Re: R800 and R1800
Re: R800 and R1800
- Subject: Re: R800 and R1800
- From: email@hidden
- Date: Thu, 17 Mar 2005 09:24:18 EST
In a message dated 3/17/05 5:51:03 AM, email@hidden writes:
Would you consider them even less suitable for neutral B&W printing than
the CcMmYK or CMYK models are?
Not necessarily; either the added primaries are not used in grays, in which case they would be no worse then previous models, or they are used, and anything that reduces yellow usage should reduce metamerism...
I expected that more or less and said so in the digital B&W mailing
list. On the other hand you may expect more detailed, finer gradations
of its 1.5 droplet in monochrome printing but it doesn't have a setting
for Black Only in the driver, there's a monochrome setting but that's
using color in the print. Harrington's QTR driver may solve that
Any channel control method that removes yellow ink will improve consistancy... given that these printers don't eliminate yellow ink automatically in monochrome mode. 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.
but I
still do not expect it to become a nice B&W printer despite an
acceptable black Dmax reported so far. A black + a grey or more greys in
an inkset do wonders. The number of nozzles that squirt black in
monochrome mode counts as well for consistency in B&W printing.
No question; these printers with a gray inkset offer phenomenal results!
Another issue is the use of the gloss optimizer, where it is used to
print on white gloss areas to reduce the difference in gloss with the
printed area it also makes the white a bit grey.
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.
A suspicion: In time it will be harder to keep the desktops models + the
Epson driver consistent in color.
This is true of all Epson printers. The initial beta batch is manufactured to a tight standard, all of the units are new, the paper and ink are all from one batch, and the canned profiles match all of the above. A couple of years later, when manufacturing has continued through assorted changes, many batches of inks and media are out there, heads have worn or developed partial clogs, ink manufacturing has been moved to another country, etc... canned profiles are not as tightly linked to every single unit, and some users may not find canned results acceptable. Adding more primaries does add a couple more variables to this mix...
The RGB profiling relies on the
N-color separations in the paper settings. The lack of custom
linearising is harder to compensate in profile creation when 6 hues are
used than with 4 hues. An interesting test of Bob Frost showed that a
greyscale wedge printed in monochrome had blue all the way but the
heaviest shadows, black generation above 50%, below that CMYBlue. The
blue is probably used to compensate for the warm black ink used but kept
in the mix for a simpler method in total. One would expect a longer
black generation in the monochrome mode of this driver given the
smallest droplet size of 1.5 picoliter.
All in all I think that Epson will keep its CcMmYKk inkset models,
especially on the wide formats.
I wouldn't bet the farm on that... the virtues of wider gamut and finer dot probably outweigh the disadvantages.
Like the 4000 we may get a choice of
inksets per model.
Glop is now the acronym for gloss optimiser on the digital B&W list :-)
Glop is good stuff; if you are into gloss prints. Many digital black and white listers are on the infinite search for the holy grail of perfect fiber-based silver print emulation, with an innate dislike of gloss.
C. David Tobie
Product Technology Manager
ColorVision Inc.
email@hidden
www.colorvision.com
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