Re: R800 and R1800
Re: R800 and R1800
- Subject: Re: R800 and R1800
- 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.
It doesn't seem to behave any differently whether you choose color,
monochrome, or grayscale in the driver.
I assume the R1800 will probably behave in a similar manner. When I get one,
I will check.
Bob Frost.
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