Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- Subject: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- From: Roger Breton <email@hidden>
- Date: Fri, 21 Jan 2011 11:53:45 -0500
Hi everyone,
Two questions, if I may.
A) Are there target descriptions XMLs anywhere, hidden, that would allow
reading standard IT8.7/4 Random using the iSisXL in ColorPort 2.0? (I
thought I looked around carefully but cannot find any)
In case you wonder, I'm fully aware that MeasureTool allows such a feat, but
with a small limitation. Which brings me to my second question of the day...
B) Is there a way to drive the instrument to obtain the readings in *one
pass*?
Please Mr. X-Rite, excuse my ignorance but I never knew how the iSis creates
its measurements internally. I know, this issue was raised in the past on
the List and I distinctly remember Terry's post about how he like to average
the two sets of readings off the instrument, to compensate for optical
brighteners, and Marc Levine's ensuing reply. So the issue sort of came up
for discussion, once in the past. True. But here's the problem -- my
problem, really. To measure a standard IT8.7/4 Random chart on the iSisXL
almost takes 10 minutes. 10 minutes may not sound like much when color
managing an inkjet printer. But 10 minutes is a lot of time when trying to
color manage a reluctant printing press. So, I am trying to find a way
whereby I could cut that time down, possibly, to less than 10 minutes,
ideally in half that time in an effort to allow more measurements per hour
and coming to better averaging -- I'm a firm believer in statistical
analysis. Now, for anyone familiar with the iSis, it is plain to see that
the instrument makes two passes at each row, in a given chart, to get at the
final reading, one pass with a White LED illumination and another pass using
a "UV LED" illumination (for lack of better words). What I would like to
know is, are these two passes actually necessary to yield a complete, valid
measurement? Is the instrument SDK doing anything to the two sets of
measurements on the way in to a host application? Or are these two sets of
measurements more or less independent of each other, assuming a paper free
of any optical brightener (this is a very important prerequisite). In
principle, when measuring such a paper using ProfileMaker's MeasureTool
v5.10 under Windows7 64bit, a comparison of the two sets of readings should
not make a difference, should it? But, it wouldn't, in my view, the "UV' or
"Blue LED" light source does not provide full illumination over 380 to
730nm? This is unlike throwing the UV filter on the DTP70 to provide a
"filtered UV-cut" illumination, right?
I realize this maybe more a question for X-Rite technical support but I
thought I'd throw it at the list first ;-)
My warmest regards from a cold, -3 Celcius, winter day in Montreal, Canada /
Roger Breton
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