' - luma and chroma at same resolution
+ *   'yuv422' - chroma at 1/2 resolution horizontally, full vertically
+ *   'yuv420' - chroma at 1/2 resolution in both dimensions
+ *
+ * This setting is currently supported only for the ImageMagick backend;
+ * others may default to 4:2:0 or 4:4:4 or maintaining the source file's
+ * sampling in the thumbnail.
+ *
+ * @since 1.27
+ */
+$wgJpegPixelFormat = 'yuv420';
+
 /**
  * Some tests and extensions use exiv2 to manipulate the Exif metadata in some
  * image formats.