Digital BW, The Print

Trying to find the white paper to Geoff's method in our archives and will share when I find, including the PS curve correction routine.

I think however, if you can determine your minimum exposure and maximum exposure to affect silver during development - and you can plot your 50% - you will not have to deal with all the additional points of the curve. Do you see?

Think of a stouffer used to calibrate a scanner irregardless of the sensitivity of the paper these strips are usually used for. The scanner interprets density without regard to the sensitivity of the output paper or film for which the scan is intended (luckily). 

Being digital to the output you only need to worry about the 1:1 - if you can record dMin, dMax and the 50% density you can fix the curve's mid-point. Then the 1/4 and 3/4. You could plot the 1/8s as well, and make consideration for the toe and shoulder if you choose. It's rather simple this way. 

Jon Cone
Piezography

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "E.Neilsen" <e.neilsen2@...> wrote:
>
> Jon, With film we have toe and shoulder, how is your 50% working with that?
> I am interested in seeing what is going on. 
> 
>  
> 
> Eric Neilsen
> 
> Eric Neilsen Photography
> 
> 4101 Commerce Street, Suite 9
> 
> Dallas, TX 75226
> 
>  
> 
> www.ericneilsenphotography.com
> 
> skype me with ejprinter
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> www.ericneilsenphotography.com/forum1
> 
> Let's Talk Photography
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>  
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>   _____  
> 
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of piezobw
> Sent: Wednesday, April 14, 2010 9:10 PM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: [Digital BW] Re: Is Camera Raw enough?
> 
>  
> 
>   
> 
> Hey Eric,
> 
> You don't shoot a target like a card. You just expose film in 1/2 stops.
> Geoff had made some translucent white filters which fit over the lens. Aim
> it at the sky or anywhere for that matte where there was light. Was a matter
> of making 1/2 stop exposures to find 50% from dMin to dMax.
> 
> I will try and dig up my notes on it. It's a cool technique for those still
> shooting film. 
> 
> Jon Cone
> Piezography
> 
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>