http://bugs.winehq.org/show_bug.cgi?id=12453
--- Comment #101 from Tobias Jakobi liquid.acid@gmx.net 2011-02-16 18:35:54 CST --- I don't know if this was posted here already, but this (upcoming?) GL extension could solve the sRGB dilemma: http://www.opengl.org/registry/specs/EXT/texture_sRGB_decode.txt
Some mesa drivers seem to implement this already, however AFAIK wine doesn't to use it yet.