My gamma_correct solution may be flawed.  I'll look into it further and let
you know.  The focal_blur solution is correct.  It is the anti-aliasing ones
that do not work properly.

-Nathan


Nathan Kopp <Nat### [at] Koppcom> wrote...
>
> Gamma correction in POV-Ray 3.1g suffers from a few bugs.  The most
visible
> bug is with focal_blur, where gamma correction is applied twice to the
> image.  The other problem is with antialiased pixels, where gamma
correction
> should occur after the samples are averaged, but is instead applied for
each
> sample before they are averaged.  Due to the non-linear nature of gamma
> correction, this produces incorrect results.  Luckily, the problems with
> antialiasing is not very apparent.
>

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