[argyllcms] Re: White point or black point adjustment not working
- From: George Willegers <george@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 19 Jul 2009 17:51:56 +0200
Klaus Karcher schreef:
George Willegers wrote:
I am trying to adjust my display (Eizo L568 LCD)
A good choice (I am familiar with the Eizo L768 and I'm happy with it)
I'm a little less happier with it, since at work I am using a 21"
1600x1200 display, so I am considering buying a larger one ;-)
Maybe an Eizo S2431, it gets good reviews.
When I try to set the white point or the black point (options 2 and 4
of the menu shown by dispcal -ly -v), the following happens:
- measurements are done
- I am asked to adjust the R, G and B offsets
the Eizo has no offset controls AFAIK -- you can only adjust the
whitepoint with the RGB (gain) controls.
So I should only take steps 2 and 3 of dispcal (white point and white
level)? That leaves me with a pink sort of white. Colour temperature is
set to 6500K.
[...]
Target white brightness = native brightness
[...]
Doing some initial measurements
[...]
White = XYZ 29.51 34.26 33.78
... the brightness seems /very/ low to me. Are you sure your
measurement device is OK? Do you really aim for 34 cd/m^2 ? I guess
it's difficult to get stable backlight conditions at this low level.
That's what came out after doing steps 1, 2, 3 and 4 of dispcal. The
brightness looked too low to me, I think I misinterpreted the
instruction of step 3.
After just doing 2 and 3 I now have the following (apart from white
looking like pink):
Black = XYZ 0.25 0.20 0.29
Grey = XYZ 24.66 26.08 29.56
White = XYZ 113.08 119.22 137.37
1% = XYZ 1.58 1.65 1.99
Current Brightness = 119.22
Target 50% Level = 22.59, Current = 26.08, error = 2.9%
Target Near Black = 1.19, Current = 1.73, error = 0.5%
Current white = x 0.3059, y 0.3225, VDT 6941K DE 0.3
Target black = x 0.3059, y 0.3225, Current = x 0.3028, y 0.3160, error
= 3.65 DE
When adjusting the white point, it started with R+ G-- B+. After
decreasing the green level a bit this changed into the reverse (R- G++
B-), sometimes changing into R= G= B= without touching the monitor
controls. I still think this is odd.
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