Manual:$wgUseTinyRGBForJPGThumbnails

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ImageMagick: $wgUseTinyRGBForJPGThumbnails
Swaps JPGs that use sRGB ICC profile with TinyRGB profile
Introduced in version:1.26.0 (Gerrit change 218372; git #584a2393)
Removed in version:still in use
Allowed values:(boolean)
Default value:false

Details[edit]

When this variable is true and JPGs use the sRGB ICC profile, swaps it for the more lightweight (and free) TinyRGB profile when generating thumbnails.