Archived posting to the Leica Users Group, 2007/08/18

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Subject: [Leica] Re: Scanning Tri-X
From: h_arche at yahoo.com (H. Ball Arche)
Date: Sat Aug 18 09:51:56 2007

I'd file this under BS.

Even if it were marginally true, which I doubt, it
would be the province of the sort of techno-dweebs who
agonize over angels-on-pinheads type issues.

Let's make pictures.

--- Lawrence Zeitlin <lrzeitlin@optonline.net> wrote:

> On another list someone complained about the
> "posterization" and  
> aliasing encountered in scanning Tri-X film. Here is
> the quote:
> 
> "both my 2880ppi and 4000ppi
> film scanners posterize my Tri-X negatives... which
> makes sense.  there is also nothing you can do to
> remove sampling errors after you scan.  My early
> analysis of Tri-X grain showed that it has strong
> frequency content around 4000ppi so when my scanners
> sample at around half the Nyquist frequency the
> aliasing is just a fact of life.  With finer grained
> films, the grain is still aliased, BUT since the
> signal to noise ratio is so much higher the actual
> useful *image* data is not lost and *luckily* the
> new
> aliased *grain*, while not an accurate
> representation
> of the original, is still aesthetically pleasing."
> 
> Can someone explain what he means in plain language?
>  I've scanned  
> hundreds of Tri-X negatives with my Minolta Dimage
> 5400 scanner at  
> 4000ppi, and, apart from the inevitable dust spots
> on poorly stored  
> negatives, I have yet to see what he means. If there
> is a problem, is  
> the scanner software correcting it automatically?
> 
> Larry Z
> 
> 
> 
> 
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for
> more information
> 



      
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Replies: Reply from pjleeson at mchsi.com (Philip Leeson) ([Leica] Re: Scanning Tri-X)
In reply to: Message from lrzeitlin at optonline.net (Lawrence Zeitlin) ([Leica] Re: Scanning Tri-X)