Re: How to apply curves in PS for digital negatives...

From: Grace Taylor ^lt;>
Date: 11/28/05-08:02:02 AM Z
Message-id: <>

Judy, there's still a WHOLE lot I don't know about getting the best
results for alt-photo printing from digital negatives, so I still have
a lot of learning to do. I have a question. Would the print-out you
suggest be an ink-jet printout, or a Van Dyke print of the step tablet?
  It has been the Van Dyke print of the step tablet (along with an
image) that I have used to adjust the curve, using a percentage guess
as to how much to adjust. Then adjusting again on the next VD printout
until the result looks the way I want it to. I've never used a
densitometer, but it would certainly be more accurate than eyeballing.

On Sunday, November 27, 2005, at 10:07 PM, Judy Seigel wrote:

> On Sun, 27 Nov 2005, Grace Taylor wrote:
>> Excellent--thank you. I find that you can also go to
>> image,adjustments,posterize, and a dialog box will let you type in
>> the number of steps. Grace
>> On Saturday, November 26, 2005, at 04:03 PM, John Brewer wrote:
>>> In CS I would use the posterize edges filter
>>> (filters>artistic>poster edges), varying the posterization slider to
>>> get the required number of steps.
> I may be misremembering, since it's been a while, but, as I recall,
> what makes an arithmetic progression in Photoshop density onscreen (as
> by posterizing) does not necessarily, in fact does not PROBABLY, print
> such a progression with your particular printer, ink, & substrate.
> If the idea is to get the digital equivalent of the Stouffer 21-step,
> which goes up .15 per step for 21 steps, on a printout, I think you
> can start with posterized but then want to read the printout on a
> densitometer & adjust back & forth.
> Judy
Received on Mon Nov 28 08:04:25 2005

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