Digital BW, The Print

Herb,

I posted that link and definition along with some others for Austin awhile
back and he dismissed it as pedestrian, vague and unscientific since it did
not include an equation and a precise definition of "lightest light and
darkest dark ".

Austin has consistently said that photographs are not continuous tone and
that the knowing the dynamic range tells you how may tones there are. Austin
has specifically said that something like microfilm has a much lower dynamic
range because it has fewer tones than conventional B&W film.

This definition is a pretty good one by the way. But what they show in their
examples is more often thought of as contrast differences rather than
dynamic range differences.

Martin

----- Original Message -----
From: "hsitz" <hsitz@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Tuesday, April 09, 2002 7:29 PM
Subject: Re: [Digital BW] Final(ish) Ranges about Imaging


> If you'll read the brief article at this webpage carefully, you'll
> see that it's in agreement with what Austin has been saying.
>
> http://www.library.cornell.edu/preservation/tutorial/intro/intro-
> 05.html
>
>
> The two pictures of the buildings are a perfect illustration of
> images with identical "density range" (i.e., they both go from full
> white to full black), but with different "dynamic ranges".
>
> Also, don't be fooled (as I was, at first) by the phrase, "the
> dynamic range does not automatically correlate to the number of tones
> reproduced".  That phrase isn't saying that Austin's understanding
> of "dynamic range" is wrong.  It's saying that Austin' understanding
> is right, but that an image system's dynamic range is merely
> potential, and that it may still produce images that don't make full
> use of its dynamic range.  -- Herb
>
>
>
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