[argyllcms] Re: problems hitting white point (color temperature, RGB gain/contrast) while maintaining brightness: dE not stable

  • From: Martin Weberg <martin.weberg@xxxxxxxxx>
  • To: argyllcms <argyllcms@xxxxxxxxxxxxx>
  • Date: Fri, 11 Dec 2009 12:27:47 +0100

Hi David

2009/12/10 David Heinrich <dh003i@xxxxxxxxx>:
> =============
> Contrast 100
> Brightness 48
> R bright 98
> G bright 75
> B bright 100
> R contrast 100
> G contrast 60
> B contrast 58

This is my calibration precedure:

Return to factory defaults or similar.
I usually don't move contrast settings.
Then set brightness to something like 75% (or lower if your eyes are
burning) to have some room to play.
Then set all RGB channels to around 50%.
If the display appears too bright lower the brightness. If too dim
raise all RGB channels and maybe brightness. Be sure not to hit 100%
or just below it.

Now set the RGB channels to the desired white point using dispcal,
ignore brightness. Then, try to match the brightness by altering the
brightness control. If you are approaching 100% brightness pull back a
bit and raise all R, G, B instead. Then, adjust white point again and
brightness iteratively. If both brightness and one of the R, G, B
channels are maxed you cannot meet your desired brightness target.
Change target or display :-)

I hope this makes sense.

Martin Weberg

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