Screen tinted blue when playing game - Mac OS X?

[ashton]

Whenever I play a game, my screen tints blue. But it's only when the game is the active window- if it isn't, everything (including the game) looks fine.

I tried to take a screenshot, but the screenshot looks just like how it does when it's not active- that is, not tinted in blue. What gives?

It makes the whole game look worse. How do I fix this? I'm on a macbook pro.