http://bugs.winehq.org/show_bug.cgi?id=29599
--- Comment #1 from Henri Verbeet hverbeet@gmail.com 2012-01-14 08:22:07 CST --- (In reply to comment #0)
I tried to take screenshots of the problem, but interestingly, the brightness of the screenshots is correct, and every detail on the screenshots is visible.
Yeah, that's expected. Gamma correction wouldn't affect pixel RGB values, just what's sent to the monitor.