[argyllcms] Re: Bad measurements & white point calibration with Argyll 0.7b7 and GretagMacbeth i1Display 2
- From: Craig Ringer <craig@xxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 11 Jan 2008 00:54:03 +0900
Graeme Gill wrote:
> Craig Ringer wrote:
>
>> $ dispcal -r -y l
>> Place instrument on test window.
>> Hit Esc, ^C or Q to give up, any other key to continue:
>> Current calibration response:
>> Black level = 0.19 cd/m^2
>> White level = 2.30 cd/m^2
>> Aprox. gamma = 2.23
>> Contrast ratio = 12:1
>> White chromaticity coordinates 0.3176, 0.3404
>> White Correlated Color Temperature = 6187K, DE to locus = 8.5
>> White Correlated Daylight Temperature = 6186K, DE to locus = 4.8
>> White Visual Color Temperature = 5911K, DE to locus = 8.3
>> White Visual Daylight Temperature = 6043K, DE to locus = 4.6
>> The instrument can be removed from the screen.
>
> Obviously something drastic is wrong.
>
> From your file 2407_D65_G2.2_Bunset.calib_log, the command line was:
>
> bin/dispcal -v -y l -t 6500 -b 2.2 calib
*beats head against wall*
That'll be it. Even though I checked explicitly for it - or thought I
did - when I noticed the eventual brightness value being so suspiciously
close to 2.2 .
What a stupid waste of time. Sorry.
Now I'm left wondering why, with -b 2.2, I get similar results to lprof
set to native display brightness. I'll have to see what it's aiming for.
--
Craig Ringer
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