My 2p would be that pre-multiplied alpha is a very useful optimisation for
compositing, but a hindrance for everything else.
Perhaps you could move your colour management after the compositing step?
So have RGBA with pre-multipled alpha as your working space, composite down
to a single plain RGB layer for painting to the screen, and do a final pass
with lcms on that, just before sending it out.
Compositing device-space images seems possibly questionable anyway. Won't
things like gamma, which you won't have control over, affect the result?
John
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