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[filmscanners] Re: grain

On Thu, 14 Feb 2002 12:57:53 +1100   (markthomasz@ozemail.com.au) wrote:

> I've noticed that on some transparency films, I get a grain-like effect
> in shadows when I use a black point other than zero (in Vuescan).  I
> haven't yet looked into exactly what is happening, but the 'noise'
> vanishes as soon as I set bp to 0.
> So it is obviously not CCD noise

What you describe is very likely CCD noise. On well behaved scanners most
of it is below the black point on any film you want to scan, on less
fortunate models it climbs up toward the midtones and you can't just chop
it off without sacrificing shadow detail.


Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner info
& comparisons
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