I'm using P7 as well. I almost always render with ray-tracing and smooth polygons on.

I'm rendering some test images right now to illustrate my problem.

Could it be the post filter you're thinking about? I always leave that at the default (box, 1). I made a test, setting it to 3, which made the white halo/outline more obvious, but as you can't set it to 0 or turn it off otherwise (that I can see), I don't know...

The test below shows my predicament. It's been rendered in P7 with a white background color, then exported as a .psd, brought into Photoshop (CS2), where I selected the alpha layer (holding CTRL down and selecting it, then going back in the layers mode and copying the selection from the Background layer onto a new layer and then inserting a black layer in between to show what happens).

Is my method of selecting the alpha layer where I mess up? Maybe I'm doing that step wrong.

Anyways, here's the image:

Thanks again for the time!

(Sorry for hijacking the thread Sturkwurk, I'll start a new thread soon, but it seemed relevant somehow hehe).