iGamma for Windows

The description of iGamma - Play With New Friends

iGamma allows you to easily change the brightness levels for your favorite games. You can set up profiles for each seperate game you have, and designate different brightness levels for each game. This software automatically detects when your game launches, and changes the brightness level accordingly! Unlike other programs which require you to launch your game from inside the gamma application, iGamma will automatically do everything for you. It will even work with your favorite game launchers, such as GameSpy.