[argyllcms] Re: Is the i1D3 (ColorMunki Display) accurate?

  • From: Stephen T <stwebvanuatu@xxxxxxxxxxxx>
  • To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
  • Date: Thu, 26 Jul 2012 18:57:18 -0700 (PDT)

Hello Janos,
 
Thankyou for your constructive advice.
 
There are two issues: 1) accuracy and 2) unit-to-unit variability:
 
http://www.drycreekphoto.com/Learn/Calibration/MonitorCalibrationHardware.html ;

OEM i1D2 variability DE00 = 4 - 7, average white point accuracy DE00 = 2 - 4
i1D3 variability DE00 = 0.4 - 2, average white point accuracy DE00 = 2 - 3
 
In the worst case, any two instruments might disagree by DE00 = 2 + 7 = 9.
My results show a  difference of DE00 = 12.
I also measured white patches with spotread and calculate DE94 = 14.
I suppose that luminance measurements are fairly robust and my i1D3 does appear 
to be an odd unit in two tests.
 
I think my i1D3 is measuring out of tolerance?
Has anyone else experienced similar and have they measured the difference?
 
I'm not throwing my Spyder2 in the bin just yet.
 
Stephen.
  

________________________________
 From: "János, Tóth F." <janos666@xxxxxxxxxx>
To: argyllcms@xxxxxxxxxxxxx 
Sent: Friday, 27 July 2012 7:00 AM
Subject: [argyllcms] Re: Is the i1D3 (ColorMunki Display) accurate?
  

I think you bought a new sensor because you believed it's better than your old. 
Didn't you?


The i1d3 is more accurate in theory. The hardware is better, the corrections 
are smarter. 
Of yourse, it's not "perfect". (Neither any other relatively cheap instruments 
are.) But I guess you will be happy with the i1d3 if the i1d2 was good enough 
for your needs.

2012/7/26 Stephen T <stwebvanuatu@xxxxxxxxxxxx>

Hello,
>
>
>I received my ColorMunki display this week and have been doing some 
>comparisons. It gives different readings to my OEM i1D2.
>
>
>
>I calibrated my wide gamut NEC P221W display with X-Rite's ColorMunki Display 
>software and the following settings:
>native white point (hardware setting), D65, gamma = 2.2, brightness 120 cd/m2 
>(adjusted in hardware), WGCCFL display type (under preferences!), no ambient 
>adjustment, no flare correction. 
>
>
>I then measured the response in Argyll CMS v1.4.0 with the profile loaded in 
>Windows 7. I measured with two instruments: ColorMunki Display and NEC 
>MDSVSENSOR (OEM i1D2). I also measured without the CCSS matrix. The profile 
>was good when measured with the i1D3 and so I believe Argyll CMS is not at 
>fault. The profile was inaccurate when tested with the i1D2.
>
>
>
>Are the i1D3 generic correction matrices accurate? My MDSVSENSOR suggests the 
>white point DE00 = 12 and brightness is 8 cd/m2 brighter. 
>
>
>Has anyone else tested the accuracy of the i1D3 against other instruments, 
>especially spectrophotometer?
>
>
>
>Are the generic correction matrices accurate for some display technologies and 
>inaccurate for others? I assume the MDSVSENSOR is accurate for wide gamut NEC 
>displays. I bought the ColorMunki Display mainly for standard gamut CCFL and 
>WLED displays and now I am hesitant to use it! 
>
>
>Maybe one of my colorimeters is faulty?
>
>
>
>Stephen.
>
>
>Here are the results:
>
>i1D3 + CCSS 
>-----------
---
> 
>C:\Users\Stephen>dispcal -d 1 -y l -X WGCCFLFamily_07Feb11.ccss -r -P 
>0.5,0.5,2.0 
>Place instrument on
 test window. 
>Hit Esc or Q to give up, any other key to continue: 
>Current calibration response: 
>Black level = 0.12 cd/m^2 
>White level = 119.57 cd/m^2 
>Aprox. gamma = 2.18 
>Contrast ratio = 1004:1 
>White chromaticity coordinates 0.3108, 0.3274 
>White    Correlated Color Temperature = 6622K, DE 2K to locus =  4.8 
>White Correlated Daylight Temperature = 6622K, DE 2K to locus =  0.2 
>White        Visual Color Temperature = 6442K, DE 2K to locus =  4.6 
>White     Visual Daylight Temperature = 6614K, DE 2K to locus =  0.2 
>The instrument can be removed from the screen. 
> 
>OEM i1D2 (NEC MDSVSENSOR) 
>-------------------------
------------
> 
>C:\Users\Stephen>dispcal -d 1 -y l -r -P 0.5,0.5,2.0 
>Place instrument on test window. 
>Hit Esc or Q to give up, any other key to continue: 
>Current
 calibration response: 
>Black level = 0.12 cd/m^2 
>White level = 127.53 cd/m^2 
>Aprox. gamma = 2.17 
>Contrast ratio = 1026:1 
>White chromaticity coordinates 0.3135, 0.3503 
>White    Correlated Color Temperature = 6328K, DE 2K to locus = 14.4 
>White Correlated Daylight Temperature = 6321K, DE 2K to locus = 12.0 
>White        Visual Color Temperature = 5810K, DE 2K to locus = 14.1 
>White     Visual Daylight Temperature = 5924K, DE 2K to locus = 11.6 
>The instrument can be removed from the screen.
>
>
>i1D3 
>-----
> 
>C:\Users\Stephen>dispcal -d 1 -y l -r -P 0.5,0.5,2.0 
>Place instrument on test window. 
>Hit Esc or Q to give up, any other key to continue: 
>Current calibration response: 
>Black level = 0.12 cd/m^2 
>White level = 118.54 cd/m^2 
>Aprox. gamma = 2.17 
>Contrast ratio = 1002:1 
>White chromaticity coordinates 0.3013, 0.3325 
>White    Correlated Color Temperature = 7100K, DE 2K to locus = 12.4 
>White Correlated Daylight Temperature = 7090K, DE 2K to locus =  9.6 
>White        Visual Color Temperature = 6517K, DE 2K to locus = 12.0 
>White     Visual Daylight Temperature = 6666K, DE 2K to locus =  9.3 
>The instrument can be removed from the screen. 
>
>
>
>

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