From: Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Date: 01/27/01-08:02:02 AM Z
Judy Seigel wrote:
> ...
> So far I found that I see the "dots" at anything short of 1440 with the
> loupe, ...
A big consideration concerning dots is that the dots will be spaced
further apart in order to print lighter tones. This has been addressed
by the use of quad tone inks and adjusted software driver for the
printer by Cone. If I'm am not mistaken, this is what Burkholder is now
using and will likely eventually write up as an addendum or such to his
book.
Judy Seigel also wrote:
> ... my *understanding* is that orange holds back more
> UV light than black at same density so you don't need as much ink.
Each ink may have its own characteristic. For the HP-970 inks I have
looked at, the black ink blocks UV the best, next the yellow, then the
magenta, and the cyan not really much at all. Other inks may behave
differently. I believe the Cone quad inks are carbon piment and block
well (Dan may have some info on this).
I had been using more than one ink to try to achive more toneal
variations, but without the success required for Pt/Pd. The key with
the quad inks seems to be the light value inks, as the dots can be
printed close a posible without too much blocking density.
Whether the orange color ink combination was to simulate pyro staining
or offer more flexibility of tone generation, after investigating this
greatly, I have no confidence that this scheme can produce results
suitable for Pt/Pd negatives. The Cone system seems to have remedied
this situation, but I have not had the opportunity to investigate this
as yet. I am hoping Dan will save me some of the effort.
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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