Re: Linearizing The Epson Printer
Re: Linearizing The Epson Printer
- Subject: Re: Linearizing The Epson Printer
- From: Jack Kelly Clark <email@hidden>
- Date: Wed, 12 Jun 2002 14:38:07 -0700
Jack Kelly Clark <email@hidden> wrote
We preproof proof a lot of images destined for cmyk offset to
this old, no color adjustment profiled (NCAP) Epson. We get
surprisingly good matches to the contract proofs (using the CMYK to
RGB cross rendering technique).
Dick Busher <email@hidden> then wrote:
I am somewhat confused as to exactly what is your work flow.
Am I correct in assuming that you profile the printer as an RGB
device, make your CMYK
conversions for the printing press, convert these files back to RGB
via the print
profile, apply the Epson RGB profile, and then print via the Epson driver?
Or do you profile the Epson by sending it a CMYK profile test file
(letting the Epson
driver convert the file to RGB and then back into Epson CMYK), make
your press CMYK file,
apply CMYK press to CMYK epson profile conversion, and then print
that converted CMYK
file via the epson driver?
Dick,
You basically hit the nail directly on the head in your first
presumption above. It's all done through the Epson driver and
Photoshop. Here's how we do the cross rendering technique in
Photoshop 6: First, we convert the finished RGB image from Adobe RGB
to the printer's CMYK using the custom profile we have made for that
print shop. Then we convert that CMYK image back to RGB using the
custom RGB profile made for our Epson 3000 (which is loaded with
Lyson Fotonic inks and fed the economical 32# Red River Premium Gloss
paper). The Rendering Intent used for this bass akwards CMYK to RGB
mode change is Absolute Colormetric. This Intent seems to do a pretty
good job emulating the base color of the media the print shop uses
for their contract proofs.
We use this technique to spot check results as we are preparing a
group of images for a publication. Because it doesn't utilize a real
RIP, we can't proof the design elements. But it definitely helps our
photographers to proceed with confidence, since the final CMYK output
device is always miles away. Eventually we'll get a real RIP so we
can accurately preproof proof the whole job. I've shown some sample
results of cross rendering to several press and prepress people at
some of our print vendors, and they are quite amazed at how well the
inkjet matches up to their contract proof. It's all in those magic
profiles (in spite of their flaws).
Special thanks to Andrew Rodney who taught me this technique about
five years ago (yikes, time flies when you're having fun).
--
Jack Kelly Clark
Principal Photographer
ANR Communication Services
University of California
Davis, CA 95616
(530) 757-8987
http://anrcatalog.ucdavis.edu
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