Digital BW, The Print

> From: Glenn Mitchell [mailto:gmitchel850@...]
>
> Luminosity noise is often speckled about. But chromatic noise often
> affects sky, shadows, water and is less/non-evident elsewhere in an
> image.
>
> Noise is a separate issue from posterization owing to nonlinear
> transformations during image editing.
>
> There is no reason to expect noisy images from a digicam to
> obliterate all evidence of posterization.

... other than the fact that my old Minolta DiMage 7 does in fact have so
much noise that I can't manage to coax any visible posterization out of its
images, no matter what I try. I've done some rigorous testing of it, taking
raw data and rounding it to eight bits, and then trying to create
posterization by applying really nasty curves to it, and then trying the
same thing on gamma 2.2 TIFFs. I can get horrible noise levels, but never
anything that looks like posterization.

My 10D is a completely different story...

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@...