RE: (Gum) Multi prints???

I have made quite a few duotone prints , you just make the two tonal curves
different (i.e. you manipulate the curve of each tone so that it falls in a
different place, brown in darks, blue in highlights etc etc). This makes a
beautiful subtle print with a delicate gray midtone if you use Burnt Sienna
as one tone and Prussian blue or Indigo as the other. The most important
thing to remember is that you MUST have the tone from each colour falling in
a different part of the curve to get the full colour effect.
 
Kate

-----Original Message-----
From: Ender100@aol.com [mailto:Ender100@aol.com]
Sent: Wednesday, 14 December 2005 3:37 p.m.
To: alt-photo-process-l@sask.usask.ca
Subject: Re: (Gum) Multi prints???

Loris,

I am going to put my neck on the chopping block and venture to say that yes,
you would get a higher DMax with a more heavily pigmented mix (up to point
of failure/washing off), but that would not necessarily mean a lower
contrast negative would be required, since the exposure scale would have
more to do with the dilution of the dichromate than the amount of
pigment—exposure scale and DMax are different beasts.

With regards to duotone prints, I think that you would find that converting
an image to duotone might be a good way to get a sense of what the two color
combinations would look like, but I don't think that a duotone image as a
negative would be possible to work with—I think it would take a negative and
a positive—just as full color gum takes 3 separation negatives.

Best Wishes,
Mark Nelson
HYPERLINK "http://www.precisiondigitalnegatives.com/"Precision Digital
Negatives
PDNPrint Forum @ Yahoo Groups
HYPERLINK "http://www.markinelsonphoto.com/"www.MarkINelsonPhoto.com

In a message dated 12/13/05 7:41:56 AM, loris_medici@mynet.com writes:

My understanding is: "Because you can't get acceptable dmax without
using a very high contrast (heavily pigmented) emulsion, and when you
print with such an emulsion you have to use a very low contrast negative
- which will cause loss of local contrast and delicate tonal gradations
+ increase the risk of flaking, giving you a grainy print".

BTW, here's my question: I plan to print duo-pigment gums, a bluish dark
gray (Schmincke Neutral Gray #785, PR251 + PB60 + PG7) for shadowns and
a reddish brown (Schmincke Madder Brown #670, PR206) for highlights. I
will print using digital negatives. Is there any way I can use
Photoshop's Duotone image mode in order to design/predict the results
and design curves/negatives giving that particular look in my monitor?

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