Re: Re: Gum dichromate issue

From: Sam Wang ^lt;[email protected]>
Date: 08/10/04-06:52:41 AM Z
Message-id: <>

Hi Giovanni,

If you really want "accurate" colors, I suggest doing Ilforchrome or C-prints, or even "Giclee". With gum
you will not find information that will give you accuracy unless you spend a lot of time working it out in
your own lab. If there were such information out there, everybody would be making color-correct, and
boring, gum images.

The books on the subject all deal with commercial methods of truthful reproduction of colors, but gum
is an artistic process, where expression is more important thant mere reproduction. So I would
recommend doing your own tests instead of relying on what someone else might have written.

I've always believed that it's better to learn with "elbow grease" and take theory or someone else's
writing with "a grain of salt". It's good to do some reading, but there are no shortcuts.

Sam Wang
> From:
> Date: 2004/08/10 Tue AM 12:23:59 EDT
> To:
> Subject: Re: Gum dichromate issue
> Thanks Etienne,
> No, I do not have problems with the registragion and I print on 16x20 canvas
> size pictures of 14x11, I size the paper and I am on the limit of problems.
> I do my threee negatives with Photoshop and I print full color confortably,
> I am trying to learn and read more to avoid possible mistakes.
> Most of my errors come from specific pictures so the proper negative is an
> issue, sometimes I change the curve factor (on photoshop which is the
> contrast in a conventional film) on the Red negative but again I am
> guessing. Why? I read somewhere that it was the most important of the three
> negatives. Why? Is the first I use to print, then I go with the Blue (Yellow
> pigment) and I start guessing the solar exposure time and finally I do a
> third guess with the magenta pigment to "see" the picture.
> The other issue is the pigment, remember "pure colors" do not exist, how
> should this be dealt or handle in reality?
> Giovanni
Received on Tue Aug 10 06:52:53 2004

This archive was generated by hypermail 2.1.8 : 09/14/04-09:17:58 AM Z CST