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Multiply blend is broken in 32 bpc

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Photo and Designer, retail and current betas.


Multiply blending is broken in 32 bpc mode.

Something like the following seems to be happening:

for each channel, whichever of the multiplicand and multiplier is the greater, it is clamped to a max of 1.0 before the multiplication.


Of course,the bug will not be evident when neither multiplicand nor multiplier exceeds 1.0, but it can prevent correct compositing of HDR rendering passes such as multiplying a base colour pass by an illumination pass.


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