Digital BW, The Print

Ok stet that.  F-stop = double the exposure/luminance. Duh.  Now I've got
it. So under current inks we are getting around 5.5 stops of tonal range
from matt papers.


> From: Steve Kale <stevekale@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Wed, 24 Nov 2004 18:56:42 +0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] Tonal range recording
> 
> 
> Thanks.  OK I think I am beginning to understand this stuff a lot more by
> going through Noreman Koren's pages. I found "Why Gamma?" on this page to be
> very helpful in relating film to photographic paper, and also for thinking
> about the whole process of linearisation a print curve (printing a step
> wedge, measuring it and linearising it).
> 
> http://www.normankoren.com/makingfineprints1A.html
> 
> My maths is very rusty though - I haven't done log math since highschool.
> As a result I am stuck on the following sentence:
> 
> "One unit on a Log10 scale (such as Density) equals 3.32 exposure zones
> (f-stops)."
> 
> Any help appreciated.
>