From: Katharine Thayer (kthayer@pacifier.com)
Date: 09/08/02-02:30:00 AM Z
Hi Steve and Joe,
It seems to me Joe's question goes beyond what's in James, or available
anywhere as far as I know. (BTW, James' instructions seem rather odd to
me. Print out two of each separation and tape them together for extra
density? That seems a rather primitive method.)
If you'll look in the archives, back in, say, 1999, you'll find a
spirited argument on this topic. At the time, I argued that since the
Photoshop CMYK space was developed to optimize commercial printing
processes-- commercial inks, commercial paper, commercial printing
presses--it didn't make sense to me to assume it was the best CMYK
space for the gum process, and I said, half in jest, that someone should
develop an ICC profile for gum. I got the feeling that no one had a clue
what I was talking about. (When I printed color I worked in tricolor not
CMYK so I had no interest in developing such a profile myself.)
Since then, of course, the level of knowledge about photoshop and
digital printing of negatives has increased around here exponentially,
and several people have worked on curves for gum, but I haven't heard
that any of them has developed a CMYK profile for color separations for
gum. If I'm wrong, I'll be happy to be corrected.
Katharine Thayer
Steve Bell wrote:
>
> Christopher James' 'The Book of Alternative Photographic Processes' has
> detailed instructions on how to make CMYK separations for Gum Prints (with
> Photoshop). i haven't tried it out yet, but it's there.
>
> steve
>
> > [Original Message]
> > From: Joe <jtait@texas.net>
> > To: <alt-photo-process-l@sask.usask.ca>
> > Date: 9/8/2002 1:01:18 AM
> > Subject: CMYK Gum Prints and Color Gamut
> >
> > I have had it drilled into my head that gum can only be partially
>
> > controlled (after years of doing), and I don't question that in the
>
> > least, but I was wondering for those of you who have done CMYK gums, how
>
> > does its color gamut compare to other CMYK spaces? Do you use a gum ICC
>
> > profile in photoshop to generate color seps (I would think most people
>
> > use Photoshop to do this)? I know with the inumerable variables and
>
> > gum/paper combos, hour of the day, etc. that this seems kind of silly,
>
> > but I haven't seen ANY literature on generating color seps for gum.
>
> >
>
> > BTW, any suggestions on literature?
>
> >
>
> > Thanks.
>
> >
>
> > -Joe
>
> --- Steve Bell
> --- Veracity000@earthlink.net
> --- http://www.unbeknownst.org/~insurrective /
> http://www.angelfire.com/zine2/insurrection
> --- In fact, rock, rather than being an example of how freedom can be
> achieved within the capitalist structure, is
> an example of how capitalism can, almost without a conscious effort,
> deceive those whom it oppresses...So
> effective has the rock industry been in encouraging the spirit of
> optimistic youth take-over that rock's truly
> hard political edge, it's constant exploration of the varieties of
> youthful frustration, has been ignored
> and softened. --Michael Lydon
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