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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.
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".
Other reasons: Your computer may not be fast enough. There's a reason why almost all video chat/conferencing programs send smaller frames of video at 1/8 or 1/4 screen size: It's all that current affordble consumer technology and home data bandwidth can handle.
There's an old saying: You can't fit an elephant in your back pocket.
And unfortunately, Apple doesn't have a Webcam Preference Pane in OSX.
The single best thing you can do that doesn't need any Mac webcam app at all is to improve your room lighting so the camera doesn't have to struggle under inadequate light.
Newer versions of Photo Boooth do allow selecting your camera input choice from the CAMERA menu.Several companies such as Rocket Fish, HP, and Microsoft have 1 or more buttons on the camera to save an image snap to disk, send to email, or possibily to a printer.However, only Windows software has ever been written to support them. i Movie is only designed to work with a i Sight on an i Mac or Mac Book - or a Fire Wire DV camera source.They may or may not actively use chat programs, but at least this is a starting point.Many social networking and adult profile sites often have webcam chat rooms you can join if you so choose. It's the most fully featured Mac/PC Cross-Platform webchat experience available. It has both G-rated and X-rated rooms to visit, online member status and more. It offers a built-in community you can browse & optionally connect with.
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You may have to launch, relaunch Photoboth, un-plug, re-plug your external Mac web cam to get Photobooth to recognize it, but it's doable. But it's the video capture or chat programs you use often can't take advantage of it.