Am 27.10.2010 16:47, schrieb Mr:

> The closest workaround I found:
> using transmit 0.99 for the background-like entry of the sky sphere I have the
> behaviour I want for transparency with gradient. only problem remaining is when
> user selects no sky spher I let background with transmit 1 do the job, but the
> anti aliasing is white. if I put transmit 0.99 in bacground color, AA is
> perfect, but then color is slightly off.

You should be able to use values even closer to 1.0, which will reduce 
the impact on color.

There is no sane way for a general fix; even a full redesign of 
POV-Ray's internal maths to operate on non-premultiplied values would 
not be a viable solution, as this would in turn cause problems when 
working with emissive media: Non-premultiplied values can't represent 
light to be /added/ to a fully transparent background.

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