Re-i1 Display concerns.
Re-i1 Display concerns.
- Subject: Re-i1 Display concerns.
- From: "Michael Lithgow from Colourhead" <email@hidden>
- Date: Fri, 11 Jul 2003 12:27:49 +1000
- Organization: Colourhead Digital Colour Management Services
>
Michael Lithgow from Colourhead wrote...
>
>
Since my first post I have tested further and discovered that the
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problem is not with the colorimeter but with i1Match. The poor
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calibrations and inconsistency between calibrations have been cured
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using the i1Display colorimeter in conjunction with ProfileMaker Pro.
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While this does nothing to help users of i1Match it at least shows
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that the colorimeter itself is capable of doing the job.
Darrian Young replied...
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In the theoretical case in which someone had the same type of problems
with ProfileMaker or other software, what
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conclusion would you reach?
I would then have to do tests as I have done in this case to isolate
whether the problem was hardware or software. In such a theoretical case
as you mention and given that I haven't seen the same sort of problems
in ProfileMaker my suspicions would naturally go against the hardware.
Colourhead wrote....
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I make mention of
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this because anyone attempting to replicate my results on a quality
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monitor and using hardware controls is unlikely to encounter the
>
problem.
Darrain Young replied....
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How do you come to this conclusion. Example, I use a poorf system and
have a problem - I then conclude that with a better >system, there will
probably be no problem. There is something missing here.
I thought I explained that quite well. The problem occurs when using a
monitor with no RGB controls and selecting a whitepoint other than the
default, requiring i1Match to do all the correction, in my case on the
iMac, back from 9300k to 6500k. While I referred to quality monitors and
the use of RGB controls, I should make it clear that I never referred to
poor monitors. I did say the iMac was less than ideal but was still a
good unit. I don't see any point in testing on a poor monitor. In all my
tests using a screen with RGB controls I was able to make 6500k the
Native whitepoint which mean't i1Match didn't have to make a correction
in this area and consequently didn't appear to have a problem.
Colourhead wrote....
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While using ProfileMaker Pro resulted in consistent calibrations on
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the iMac be aware that the i1 Display colorimeter on an iMac (which
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only has software adjustments for contrast and brightness) and PM4.1.5
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is a combination that would test the patience of a saint. Flicking
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back and forward from PM to the monitor control panel is painstakingly
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slow to the point where it eventually stops. I ended up using my own
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methods for determining contrast and brightness settings and then let
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ProfileMaker take over. The i1 spectro is a far quicker and more
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successful combo.
Darrian Young replied....
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Far quicker and more successful... is this an argument for equality of
devices?
Not really what I was getting at but if I had to make a choice in this
case then my preference would be for the spectro. But realise that my
preference here comes at a considerably increased cost.
Colourhead wrote...
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My issue was never a colorimeter versus spectro one as I use
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colorimeters regularly and am very satisfied with the results. The
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Sequel unit with ProveIt and Profile City and the Spyder with PhotoCal
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and Optical all deliver consistent results. In fact with reference to
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the iMac there is nothing out there that suits this unit better than
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the Spyder with PhotoCal as PhotoCal places the contrast and
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brightness controls within the calibration application.
Darrian Young replied....
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Nor was mine. I really don't care what the device is as long as the
results are top quality. If this had been a case of
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results of spectro 1 vs. spectro 2, then this differentiation would not
have been made. By the way, you mention that some >other combinations
give consistent results - are they consistently good or consistently
bad? :-) Just kidding... please
>
everyone don't get all worked up.. just a bit of humor.
Ahh humour, an often neglected area in colour management.
Colourhead wrote...
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All I can say is bring on i1Match 2.0.3.
Darrian Young replied....
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Although new discoveries should be taken into consideration, it may be
a bit hasty to say that a 2.0.3 will solve a
>
problem. Probably much more testing is needed as yesterday, it appeared
to be a problem of the i1 Display unit from your
>
side (now apparently not so) , and from the States?? no problem at all.
>
Let's see what happens.
I feel my tests have for the most part eliminated the colorimeter as the
cause of the problem despite my initial belief being that this was
probably the culprit. I still think I may have something with my
thoughts on the light being over restricted to the sensor and this may
well be why the colorimeter is so much slower than the spectro. The
jumpy pointers would also point to this and there is still the question
of the difference in requested RGB gun adjustment between spectro and
i1Display colorimeter. I did not realise until yesterday that the i1
Display colorimeter was supported in ProfileMaker, if I had known this I
would have tested this combination much earlier.
Given the seriousness of this problem I would sincerely hope that it
would be fixed in the next update. I received an e-mail off list that
suggested that Gretag are currently working on improvements for i1Match
and have a "fix" that reduces the full screen colour samples to a much
smaller area. While this may reduce some inconsistency I doubt this will
be the cure for the problems I have outlined. The extra load on the guns
when producing full screen swatches would be the same regardless of
whether a colorimeter or spectro was used and this problem seems to
revolve around software whitepoint correction, as I mentioned choosing
native whitepoint appears to fix the problem.
Like you I am surprised more hasn't been said of this problem on the
list and I can only assume the cost of monitors in the States is such
that everyone has quality units. Actually I must say that even the
cheapest monitors seem to have RGB controls these days. However Imacs
must be in common use everywhere and it is seldom that when on-site I
don't get asked to calibrate an iMac. It always seems to be that I get
asked to calibrate one or two more monitors that get used for "the
occasional job". CRT iMacs are great little machines, although somewhat
small for graphics work I have successfully calibrated many for clients
and the match from screen to print has been very good using PhotoCal and
a Spyder. Hopefully Gretag will resolve the current issue soon.
Michael Lithgow
Colourhead Digital Colour Management Services
Glen Waverley
Vic. 3150
Australia
Ph/Fax (03) 9511 5031
Mobile 0425 719413
email@hidden
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