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multiply mode
Description:
Both parameters are simply multiplied by each other. This returns a darker result than both input parameters in most cases (except one of them equals 1). Completely white layers do not change the background at all (and vice versa) - completely black layers give a black result.

Formula:
f(a,b) = a * b



Advantage:
This mode is commutative (base and blend color can be swapped).

Code:
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