[PD] chroma_key to alpha with Gem?

[Claude Heiland-Allen]

Hans-Christoph Steiner 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.

Maybe use a GLSL fragment shader to do the colour to alpha mangling? 
Should be superfast on a recent GPU with supporting drivers...


Claude
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