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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.Selecting which cam to use is done within the programs Video Settings...similar to switching audio input sources between a built-in, external, or a Bluetooth headset. Trying to run Photo Booth, Skype or i Chat and perhaps another video app simultaneously - One app will put your webcam 'in use.' If And When you initiate a video call - the other app(s) can't share that.Photobooth can be VERY FINICKY about dealing with multiple cams on a Mac Book, i Mac or Cinema Display with built-in i Sight.Newer versions of Photo Boooth do allow selecting your camera input choice from the CAMERA menu.Apple intentionally does not allow external USB Mac webcams to be selected as a video source in i Move. Try a special hack from Mactaris that allows i Move to 'see' an external 3rd-party web camera.Otherwise you'll simply need to record your video with some other Quick Time compatible video capture app - then bring it into i Movie for editing.
Launch i Chat, open your Video Preview window to put the i Sight in-use. Simply Put: Your webcam may have a very very hi-res HD sensor.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".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.
Or it's the fact that you simply CANNOT BLAST 30FPS of High-Definition 720p or 1080p HD image data over a slow DSL or Cable modem connection, Period. Your expectations about webcam frame-rate may not be realistic.
Sometimes just canceling one app's video call & switching works, sometimes you have to Quit competing video apps and relaunch.