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: Derek Lambert <email@hidden>
- Date: Fri, 21 Jan 2011 13:11:13 -0500
-3 Celsius is not THAT cold Roger!
Best regards,
Derek Lambert
On Jan 21, 2011, at 11:53 AM, Roger Breton <email@hidden> wrote:
> 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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