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

["Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>]

I suggest to start with Dan Burkholder's book 'Making Digital Negatives'.

http://www.danburkholder.com/






Regards



Ralph W. Lambrecht

http://www.darkroomagic.com







On 2006-09-02 05:30, "Bogdan Karasek" <bkarasek@xxxxxxxxxxxx> wrote:

> 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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