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If your webcam is dark or has color-balance problems, i Glasses can correct and help compensate for many image quality issues.
There's several other Mac webcam effects and image apps worth checking out as well, notably Mactaris' Mac webcam app utility downloadable from the Apple App Store. If your processor is a G4 or greater, if it's speed is 867mhz or faster, that's the point where Apple built-in USB 2 speed ports. In Apple System Profiler Device Tree -- USB 2.0 devices listed need to show "Speed: 480Mb/sec".
One Apple compatible webcam effects and image adustment solution is a app called i Glasses from
It also provides alot of webcam effects to play with.