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Seems like a negative node after the alpha would do the same thing as 1-alpha using a Logic Op to subtract.
I think John was emphasizing the math involved.
And please, can we log this as a feature request as mentioned earlier in the thread. Receiving graphics premultiplied on white happens all too often, and confuses many who dont know how to deal with it. Then they end up shrinking the matte or doing something else which compromises the intended look of the graphic.
Is there a fix for that in Smoke 2017?
having the same problem with white background and can't figure out a work around.
thanks
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