assertSame() is guaranteed to not do any type conversion. This can be
critical when acciden tially comparing, for example, 0 to 0.0.
Change-Id: Iffcc9bda69573623ba14af655dcd697d0fcce525
* 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
