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overlay mode
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Description:
A combination of screen and multiply mode, depending on the base color.
Formula:
| f(a,b) = |
2ab (for a < ½) |
| 1 - 2 * (1 - a) * (1 - b) (else) |
Disadvantage:
There is a separate formula for bright and for dark base colors,
so there is a discontinuance for a = ½ (diagram 1 can be sparated into two parts).
Code:
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