[pure-silver] Re: Why Zone V at 50%?

["Christina Z. Anderson" <zphoto@xxxxxxxxxxx>]

Bogdan,
I think APUG is now discussing this, but check out 
PrecisionDigitalNegatives.com on the web and you will find Mark Nelson's 
system, which I have been using now for a couple years. I initially used it 
with alt process--gum, palladium, cyanotype, vdb, etc. etc.  but the process 
of developing custom curves for all processes includes BW.  I developed 
curves for 6 different papers with his system--Bergger, Ilford, Forte cold 
and warmtone.

It is necessary to have a printer that has dense enough ink--the Epson 2200, 
2400, 1800, 4000, and others work well.  I don't know about other printers 
such as HP or Canon but I know the Epsons are great.  Also, in the printer 
driver you can up your ink density in percent increments, and Pictorico 
transparency will allow you to easily up ink density to about 15 or 20%. 
After that it puddles, but Pictorico is coming out with a new transparency 
with a thicker ceramic coating that holds TONS of ink--a boon in the BW 
analog darkroom, being that bw papers are so much faster than alt process.
Chris
CZAphotography.com

----- Original Message ----- 
From: "Bogdan Karasek" <bkarasek@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, September 01, 2006 9:30 PM
Subject: [pure-silver] Re: Why Zone V at 50%?


Hi,

Where can I get more info on making digital negs and then printing
analog.  I assume that APUG discusses this???

And the Large Format site????  Is that the NewsGroup or a list?

Cheers,
Bogdan

Ralph W. Lambrecht wrote:

> I have listed the same question below on APUG and the Large Format site, 
> so
> if you check those, ignore this post. Nevertheless, the 'real' experts are
> probably here, so I duplicated the post.
>
>
> Why does a digital camera record a Kodak Gray Card (Zone V) as 50% gray?
>
> A Kodak Gray Card represents an 'average' scene of 18% reflectance, but 
> that
> has nothing to do with a mean or medium on a grayscale. A gray card has an
> absolute log reflectance density of about 0.75. Medium gray on a 2.2-gamma
> monitor and a calibrated print thereof is about 0.66. So the image of the
> card is lighter than the card itself. Why? Who came up with this 
> assumption
> or standard? Is it a mistake? Did someone assume 'average gray' meant 50%?
>
>
>
> Disclaimer:
> I'm aware that this is a mainly or exclusively analog forum, but I doubt 
> to
> get a satisfying answer for my question in a digital forum, since they
> usually understand little about the Zone System. That's why I post the
> question here. Besides, I need this to work out some details about making
> digital negatives, which will be used to make pure-silver contact prints.
> So, it's an analog question in a way.
>
>
>
>
>
> Regards
>
>
>
> Ralph W. Lambrecht
>
> http://www.darkroomagic.com
>
>
>
>
>
>
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--
________________________________________________________________
  Bogdan Karasek
  Montréal, Québec            e-mail: bkarasek@xxxxxxxxxxxx
  Canada

                  "I photograph my reality"
__________________________________________________________________


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• References:
  • [pure-silver] Re: Why Zone V at 50%?
    • From: Bogdan Karasek

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