[pure-silver] Re: Contrast grades
- From: Robert Hall <robert.g.hall@xxxxxxxxx>
- To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 26 Jul 2013 12:13:06 -0600
Many of the papers out there will have a data sheet that tells you what
contrast to expect with a particular filter.
Each paper will have it's own and will vary a bit depending on your light
source too, I'm sure.
There are a few papers out there that, while VC paper, can't reach a grade
5 in contrast.
Robert Hall
www.RobertHall.com
www.RobertHall.com/workshops
www.facebook.com/robert.g.hall
On Fri, Jul 26, 2013 at 12:09 PM, Sauerwald Mark
<mark_sauerwald@xxxxxxxxx>wrote:
>
> I understand how a higher number for the contrast of a paper, or for
> variable contrast papers, using a filter for the higher grade results in a
> higher contrast print. What I am wondering is if there is any objective
> measure of what a contrast grade of 'N' is. If I use contrast grade 3
> paper from one manufacturer, will I see the same contrast as if I use grade
> 3 from another manufacturer?
>
> I imagine that plotting the exposure vs density you would be able to
> measure the slope of the curve at some point (perhaps when the density is
> at a predefined level,) and the steeper the slope, the greater the contrast
> - and you could define the contrast grades by defining this gradient for
> each grade has that been done? If so, where is it documented?
>
> Mark
>
>
>
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