Warp <war### [at] tagpovrayorg> wrote:
>   Have you tried making grayscale images with a 24-bit resolution?
> Have you counted how many shades of grey you have available at
> that bit depth? Answer: 256.
>
>   256 shades of grey may be enough for most applications, but not
> for all. You start seeing the limitation in some cases.

especially when there is a little bit of color. instead of stepping
one grey level, it will make separate 1-bit R,G and B steps.
this is very visible, but easy to solve:
add a little of noise to your texture. make sure the noise resolution
smaller than the size of a pixel in the final image.
(it may be a bit slower, because of the more complex texture and more
work done in anti-aliasing, but the result is very good)

jaap.

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