Result of alpha composition

Result of alpha composition

Hello,

I'm using AlphaComp_8uAC4R function. I want to be able to work in both modes : alpha-premultiplied mode and not premultiplied mode.
From my tests, it seems that the results of the function with ippAlphaOver are alpha-premultiplied :
I've the same results with
AlphaPremul(im1);
AlphaPremul(im2);
AlphaComp(im1,im2,ippAlphaOverPremul)
and
AlphaComp(im1,im2,ippAlphaOver)

Is it the expected behaviour ?
Is there a inverse function for AlphaPremul I could use to transform the result ?

Thanks

Raphael

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