[argyllcms] Re: Calibration issue with colormunki

  • From: Emmanuel Michonneau <emmanuel.michonneau@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sun, 21 Nov 2010 23:29:26 +0100

Thanks for your help Juergen.

I'll try tomorow to acclimatize my munki and to use the black drift
compensation and the ambient light sensor.
Until now i used to set only main features of dispcal : white temp, white
level and gamma.

About your link, what am I suppose to see on the jpg? Currently I see number
from 1 to 8 with the 1 and 2 very sligthly visible.

Best regards,

2010/11/21 Juergen Lilien <jp.lilien@xxxxxxxxxxxxxx>

> Hello Emmanuel,
> Emmanuel Michonneau wrote:
> > Why response curves of colormunki does not start to zero?
> Maybe the black point of your monitor has a slight color cast, or there
> is a problem with temperature related black point drift of the Colormunki.
> It is a good practice to give the Colormunki some time at the screen
> (even an hour is not too long, if you are very demanding/critical) to
> acclimatize to the screen temperature, before starting the measurements.
> You can also try to enable the black level "drift compensation during
> measurements".
> This brings me to the point, that you should tell us about the
> calibration and profiling settings you use in dispcalGUI.
> Have you tried the dispcalGUI "Verify profile" function (tools menu) to
> check the calibration/profile?
> > To illustrate my problem here are 3 screenshot of the same photo with
> > respectively :
> > - no profil : http://emmanuel.michonneau.free.fr/pub/withoutprofil.jpg
> > - Spyder profil :
> http://emmanuel.michonneau.free.fr/pub/spyder_argyll.jpg
> > - Munki profil :
> > http://emmanuel.michonneau.free.fr/pub/colormunki_argyll.jpg
> There are still deep blacks (0,0,0) in the Colormunki sample, so it
> seems to be a different gamma correction applied, but the picture does
> not look necessarily bad to me.
> Maybe it is better to compare a more artificial picture, have a look at:
> http://www.fotocommunity-prints.de/fileadmin/daten/einser.jpg
> > Does the problem comes from my display and its TN panel?
> The 8 Bit (per channel) color resolution is only archived with a FRC (in
> the time domain) dithering stage, so it should be better to enable the
> adaptive mode to use the longest possible integration time.
> By the way, have you disabled the ambient light sensor of the monitor?
> Best regards, Juergen

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