>   When I render the example scene without +ua, all parts of the the text
is
> antialiased equally.
>   If I render it with +ua (and antialiasing method 1), then the part of
the
> text which has only background behind it doesn't get antialiased (while
the
> part which has the boxes behind does). The preview of POV-Ray shows
clearly
> this and when I open the resulting image with Gimp, it is identical (that
is,
> the edges really aren't antialiased in those parts).

This is why I've overlapped the text with the checkered boxes

>   I'm using the unix version (yes, it supports preview taking into account
> the alpha channel, as the Windows version does), but I suppose that the
Windows
> version works in the same way (I suppose that the original poster is using
> that).

I use Windows, which when +UA is on makes the checkered background of the
preview window visible trough the transparent pixels of the image.

>   However, I think the problem seems to be somewhere else. I tried putting
> another black object in the image (a cylinder) and it didn't get
antialiased in
> the lower half of the image either.
>   It seems to me that the color of the objects has something to do with
this.
> If I make the cylinder and the text red, then they get antialiased.
>
>   Could it perhaps be that the antialiasing routine thinks that the
background
> is black and thus doesn't perform antialiasing with black objects?
>   This is specially curious since the background is specifically set to
white.

I agree with you, maybe is something related to the way POV promote the
three component color used for background directive into the internal five
component format.

Alessandro

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