[argyllcms] Re: Eye-one and DTP94 using dispcal
- From: Roger Breton <graxx@xxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 02 Aug 2008 10:34:11 -0400
Hi Martin,
Thank's for these interesting results.
Had you requested different "brightness" targets from dispcal from one
instrument to the other? I am surprised that the DTP94 reports 149.95 cd/m2
as opposed to 194.82 for the EyeOne.
As far as calibrated chromaticities, the difference is not too extreme.
Is it Argyll that requests "placing the black cap" on?
If you are doing emissive readings (monitor calibration and profile), I
don't see why the instrument would need to be calibrated for ambiant
readings. Unless there is an option that you checked, somewhere, for
checking ambiant readings at the time of calibration.
Roger Breton
> I'm using dispcal -r using both DTP94 and eye-one pro on a Mac. The results
> differ pretty much in white level and temperature.
>
> DTP94 results:
> Current calibration response:
> Black level = 0.41 cd/m^2
> White level = 149.95 cd/m^2
> Aprox. gamma = 2.37
> Contrast ratio = 366:1
> White chromaticity coordinates 0.3474, 0.3612
> White Correlated Color Temperature = 4947K, DE to locus = 5.6
> White Correlated Daylight Temperature = 4948K, DE to locus = 1.1
> White Visual Color Temperature = 4832K, DE to locus = 5.4
> White Visual Daylight Temperature = 4929K, DE to locus = 1.0
> Effective LUT entry depth seems to be -1073742664 bits
>
> eye-one results:
> Current calibration response:
> Black level = 0.49 cd/m^2
> White level = 194.82 cd/m^2
> Aprox. gamma = 2.37
> Contrast ratio = 400:1
> White chromaticity coordinates 0.3408, 0.3601
> White Correlated Color Temperature = 5187K, DE to locus = 8.0
> White Correlated Daylight Temperature = 5190K, DE to locus = 4.1
> White Visual Color Temperature = 5003K, DE to locus = 7.8
> White Visual Daylight Temperature = 5106K, DE to locus = 4.0
> Effective LUT entry depth seems to be -1073742664 bits
>
> Using basiccoler display I think the DTP94 readings are ok.
>
> First thing to check is how to perform instrument calibration. To me
> calibration of the DTP94 is straight forward. Putting it on a dark surface and
> go. But I'm not sure about the eye-one. Setting the -K option I'm prompted to
> put the eye-one on the reference, ok. Then, this pops up "Place cap on the
> instrument, or place in on a dark surface, or place on the white calibration
> reference". What should I do now? I've tried the white reference and the dark
> cap, same results. Other software (basiccolor display, monaco optix) only use
> the white reference.
>
> Any help is appreciated.
>
> Martin Weberg
>
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