[PD] chroma_key to alpha with Gem?

chris clepper cgclepper at gmail.com
Mon Apr 20 21:55:23 CEST 2009

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 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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