Re: Eye-One factory recalibration and Xrite Support
Re: Eye-One factory recalibration and Xrite Support
- Subject: Re: Eye-One factory recalibration and Xrite Support
- From: Todd Shirley <email@hidden>
- Date: Wed, 9 Jul 2008 22:16:10 -0400
On Jul 9, 2008, at 4:36 PM, Lorenzo Ridolfi wrote:
I was planning to use my eye-one to validate some proofs made with
my Isis but it surely won't work!
Hi Lorenzo
I've got several proofing queues made with an Isis (using ORIS
ColorTuner) and I validate proofs with an eye-one all the time.
According to the Isis, my compliance to GRACoL is avg. dE of around
0.6 with a max of about 3 (on an IT8.7/4 chart). According to the eye-
one, my compliance to GRACoL is avg is around 2 and my max patch is
about 4.5. So, my proofs don't look like they are super compliant, but
I always get in under the ISO 12647-7 tolerances! So it "works", but
suddenly it becomes clear why the tolerances are as high as they are.
If you are getting 4dE difference between your eye-one and Isis,
something is definitely off. Are you definitely using the same UV
filtration on both? If you are taking both readings with UV included,
and your stock has a lot of optical brighteners, that might increase
the dE between the 2 devices. I don't know if others have experienced
this, but I've found that the Isis only "sees" optical brighteners as
making the paper bluer, not brighter. So the difference between UVcut
and UVin on the Isis can be up to 7 for the b value but no difference
for the L value. My UVcut eye-one is about 1.5 dE different for paper
white when compared to the UVcut Isis, but when I've used a UVin eye-
one and compared it to the UVin measurements from the Isis my
difference can range from 2 to 5, depending on the amount of OB. Eye-
ones "see" optical brighteners as increasing the L value as well as
decreasing the b value.
Wow, that came out a lot longer than I had originally planned. Keep in
mind that I've only used one Isis and 3 different eye-ones, so my
results are far from conclusive. Just thought I'd share my personal
experience with these two devices.
-Todd Shirley
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