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Re: [ot] slide vs neg D was Re: [OM] Kodachrome Scans

Subject: Re: [ot] slide vs neg D was Re: [OM] Kodachrome Scans
From: John Hudson <xyyc@xxxxxxxx>
Date: Tue, 07 Nov 2000 23:45:00 -0800
WKato@xxxxxxx wrote:
> 
> <<[snip]... "Slide film maps a density range of 0:2.7 to an intensity range
> of
> 1:500, but negative film maps a smaller density range of 0:2.4 to a larger
> intensity range of 1:4000."
> 
> Trnaslation for the digitally uninitiated, please, and comment on the
> implications.>>
> 
> I quoted this because I don't know too much but I will attempt to render my
> understanding of this.
> Density range is measured logarithmically meaning that you get a doubling
> every 0.3 in density increase.

snip

There is an excellent and comprehensive discussion of this whole issue
on pages 85 through 93 of Ansel Adams' "The Negative".

John Hudson
Vancouver, BC

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