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Non linear blending - How to?

Hey Community,

I want do blend two images non linear. AddWeighted can only blend two images linear. I am looking for something like this:

non linear blending


The best would be, if I could use my own mask for that. I thought to use a alpha mask (explained here) but I donĀ“t know how to get back to rgb and blend again..

Anyone an idea? Thanks in advance!