Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul D. 
DeRocco" <pderocco@i...> wrote:
> > From: Glenn Mitchell [mailto:gmitchel850@y...]
> >
> > 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...
> 

I hear ya!

I bought a DiMage 7i for a small camera to carry around for street 
photography. I tried it for a day and returned it. Luminosity and 
chromatic noise were dreadful! Shutter delay was excruciating. 

I got my money back from the dealer right away!

Cheers,

Mitch