Crap. I don't know why that happened. Sorry.

I'm "on the road" and have no Poser or Photoshop with me. I'll have to check this out when I get back on Friday.

You're probably doing nothing wrong. It looks to me like the render was already pre-multiplied, but PSP is not taking that into account, and is multiplying the fringe pixels with the alpha channel. This results in double darkening of the skin color.

When I return home, I'll produce a a test image programmatically where I know what numerical values are in those pixels. Then I'll see how it  comps in Photoshop. I'll post the image and you can try comping it in PSP.

Right now, it looks like it doesn't matter at all what you render over, PSP comps it wrong.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)