Digital BW, The Print

Jeff,
 
I'm going to undertake the same task in the next days (I've just received
the inks), with the following idea:
 
1) Find out the actual density of the four FS inks (according to Paul Roark
they should be very close to K = 100%, C = 84%, M = 38%, Y = 27%, which are
the measured Piezo densities).
2) Find out what RGB values the Epson driver maps to pure inks in the 1160
(according to Paul Roark, again, these values should be RGB(0,255,255),
RGB(255,0,255) and RGB(255,255,0)).
3) Write a Photoshop duotone set using 4 grays with the FS densities (100%,
84%, 38%, 27%) and writing curves so that the 21-step grayscale remains
exactly the same when this duotone (actually quadtone) set is applied.
4) Write another duotone set with the same curves as in the first one, but
using the three RGB values for pure C, M and Y instead of the 3 grays (black
remains unchanged).
 
The idea is that, once I have an image in grayscale mode, I change it to
duotone mode applying the second set and then print (the first set is only
necessary to devise the correct curves).
 
As usual, tests should be run on the 21-step grayscale image. I'll let you
know how it works when I have the first results.
 
Alessandro Pardi

-----Original Message-----
From: jrandall@... [mailto:jrandall@...]
Sent: sabato 10 novembre 2001 19.02
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] RGB Workflow for MIS FS Quad Inks


I'm trying to develop an RGB/partitioned workflow for the MIS FS quad 
inkset.  I've tried Paul Roark's VM curves and "zeroing" the Blue 
curve that controls the toner and many other trial and error 
efforts.  Before I pay to have an ink pipeline installed from MIS to 
my house, I think I need some help.  Does anyone have guidance on how 
to develop a partitioned workflow for an inkset and paper combination?

Thanks.

Jeff Randall 


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