Adjusting colour saturation in OS X

Adjusting display colour saturation in OS X Is there a way to globally adjust the colour saturation of displays in Mac OS 10.5.8? I know it can be done in various applications such as DVD Player and QuickTime Player, but it's a hassle to have to do it for each individual title I watch. I've tried calibrating it using the Displays control panel, but that seems to cover everything but saturation. Do I need some kind of third-party doohickey, or am I missing something?