Not sure if this will work for you ... but with the construct in the material library there is a "blackout" setting. I'm guessing here, but this could do the effect you are looking for. Hmmm. Since it uses a construct setting I'm thinking this won't work for your purposes BUT I believe there is a process to do this. I just don't know what it is. It's late here, so give me some time, I think I did read somewhere how you can blend colors from a background image to the foreground figures. I will look into this tomorrow.

Boni

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"Be Hero to Yourself" -- Peter Tork