"Thorsten Froehlich" <tho### [at] trfde> wrote in message
news:40f57c01@news.povray.org...
> In article <40f578b0$1@news.povray.org> , "Hughes, B."
> <bob### [at] charternet> wrote:
>
> > In the image you'll see a glassy blob object with a gray background
plane. I
> > tried sky_sphere and background {}, with similar results, if the AA
> > threshold is 0.1 or lower. AA values typed onto the two examples. Once
the
> > AA value is high enough the blocky artifact will disappear. Apparently
gamma
> > related somehow.
>
> If you post an image to show artifacts, you should really not use a lossy
> image format.  Please post this again as PNG, with JPEG it is impossible
to
> tell what you are talking about and what are just JPEG artifacts.
>
> If possible, please mark the problem in the image as well.
>
>     Thorsten

having experienced this (or very similar) anomoly i can tell you that the
light grey area on the right and lower right is the artifact. my image also
had a lighter area to the right of an object which went away with different
+A value and or by setting +AM2

hope this helps a little.

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