[Cin] Color erase like GIMP

[Stefan de Konink]

On Monday, September 27, 2021 10:45:55 AM CEST, Igor BEGHETTO via Cin 
wrote:
> It seems pretty good. For you, is it the right way?

I got it to work under FFmpeg as well, code quality is still subpar... but 
in general I would love to have thing thing natively in Cinerella as well. 
The variant with a single color make sense, but also subtracting another 
layer.

<https://github.com/skinkie/FFmpeg/commit/7683c206446661e04bfc34b0149cbcf4c19a3d55#diff-30bbbdaad37f440707bda666ec8c00a0c3d6812cc62a54a873bcb16ea7487bd3R690>

-- 
Stefan
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