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average mode
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Description:
Most programs don't support this mode, because the normal mode returns the same result,
when opacity is set to 50% (see below), but I explain it here at the beginning because it is a very basic mode.
It is also similar to additive and subtractive mode (see below).
Formula:
f(a,b) = (a + b) / 2
Advantage:
This mode is commutative (base and blend color can be swapped).
Code:
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