----- Original Message -----
Sent: Saturday, March 03, 2007 9:53
Subject: Re: venetian blinds, Epson 1280
and other printers
I'm just about through getting a 7800 calibrated using the
Imageprint RIP. It is a bit premature to claim victory, but early
indications are showing the following benefits:
1) the dithering pattern, when examined with a loupe, is both finer and
smoother, and to my eye, sharper than that generated by the Epson
2) highlights are beautiful - subtle in a way I have only heretofore seen
with in-camera negatives.
3) The prepackaged profiles for Pictorico make it possible to print a
decent palladium negative by simply inverting the file and printing
4) Fine tuning the output takes a very small correction curve, if you
even care to bother.
5) RGB space is the way to go, along with some subtle colorization.
6) The RIP takes full 16 bit input. So you can stay in 16 bit mode
through the whole process, including the printing step.
7) Using roll media, you can tile many negatives on a single print job
and save a lot of wasted pictorico.
Weird things about the 7800:
The straight-ahead PDN system does some extremely strange things when you
use the standard Epson driver and colorize the negative. For instance, the
spectral tests I ran indicated that a Red 200, Green 25 blend would be ideal
for palladium. Using the PDN test tablet, here are the UV densities for the
first couple of highlight steps:
Step 100: 2.03 logD UV
Step 93: 2.07
Step 91: 2.6 !!
Step 90: 2.85!!
Step 89: 3.17
Step 88: 3.24
Step 87: 3.52!!
Step 85: 2.93
Step 84: 2.68
Now this is just plain weird.
Visually, the steps appear to be getting less dense as you move down to
lower step numbers. But my UV densitometer tells another tale. And I confirmed
this by printing the negative again AND deliberately overprinting the step
tablet by a stop to see if I could even get any tone in those strange
steps in the middle. It tells the same story. So a correction curve using this
PDN color would be very difficult if not impossible to make with these density
reversals in a gradated step wedge what in theory is the same
You can use a RIP
with PDN—though once I noticed a strange repeating pattern in a print made
from a negative off a RIP. As you mentioned, there seems to be no free
lunch. It is a matter of finding a combination with the least
problems. Though I must say, other than the Venetian Blinds, which I
solved by getting an R1800, I have very little problem making good
In a message dated 3/3/07 7:10:10 PM, email@example.com
Thanks Mark. Seems like there is no free lunch with ink
jet printers, we are always chasing one problem or another. I wonder if a
RIP could solve some of the ink density problems. I think Clay Harmon is
working with IJC/OPM and the 7800. Could a RIP be used with PDN
Precision Digital Negatives
- The System
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