[argyllcms] Re: Display calibration

  • From: Frédéric Mantegazza <frederic.mantegazza@xxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sun, 2 Dec 2007 18:23:46 +0100

On dimanche 02 décembre 2007, Rolf Gierling wrote:

> Hi Frédéric, hi Graeme,
>
> >>> Initial native brightness target = 80.845374 cd/m^2
> >>> Had to scale brightness from 80.845374 to 80.818901 to fit within
> >>> gamut Target white value is XYZ 40.724326 80.818901 84.670188
> >>
> >> Notice the strange X value - this is because you've let dispcal
> >> calibrate to the native white point, and you've set your native white
> >> point to be extremely green.
>
> Graeme,
> 
> XYZ 40 80 84 is not only a green cast, this is so green it can't be
> overseen.
>
> Frédéric,
> if you have an i1 display 2, it should have come with an ambient
> light head.
> (that milky white transparent plastic thing that is not easy to remove)
> Try using argylls spotread and measure a simple incandescent light bulb
> (not halogen, not fluorescent) :
>
> spotread -a
>
> adjust the distance until you get dimensions like mine, esp. a L
> value around 80:
>
> Result is XYZ: 69.468412 58.173981 12.077657, D50 Lab: 80.835422
> 30.845398 61.545526
> Ambient = 182.8 Lux, CCT = 2292K (Delta E 1.635531)
> Closest Planckian temperature = 2279K (Delta E 0.870795)
> Closest Daylight temperature  = 2244K (Delta E 22.234008)
>
> if your X value is far off, ie. only in the dimension of 45 or lower,
> and spotread tells you something of a temperature around 4400K or higher, 
> chances are good your instrument is faulthy.

Thanks, Rolf. I gave the i1 to a friend: he will test it under a native XP, 
and also under Linux (with a different machine than mine). I'll ask him to 
do you test...

I'll let you know what we find.

Regards,

-- 
   Frédéric

   http://www.gbiloba.org


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