Re- i1 concerns.
Re- i1 concerns.
- Subject: Re- i1 concerns.
- From: "Michael Lithgow from Colourhead" <email@hidden>
- Date: Thu, 10 Jul 2003 17:01:20 +1000
- Organization: Colourhead Digital Colour Management Services
Michael Lithgow from Colourhead wrote...
>
The only way I could get an acceptable result on the iMac was to choose
Native Whitepoint using the spectro and the
>
improvement was quite dramatic, however this results in a Whitepoint
colour temp. of around 9300k. Of further interest was >that while
considerably better results were obtained using the Eye One spectro even
this combo resulted in inconsistency
>
on the iMac. I should point out that ProfileMaker Pro does a very
acceptable job of the same iMac using the spectro and
>
can nail it the same every time, as does numerous other calibration
solutions. It therefore seems that the i1Display
>
colorimeter is not much good with CRTs and that i1Match itself has
problems as even with the spectro it was below par when >asked to
calibrate at other than native whitepoint.
Since my first post I have tested further and discovered that the
problem is not with the colorimeter but with i1Match. The poor
calibrations and inconsistency between calibrations have been cured
using the i1Display colorimeter in conjunction with ProfileMaker Pro.
While this does nothing to help users of i1Match it at least shows that
the colorimeter itself is capable of doing the job. In PM4.1.5
sequential calibrations gave a Delta E-94 of <2. With i1Match I didn't
even bother to make Delta E comparisons, it wasn't necessary. Remember
the problems occurred on an iMac CRT monitor without RGB controls and
when requesting a Whitepoint of 6500k, requiring all the colour temp
adjustment to be done via the calibration software. I make mention of
this because anyone attempting to replicate my results on a quality
monitor and using hardware controls is unlikely to encounter the
problem.
While using ProfileMaker Pro resulted in consistent calibrations on the
iMac be aware that the i1 Display colorimeter on an iMac (which only has
software adjustments for contrast and brightness) and PM4.1.5 is a
combination that would test the patience of a saint. Flicking back and
forward from PM to the monitor control panel is painstakingly slow to
the point where it eventually stops. I ended up using my own methods for
determining contrast and brightness settings and then let ProfileMaker
take over. The i1 spectro is a far quicker and more successful combo. I
noticed that even using PM on a quality monitor with RGB controls, the
pointers were much more stable using the spectro, but in all fairness a
little patience in this area and the colorimeter delivered equal
results.
Darrian Young wrote...
>
This behavior that you mention above has been seen in other parts of
the world as well. As you have the spectro as well
>
as the colorimeter, you have been able to compare with both which is an
interesting exercise. I will be looking forward
>
to the following posts explaining why theoretically a colorimeter is
better for calibrating a monitor despite the fact >that the results
show you that with the i1, the results improve.
>
If you repeat the exercise with LCDs, the results will be similar.
My issue was never a colorimeter versus spectro one as I use
colorimeters regularly and am very satisfied with the results. The
Sequel unit with ProveIt and Profile City and the Spyder with PhotoCal
and Optical all deliver consistent results. In fact with reference to
the iMac there is nothing out there that suits this unit better than the
Spyder with PhotoCal as PhotoCal places the contrast and brightness
controls within the calibration application.
Andrew Rodney wrote...
>
This goes against all the test I (and several others) have done with
the EyeOne Display and EyeOne Spectrophotometer (I
>
have both and did work on several CRTs with both) and found the results
to be (as far as I can see) identical. Of course I >was using a pretty
decent display...
If you have the time could I suggest you try calibrating your monitor to
9300k using hardware RGB controls and repeating the calibration but this
time requesting 6500k and not adjusting the RGB gun controls, forcing
the correction to be all done via i1Match, as this appears to be where
i1Match falls down. Obviously this is not how one would calibrate in the
real world given RGB gun controls but this would be the best way to
replicate the situation I found on the iMac.
All I can say is bring on i1Match 2.0.3.
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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