> The alpha channel, as POV interprets it, is an additional channel in the
image
> which represents the amount of "presense" in a pixel. The background
> (or sky_sphere) get a 0 and a direct hit in an object gets 255.
> Antialiasing does its job here, too, so anything in between 0 and 255
> will happen on the edges of objects, which you find problematic.

So do pixels with a partial alpha channel (such as those on the edge of an
object) contain any colour from the background or skysphere?

I am about to create a tool that fixes the images I want from PNGs, so I
need to know if I can treat all non-zero alpha's as 255.

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