a30bc4f7e0
* Add $wgJpegPixelFormat, default to 'yuv420' * Implemented for ImageMagick via CLI and extension * Currently ignored for other scaler backends * Added test case to run when using ImageMagick 4:2:0 subsampling can save an average of 17% bandwidth over 4:4:4 subsampling, at the cost of some artifacting at sharp red or blue edges. This is usually not noticeable in photographic images. To restore the previous behavior, set to false: $wgJpegPixelFormat = false; which will maintain the original file's pixel subsampling settings in the thumbnail. Can set explicitly to one of: 'yuv444' - never subsample 'yuv422' - subsample 2x horizontally, not vert 'yuv420' - subsample 2x in both dimensions Bug: T129128 Change-Id: Ib9cb36c3a7e6a69d66c11150ef4a1d02dbac2df5 |
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