is deprecated.
* (T33313) Add a preference for watching uploads by default, also applies
to API-based upload tools.
+* $wgJpegPixelFormat was added to override chroma subsampling for JPEG image
+ thumbnails created via ImageMagick. Defaults to 'yuv420', providing bandwidth
+ savings versus the previous behavior on many files.
=== External library changes in 1.27 ===
* Skin::tooltipAndAccesskeyAttribs was removed (deprecated since 1.21).
* Skin::userTalkLink was removed (deprecated since 1.21).
* Skin::userToolLinksRedContribs was removed (deprecated since 1.21).
+* wikidiff3 is now the default and only PHP diff engine. It provides improved diff
+ performance on complex changes. $wgExternalDiffEngine = 'wikidiff3' therefore
+ makes no difference now. Users are still recommended to use wikidiff2 if possible,
+ though.
== Compatibility ==