Re: R800 and R1800
Re: R800 and R1800
- Subject: Re: R800 and R1800
- From: Robert L Krawitz <email@hidden>
- Date: Sun, 27 Mar 2005 20:16:51 -0500
From: "Bob Frost" <email@hidden>
Date: Thu, 17 Mar 2005 19:52:34 -0000
David,
> I've done microphotographic analysis of monochrome prints from
> thePX-G5000 (Japanese R1800) and find it full of color dots in the
> grayscale mode,
> but can't determine that there is actually any yellow ink, however yellow
> is
> always the most difficult ink to find.
From my decoding of R800 monochrome print files, the printer uses
yellow ink all the way from 15/15/15 to 245/245/245 (I 'printed'
gray patches at intervals of 10).
> Well, I have not reversed the Epson driver's gloss optimizer
> usage to that degree, but in other systems I have been involved
> with, gloss optimizer is applied using a "reverse curve", where
> maximum polymer is placed in white areas, and as light tones are
> added, gloss optimizer is reduced, to keep a fairly even total
> level of polymer on all light areas.
In the R800 use of GLOP starts at 105/105/105 (where use of
PhotoBlack stops) and is steadily increased to 255/255/255, where
it is the only 'ink' used. The use of magenta, blue, cyan, and
yellow decreased steadily from 105/105/105 as the use of GLOP
increased. Red was not used anywhere.
BTW, I have a couple of utilities for decoding Epson print files. One
of them's a Perl script (parse-escp2) that parses these files and
produces a textual dump; the other is a C program (unprint) that
produces a PNM file from one or more channels of the output file.
Both of these utilities have been very useful in developing
Gimp-Print/Gutenprint, and they're both covered by the GPL and are in
the source distribution. If anyone's interested, please let me know.
Also, the next release of Gutenprint will have 6-color support for the
R800 and R1800. I completed first pass tuning work on Premium Glossy
today, and I should be able to complete tuning of the matte black
shortly.
--
Robert Krawitz <email@hidden>
Tall Clubs International -- http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail email@hidden
Project lead for Gimp Print -- http://gimp-print.sourceforge.net
"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
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