Archived posting to the Leica Users Group, 1999/12/14

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Subject: Re: [Leica] B&W Scanning
From: Eric Welch <ewelch@neteze.com>
Date: Tue, 14 Dec 1999 21:18:48 -0800

sometime around 12/14/99 11:01 AM, Mark Rabiner at mrabiner@concentric.net
was heard  to write:

> A better example would have been if the table was a dark walnut so it would be
> zone III: your threshold last sign of detail in the shadows and then you would
> have the zone VI Caucasian face three stops up from it (and if it wasn't say
> an
> expansion was in order or the #4 paper. Development for the relationship only
> between two tones would be inaccurate and in practice I've never done it.

Yes, but in the end, the relationsihp will never be linear, because film is
on a curve, and so is paper, so you've got two curves, and the physical
impossibility of representing gray tones in a linear fashion, keeping one
from having paper reflect 8 times as much light between Zone III and VI in
the negative. That was the original question, no?

- --

Eric Welch
Carlsbad, CA
http://www.neteze.com/ewelch

Zen master to hotdog vendor. "Make me one with everything."