Core Graphics   >     CGBlendMode   >   plusDarker
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plusDarker
R = MAX(0, 1 - ((1 - D) + (1 - S)))
XCode 8.2 日本語化計画:Core Graphics CGBlendMode
Core Graphics   >     CGBlendMode   >   plusDarker
R = MAX(0, 1 - ((1 - D) + (1 - S)))