From: Larry Roohr (lrryr@home.com)
Date: 09/28/01-08:01:26 AM Z
Nick,
Even density delta's for even % steps is what you want. I put an excel
spreadsheet up at members.home.net/lrryr/digitalnegs that helps with the
density to photoshop transfer function interpolation.
I have found that the piezo inks have higher uv density's than my
densitometer tells me, goodness for our purposes.
I'm glad to hear your working on this. I was well into it a few months ago
along with gum, but since then my job (pesky thing) has managed to
completely dominate my life.
If you'd like to verify your method you could send me a step wedge or two
and I'd be happy to run it through the densitometer.
Larry
-----Original Message-----
From: Nick Makris [mailto:nick@mcn.org]
Sent: Thursday, September 27, 2001 8:32 AM
To: Alt Photo
Subject: Digital negs - transmitted vs reflected light
As I have previously reported, I am having some success with the new MIS
Quadtone Full Spectrum inks and the PiezographyBW plugin (not to mention
similar success with the Epson driver for the 1160).
Here's the rub:
I have been printing a 21 step image consisting of 0-100% in 5% increments.
While the reflected image appears quite suitable, I questioned the
suitability of the output for contact printing with transmitted light
because the early test print indicated something was that something was not
right.
Not having a densitometer, I decided to take some relative readings of each
step with my color analyzer (Bessler PM2L) set to the white position. The
object was to determine the relative transmission characteristics of each
step. The object being to make sure that each step produced a seperation
similar to that of all the others.
After tinkering with this for some time and making a number of curves to
produce the desired results, it occurred to me that I might not be on a good
track. I am actually close to finalizing the curve, but wanted to hear from
some of you about this approach. FTR, I havn't made a test print of the
current curve.
Comments?
Many thanks,
Nick
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