Most functions use a blending mode of over (X=1,Y=1,Z=1) this results in
the following optimizations...
gamma = Sa+Da-Sa*Da;
- gamma = 1 - QuantiumScale*alpha * QuantiumScale*beta;
- opacity = QuantiumScale*alpha*beta; // over blend, optimized 1-Gamma
+ gamma = 1 - QuantumScale*alpha * QuantumScale*beta;
+ opacity = QuantumScale*alpha*beta; // over blend, optimized 1-Gamma
- The above SVG definitions also definate that Mathematical Composition
+ The above SVG definitions also define that Mathematical Composition
methods should use a 'Over' blending mode for Alpha Channel.
It however was not applied for composition modes of 'Plus', 'Minus',
the modulus versions of 'Add' and 'Subtract'.