That is a nice way of putting it. A three dimensional calibration. Three nicely printed separate color scales might not yield good tricolor print and they definitely require lots of work. And as Chis pointed out in her example people are frequently drawn to images that look like gums prints (color biased,, techically imperfect, etc), and not to images that look too much like inkjet prints.
Of course it is nice to have the controls and ability to make either.\
It is my printing day today and I hope to make a number of carbons on glass. Hopefully will have something to share.
Marek
> Date: Thu, 27 Sep 2007 23:48:47 -0700
> From: kthayer@pacifier.com
> Subject: Re: Two tricolor prints curvers in Photoshop
> To: alt-photo-process-l@usask.ca
>
> On Sep 26, 2007, at 11:38 AM, Marek Matusz wrote:
> >
> > This is something that I watch for making separations. Are there
> > places in the print that require clean two color mixes and is the
> > color separation negative of the third primary sufficently dense to
> > block the third color layer
>
>
> On Sep 26, 2007, at 4:47 PM, Marek Matusz wrote:
>
> >
> > This is FANTASTIC. After years of battling color shifts, using
> > masks, etc to find such a simple solution. Evry curve results in a
> > perfect color balance. Whats more curves can be applied to RGB
> > components separeately still with perfect color balance. Michael,
> > I'll buy a beer next time you are in town.
>
> Thanks, Marek and Michael. It seems like you're approaching closer
> to something like the three-dimensional calibration I was saying we
> need for tricolor gum, but lots easier than what I was imagining.
>
> In the meantime I had an idea that helped me understand my problem:
> I made a copy of the greyscale inverted red (cyan) channel, added a
> color layer to it, then turned that back into greyscale and looked at
> it side by side with the original greyscale. That visual sxs helped
> me grasp the relationship between negative color and tonality
> (uncomplicated by curves) better than weeks of staring at numbers
> and curves and calibration charts, and I'm a number person, for
> heavens' sake.
> Katharine
>
>
>
>
>
>
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