[argyllcms] Re: Display calibration
- From: Frédéric Mantegazza <frederic.mantegazza@xxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 1 Dec 2007 14:44:25 +0100
On samedi 01 décembre 2007, Graeme Gill wrote:
> > Adjust R,G & B gain to desired white point. Press space when done.
> > Initial B 110.80, x 0.1985, y 0.3899, VDT 6762K DE 30.2
> > / Current B 110.72, x 0.1984, y 0.3907 VDT 6753K DE 30.2 R+ G-- B+
>
> Note the white point is correlated to 6753K with a delta E of 30 ! This
> means that the white point is far from actually being at 6753K, merely
> that 6753K is the closest daylight temperature to the actual white
> point.
>
> If you want to actually have a white point lying on the daylight
> temperature locus, you need to adjust the RGB gain controls so as to
> reduce the delta E to near zero. Notice that the interface is suggesting
> you reduce green to move the white point in the right direction, or
> possibly increase Red and Blue.
Well, There is something strange... I can't adjust the white point. Even if
I increase Red and Blue to the max (I don't have Green gain control), I'm
still far for the correct value (dE ~ 24). But the image looks hugly, and
the temperature goes to 11500K!
Adjust R,G & B gain to desired white point. Press space when done.
Initial B 79.87, x 0.1974, y 0.3924, VDT 6733K DE 30.4
/ Current B 120.85, x 0.1946, y 0.2525 VDT 11523K DE 23.5 R+ G-- B+
What am I doing wrong?
--
Frédéric
http://www.gbiloba.org
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