I have done a lot of this type of processing with a shader. Just pick the color in the desired range and set the alpha of a pixel in that range to 0. After that just lay the video on top of each other.
I was wondering whether it is possible convert a specific color, like green-screen chroma key, to alpha information using Gem. They idea is to overlap many green-screen videos. I can see the pieces, but I can't see the whole.
.hc
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Man has survived hitherto because he was too ignorant to know how to realize his wishes. Now that he can realize them, he must either change them, or perish. -William Carlos Williams
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