[pure-silver] Re: Why Zone V at 50%?
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 02 Sep 2006 11:47:51 +0200
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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