Archived posting to the Leica Users Group, 1999/12/13

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Subject: Re: [Leica] B&W Scanning
From: Martin Howard <howard.390@osu.edu>
Date: Mon, 13 Dec 1999 14:59:05 -0500

Eric Welch wrote:
> 
> 
> Not at all. Sensitometry is logorithmic, not linear.
> 

Yeah, but the zone scale is based upon perception, right?  Zone VI is
supposed to be twice as light as Zone V, and Zone IV is half as bright
as Zone V.

I don't get the point of thinking in zones, if the zones aren't always the
same.

M.

- -- 
Martin Howard                     | 
Visiting Scholar, CSEL, OSU       |    What boots up must come down.
email: howard.390@osu.edu         | 
www: http://mvhoward.i.am/        +---------------------------------------