Re: Eye One Pro for monitor calibration? [was: Re: NEC 2690 SpectraView]
Re: Eye One Pro for monitor calibration? [was: Re: NEC 2690 SpectraView]
- Subject: Re: Eye One Pro for monitor calibration? [was: Re: NEC 2690 SpectraView]
- From: Klaus Karcher <email@hidden>
- Date: Sat, 01 Dec 2007 10:58:04 +0100
Joseph Yates wrote:
I've also been using the EyeOne Pro (Rev B) with an Eizo CG210 - first with
Eizo's supplied Color Navigator - and now with BasICColor Display 4 - using
it's 10-bit LUT hardware calibration.
Using BasICColor Display's verification mode - I am getting results of
deltaE94 - Avg. (0.34) / Max (0.76) / Std Dev. (.19)
Target white Point D50
- Achieved (a -0.2) (b -0.2)
Luminance White Target 130 cd/m
- Achieved (129 cd/m)
Luminance Black Target Min. Neutral
- Achieved (0.57 cd/m)
While these results appear very good to me - in fact the Validation Results
of BasICColor Display has all the color bars well within the Green "Good"
area - how can I be sure that another Spectro/Colorimeter and/or Display
software will NOT improve the calibration even more?
Well ... you could /use/ another instrument (e.g. one of those cited
35k$ reference spectroradiometers) and compare the results ;-)
I's somewhat misleading to use a instrument to verify it's own results:
It will only show weather the measurements are repeatable and the
calibration and profiling process is consistent in itself. -- The test
won't reveal systematic discrepancies of the instrument. E.g. if your
instrument's measurements are always too blue, your monitor will show a
yellow cast, but the verification won't reveal a color cast.
Beside's BasICColor Validation results - what other tests do those out there
conduct to insure they are getting the most optimal results from their
monitor/hardware calibrator/software?
I've also run CGS ORIS Certified Proof - Measure Monitor mode - for FOGRA
ISO Coated V2 - which we use for our press proofs - and the Monitor Colors
were out of Tolerance! (Maximum & Primary colors >15 deltaE2000)
Curious why - if BasICColors Validation numbers are correct - why doesn't
the Eizo pass the ORIS measurements?
Figures like this are quite usual with non-wide-gamut displays like the
CG210.
What you did with BasICColor Display's verification is to compare your
display with your display. The results show how precisely your display
can reproduce colors that fall within it's own gamut.
What you did with the ORIS tool is to compare your display with a
standardized offset press. As long as the tested colors are within your
display gamut, the deviations should be within the same order of
magnitude as the BasICColor results -- but the gamut of ISO Coated v2
pokes out of your display gamut widely, especially in the cyan and green
region.
You can check this visually, e.g. with a gradient from 45% black to 100%
cyan: it will look evenly and smooth on press (or in a good proof), but
it will be clipped abruptly on screen.
You can also check this with a 3D gamut viewer, e.g. <http:/iccview.de>:
you can see that the can and green region of the Offset press pokes out
of typical display gamuts (roughly sRGB) a good deal.
Regards,
Klaus
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