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[filmscanners] Re: Polaroid SS4000, noise, andoversampling (was: VueScan 7.5 beta 8 Available)

Steve wrote:
>Eric ...
>>Does a noiseless scanner exist?
>>Why wouldn't oversampling and averaging help reduce hardware-caused noise?
>>Hardware problems can often be somewhat fixed in software, after all.
>I'm surprised anyone is even arguing about this.

There's no argument, it's just that scanner mileages vary!  My Acer has 
effectively zero noise in shadows (and its dynamic range is actually pretty 
good), so multiple passes are effectively worthless to me (for slides).  
However, if I get the black point just slightly wrong, I can certainly 
introduce noise.  The important thing is to *try* all the possibilities, and 
not just assume that multi-scanning is getting the best out of your scanner..

I've been caught before thinking that I had got the best out of a problematic 
slide, only to discover days/weeks/months later that using a slightly different 
approach (and not necessarily the one suggested by conventional wisdom!) solved 
the problem.  In some cases multi-scanning may well be the solution - in the 
case of the Acer, and I suspect the Polaroid, I doubt it.  But the only way to 
know is to try..

mark t

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