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Re: filmscanners: Scanner resolution (was: BWP seeks scanner)





Paul Chefurka wrote:


> 
> After all, 4000 ppi gives a resolution of 75 lp/mm or so, and it takes pretty 
>remarkable 

technique to actually get that kind of resolution onto film.  Or is my crude 
first-approximation 

assessment incorrect, and we actually can't resolve detail in the scan at more 
than half that - 

say 40 lp/mm with reasonable contrast?  Even that level is still sufficient for 
prints that 

appear "sharp" at normal viewing distances.
> 

I think there are two issues here.  One is that a 4000 dpi scanner 
doesn't capture 4000 dpi, and I've yet to get a straight answer on what 
they actually capture.

Secondly, the nature of the CCD sensor is that of a soft edged scan due 
to a number of aspects of the nature of these chips, so you might be 
right that using current technology will not allow for much improvement.

Art






 




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