[argyllcms] Re: ColorMunki measurement drift

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 28 Sep 2010 15:09:21 +1000

Juergen Lilien wrote:
I would consider the temperature of a CRT tube as very cool (isolating
vacuum), compared to a LCD screen with backlight, so I'm really
astonished that even with a CRT there is such a long lasting drift.

A CRT gets warm due to the energy of the electrons hitting the phosphor.
(It's noticeably warm to the touch.)

The smaller temperature difference (room temperature<->CRT) should
result in a lower drift, so this does not signify that your
ColorMunki is better/less prone to drift, right?

Recalibrating does not seem to affect this.

This means that your ColorMunki is also not back to its first readings
after a self-calibration?

I'm not sure what you mean. Recalibration didn't affect the measurements
after it had all stabilized.

This reminds me of the question, if it is possible that the temporal
dithering used in panels to gain 10 Bit resolution is jointly
responsible for measurement variance?

It's a possibility. Instruments like the DTP94 had special
circuits to synchronize their readings with the CRT refresh. Recent
instruments have dropped this level of sophistication on the assumption
that LCD displays don't flicker. Maybe that's not a perfect assumption.

Graeme Gill.

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