Re: Digital Negs - RGB vs CMYK

From: Christina Z. Anderson ^lt;[email protected]>
Date: 12/02/04-07:21:44 AM Z
Message-id: <003e01c4d871$e05753a0$6101a8c0@your6bvpxyztoq>

Good morning all,
Whether anyone does or doesn't print exact color is not as interesting to me
as the fact that you can print exact color in this age, without a lot of
muss and fuss. I find that fascinating. I just betcha if diginegs were
available back in 1839 Kodak would be doing gum today :)
Katharine, interesting you should bring up Livick, as I've just reread his
book for the umpteenth time.
First I will say it is commendable he has shared his process step by step,
and he is a master gum printer. Certainly I have to say his gums are very
true to color.
He's certainly very anti-mixing your own gum from scratch, which I find odd,
but I suppose he gets more predictability with using the same gum from the
same manufacturer (if that is ever possible to have the same gum). I
started mixing my own from powder when I found out the Photographer's
Formulary did just that. I figured my food processor would work as well as
their mixer.
Livick sprays his gum layers with a spray gun so probably he needs to have a
very particular baume to never clog the sprayer, but for the rest of us who
brush on, powder is great. I watched Sam Wang mix his gum/pigment solution
**at time of use** with powdered gum (dump in powdered gum, water, pigment,
dichromate), which dispelled any myth about not using powdered gum
Anyway, this is not on the subject heading topic, so back to my Livick
He uses CMY separation negatives, but also talks of RGB sep negs in
continuous tone..
On p. 53 he says he prints the yellow gum layer with the yellow neg, the
magenta with the magenta, and the blue with the cyan. He does not use the K.
Not having ever done CMYK, is this a typo, or those of you who do use CMYK
do you use the negs like this? Or is it just that the service bureau he
uses labels the negs this way? In other words, RGB negs use the R for cyan,
the G for magenta, and the B for yellow.
----- Original Message -----
From: "Katharine Thayer" <>
To: <>
Sent: Wednesday, December 01, 2004 4:04 PM
Subject: Re: Digital Negs - RGB vs CMYK

> Judy Seigel wrote:
>> On the 3rd hand, this is all probably overkill -- does anyone print gum
>> for exact "photographic" color repro?
> Stephen Livick does....
Received on Thu Dec 2 07:22:05 2004

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