[argyllcms] Re: Display calibration

  • From: Frédéric Mantegazza <frederic.mantegazza@xxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 1 Dec 2007 15:37:22 +0100

On samedi 01 décembre 2007, Graeme Gill wrote:

> Frédéric Mantegazza wrote:

> > 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+
> You need to sanity check it. Does the white of the display actually
> look green ? If not, then there is some problem with the instrument
> and readings. What instrument is it ?

Yes, when using default 6500K white point, there is a little green color 
cast. But as soon as I load the LUT from the generated profile, using 
dispwin, the colors looks good: greys are greys. So, I think the 
instrument is OK.

The problems occure when the color engine (all my softwares under Linux are 
based on LCMS) use the profile. I tried to profile my laptop LCD, and I 
got the same problem.

I'm using the Eye-One Display 2.

What happens if you use my profile ? Do you see this red saturation? Could 
it be better if I use a very large numbers of patchs (say 1000), and 
generate a table, instead of a matrix?



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