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So Photobooth has this kind of makeshift green screen technology that involves stepping out of the frame, getting back in, and then Photobooth works out the difference.

I was wondering if it were possible to use that technology in anyway with a prerecorded video. Basically I have a video shot against a plain white background, and I wanna play around with changing it. I do have a shot of just the white background by itself. If it were shot against green or blue I could use iMovie, but unfortunately that's not the case.

I don't think either Photobooth or iMovie can do this on its own, but since the technology basically already exists in Photobooth I'm thinking there must be a way to do this (with maybe another app?)

note: I know you can do stuff like this in Final Cut Pro, but I'm looking for a free or at least relatively cheap solution.

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I don't know of a specific app to point you to, but maybe you and Google can work something out knowing it's called a "chroma key" or "chroma keying." –  iynque Jul 30 '12 at 2:07
    
thank you very much! I had no idea how to google my question effectively so this really helped. –  Kirby Jul 30 '12 at 2:12

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