Re: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
Re: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- Subject: Re: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- From: Steve Upton <email@hidden>
- Date: Fri, 21 Jan 2011 10:14:04 -0800
At 11:53 AM -0500 1/21/11, Roger Breton wrote:
>Hi everyone,
Hi Roger!
>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)
this wouldn't be too hard to create as a new target in ColorPort would it? or am I missing something?
>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?
As long as you don't need the UV-included measurements you can read it in one pass. I think if you set the software so as to only take UV-cut measurements, it will only do one pass. I know we can control the drivers to do this in our ColorShuttle software.
>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 /
that's not a bad winter day! We had one of the coldest days I can remember here in Seattle yesterday and it was a balmy 6 C (42 F). It must have been the humidity or something but it chilled to the bone (I grew up in Calgary with cold snaps down to the -30's, so I'm no stranger to cold... perhaps I'm just getting old)
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
________________________________________________________________________
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