> Matt Crawley <matt@xxxxxxxxx> wrote:
>
> Hi Wayne.
>
> I'm not 100ure of the details. I think I heard of this info first
> on this
> list actually... I know there is info on the web about this too but I
> don't
> remember the link. As I remember the story goes like this...
>
> Different types of light sources yield cleaner or noisier results.
> Polaroid
> scanners in particular have received good reviews for lack of noise
> and this
> was attributed to their use of "Cold Cathode" light source vs the
> LED's that
> Nikon use. Since negs generally yield noisier scans than
> transparencies a
> person who plans on scanning mainly negs should look for the scanner
> with
> the least amount of noise.
>
Ok, starting to make some sense. With transparencies the noise appears in the
dark areas, the dark areas often just get "clipped" to pure black (0,0,0).
With
negs the noise also appears in the dark areas, however the reversal to a
positive
then puts the noise in the highlights which is more obvious.
I'll have to think a bit more about it.
...Wayne
Wayne Harridge
http://members.optusnet.com.au/~w_harridge
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