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. 

On Mon, Apr 20, 2009 at 3:34 PM, Hans-Christoph Steiner <hans@at.or.at> wrote:

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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