: Can I blend layers by formula with brackets? I have 4 layers (A, B, C, D) which I wish to blend by the following formula (A xor B) plus (C xor D). Is it possible to accomplish this in
I have 4 layers (A, B, C, D) which I wish to blend by the following formula (A xor B) plus (C xor D). Is it possible to accomplish this in Photoshop? I am a newbie and found that layer can only control it's blending with all underlying ones.
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Maybe. Sort of.
The maths for blending modes probably doesn't fit exactly what you're after. Difference is the same as XOR, and I think Screen the closest you'll get to addition.
Screen Blending Mode
Difference Blending Mode
You should be able to set up the compositing you're after by setting a group blending mode.
If you're after specific and precise values as a result, you may be better served by using something else (or writing your own little application in a high level language).
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