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Solid Composite, CC Composite, Arithmetics, Channel Mixer. Plenty to choose from. Most of them will just require a suitable second layer in the comp to be used as input.
Thank you for quick answer.
Arithmetic almost works, but it's missing a normal mode. I would like to be able to switch between normal and add mode. A effect that will need a second layer is not a good solution for me in this case. Yes, I know, but it will take me a long time to explain why.
Did you try CC Composite? It should do exactly what you need.
It does kind of. But opposite. It might actually work for me. Thanks both of you.