Archived posting to the Leica Users Group, 2002/03/26

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Subject: [Leica] Re: dMax and Dyanmic range - scanners
From: Jim Hemenway <jim@hemenway.com>
Date: Tue, 26 Mar 2002 09:35:10 -0500
References: <NABBLIJOIFAICKBIEPJJIEGDPEAA.darkroom@ix.netcom.com>

Austin & John:

What do scanner manufacturers mean when they say that their devices have
a high DMAX?

Are they claiming a high dynamic range, yet use the term DMAX?

Jim
http://www.hemenway.com


> Hi Don and Pablo,
> 
> Johnny explained it perfectly.  dMax and dMin are measurements of density,
> not dynamic range.  They are entirely different.
> 
> It's the same reason that chromes, though they have a longer density range
> (since they have no colored film base, their range extends from clear film
> to darkest black) than negatives (whose range extends from above the film
> base to darkest black)...yet negative film has a larger dynamic range
> (ability to discern more tones).
> 
> Line art drawings have a very large density range...but have virtually no
> dynamic range, since there are no tones between the white and the black...
> 
> Austin
> 
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In reply to: Message from "Austin Franklin" <darkroom@ix.netcom.com> (RE: [Leica] RE: Re: Digital darkroom - when isn't it photography?)