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The edges look strange because I forget to render with the correct background color when transparency is involved. Or put differently, because Poser does something not quite correct with the alpha channel.

Transparency? Isn't that strand-based dynamic hair? Why would transparency have anything to do with it?

Sorry, not transparency as such. It's fine details at the outline of the render that got mixed with the original background color via anti-aliasing. When one saves a render with an alpha mask that shouldn't happen, but it does.

-- I'm not mad at you, just Westphalian.