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filmscanners: Blue Channel Noise (was: Printing A3 from a 2700dpi scan



Bob wrote:

>I think every reference I've seen regarding noise is scanned images
identifies the Blue channel as being the most noisy. I have never seen
anexplanation of why this is so, but does not appear to be dependant on the
light source or specific scanner. Maybe the noise isn't coming the film?

IME the "noise" is coming from the blue channel *and* the film *and* the
scanner. It's certainly more noticeable on blue, because the noise and/or
grain aliasing *isn't* blue! That's on a Scanwit, I should add, not an LS30.
It seems to be an *equal opportunity* problem. A solution would be nice.

Best regards--LRA


----- Original Message -----
From: Rob Geraghty <harper@wordweb.com>
To: <filmscanners@halftone.co.uk>
Sent: Thursday, March 29, 2001 9:27 PM
Subject: Re: filmscanners: Printing A3 from a 2700dpi scan

> I believe that for some reason there is more CCD noise in the blue channel
> than other channels.  It may be that the effect of Nikon's collimated
light
> is more pronounced in the blue channel than elsewhere - certainly shorter
> wavelengths might show different focus than longer wavelengths.  However,
> the negative has the blue channel inverted doesn't it? :)  I'm not hugely
> concerned about what the source of the effect may be - the fact is that
> on my LS30, all slide films scan far better in terms of apparent grain
than
> the neg films I've tried.
> ...
> Rob


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