Re: Profiliong Epson Pro 5500 with Archival Inks
Re: Profiliong Epson Pro 5500 with Archival Inks
- Subject: Re: Profiliong Epson Pro 5500 with Archival Inks
- From: Terry Wyse <email@hidden>
- Date: Tue, 28 Aug 2001 09:10:39 -0400
on 8/28/01 8:23 AM, Udo J. Machiels wrote:
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"Pigment inks which have UV inhibitors require a UV spectrophotometer in
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order to read properly. If your Spectrocam does not support UV then you will
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have to have the unit upgraded. Non UV spectros will cause the colors to
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phosphoresce when reading, this gives false readings, a metamerism
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nightmare."
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I am a bit confused if I look at the information from X-Rite measuring
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devices, for example:
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X-Rite DTP41UV AutoScan Reflection Spectrophotometer
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High accuracy AutoScan Spectrophotometer with UV cut-off filter installed
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UV filter minimizes effects of brightners found in some paper stocks.
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So does my device have to read UV or not?
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My Spectrocam does!
I think their verbage is confusing. It *sounds* like they're saying you NEED
to be able to read the UV! In reality, I think they mean you need a spectro
with a UV cut-off filter.
It just so happens I'm doing a full week of testing with an Epson 5500 and a
BESTColor RIP. So far I've just created RGB profiles that I've printed thru
the Epson driver from Photoshop 6 (print target as: Color Adjustments OFF,
Photo 2880 setting, source=untagged RGB, destination=same as source). The
results are outstanding (no banding whatsoever). The proof is slightly green
but a decent match to the image displayed in Photoshop ("PDI Target" in
AdobeRGB displayed on an Optical calibrated/profiled LaCie electron22blue
monitor).
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I know the problem is not solved (metamerism = colour will shift
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dramatically if one is holding the print under different light sources) with
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profiles, but I am looking for a way to profile my machine so I can have a
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match with my (calibrated) monitor in 6500 K or daylight. At the moment my
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prints have a horrible green cast in 6500 K or daylight with using the
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Standard Epson ICC profile and without making a strong Magenta adjustment in
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Photoshop
One rather cool thing about the Gretag Spectrolino is the interchangeable
filters. I'm always using the UV filter mounted on the head for doing inkjet
profiles. They also provide a D65 filter that may be great for your purposes
since I *assume* this would tune or bias the profile to be correct under D65
viewing conditions like you mentioned. Just a thought.
Oh, and I found the canned Epson profiles that got installed with the Epson
driver to be totally useless. As soon as I created my own, things were fine.
You're right about the color shifts. I'm keeping everything in my little
desktop 5K GTI viewing booth which seems OK but they go whacko when viewed
under any other light. Oddly, when viewed under tungsten they seem pretty
consistent with my viewer. They actually seem to shift the most when I
actually take them outside under "true" daylight conditions. Go figure.
Bottom line is, I think after you create the initial profile you're going to
have to edit the * out of it and create a different profile tuned to each
different light source the print may be viewed under. I'll plug a Gretag
product here and mention they make a great viewer for this purpose called
the Judge III that has several light sources in it: 5K, 6.5K, "office"
fluorescent and tungsten to name a few.
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They have two different versions: Best Photo edition and Best Designer
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edition M.
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Does have anybody experience with those Rips9s? Or with Best?
I'll be starting my testing today with the BESTColor Medium RIP I have here.
I'll keep the list "posted"! ;-)
Later,
Terry