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is there a program that makes greenscreen effects as a webcam is rolling? see description for more details.

if this seem confusing, i simply mean that you take a webcam, connect it, and it automaticly scans the webcam'e view for green screen green, and it replaces it with the selected image/video. got it? still confused? then post ?s and i'll try to answer them.

Sure, give this a look. If that doesn't work for you, a quick Google for "webcast chroma-key software" should turn up a few more results.