RE: Epson i1 profiles
RE: Epson i1 profiles
- Subject: RE: Epson i1 profiles
- From: Roger <email@hidden>
- Date: Mon, 16 Mar 2009 16:56:56 -0400
Dear J. Craig,
You're not saying what you are printing through? But I sense from your
description below, that you are sending through the Epson RGB driver and not
through some third-party RIP like ColorBurst or GMG.
If I were you, using your i1 spectrophotometer, I'd measure by hand the
"extremes" or gamut boundaries of your two profiles, on paper. Or simply
lookup the Lab values for RGBCMY for the two profiles. You could plot them
on an ab diagram. You would have a better idea of what you're up against, in
my view, than what a 3D grapher would show you -- no offense to 3D
visualize, they are uselful. I mean, this exercise only takes a second to
do. And then, why not calculating the DeltaE values between the two sets of
RGBCMY values? While you're at it. This will tell you, unequivocally, how
much is one relative to the others. You may be surprised. If you find that
the 7600 profile is "bigger" than the 7800 profile, on the same paper, those
are nice questions for Epson. But, you see, since you are not printing
through an independent mechanism, like a RIP, you have no control over the
internal conversions going on behind the scene in the printer driver and you
are essentially at the mercy of Epson's good will. It may turn out that,
even going through a GMG RIP or some other kind of printing device, that you
would still not get better results than what you describe -- I don't know
this paper -- but you would know why, at least.
I'm curious to see what Epson will have to say about this one. Or other list
contributors.
My two cents / Roger
> I am fairly new to this list-serve with one prior question outgoing
> and a few responses contributed. I work as a commercial photographer
> with a high interest in good color management practices. I am
> working in a calibrated and, for the purpose of this discussion,
> closed-loop workflow. Having just acquired a used Epson 7800 printer
> after using my trusty Epson 7600 for several years, I generated some
> new paper profiles for the 7800. I use an i1 spectrophotometer and
> have been very satisfied with the results, also for several years.
> It is my understanding (this may well be where I'm going wrong) that
> the 7800's K3 inkset was designed to have a larger gamut than the
> older Ultrachrome inkset. The new pigment inks also addressed some
> B&W printing issues along with metamerism problems.
>
> When I compare the profiles I've generated in the Apple Colorsync
> Utility for the two printers, from the same media, the new profile
> shows as significantly smaller than the older 7600 profile in almost
> all areas. This is true of the Somerset fine art paper comparison as
> well as Epson Enhanced Matte paper comparison. This seems counter-
> intuitive because it would indicate that the new inkset is less
> capable of the extremes of saturation and density (gamut), not more.
> Am I missing something? All profiles were generated at least twice.
> I don't use profile editing software.
>
> Regards,
> Craig.
>
> J. Craig Sweat Photography, Inc.
> 1026 S. Perry
> Spokane, WA 99202
> 509-534-8020
> jcsp.net
>
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