[argyllcms] How about the following result for Samsung XL20

I tried to incorporate the different comments about
calibrating/profiling my Samsung Xl20, and I came up with the following.

I put the monitor in Custom Mode.

I used dipscal -r to read settings while trying different adjustments.

I left contrast at the default of 80 and adjusted the Brightness
downward to a more comfortable level.  I finally set it at 20.

I left all the other settings at the defaults because modifying them
seemed to make bigger changes than I wanted.

I used dispcal -o -g 2.2 TargetBa and went directly to the Step 7,
calibration.

Then I used dispcal -r

Here is the result after doing dispwin -I

$ dispcal -r
Place cap on the instrument, or place in on a dark surface,
or place on the white calibration reference,
 and then hit any key to continue,
 or hit Esc, ^C or Q to abort:
Calibration complete

Place instrument on test window.
Hit Esc, ^C or Q to give up, any other key to continue:
Current calibration response:
Black level = 0.21 cd/m^2
White level = 127.94 cd/m^2
Aprox. gamma = 2.19
Contrast ratio = 601:1
White chromaticity coordinates 0.3080, 0.3322
White    Correlated Color Temperature = 6731K, DE to locus =  9.2
White Correlated Daylight Temperature = 6726K, DE to locus =  5.7
White        Visual Color Temperature = 6362K, DE to locus =  8.9
White     Visual Daylight Temperature = 6515K, DE to locus =  5.4
The instrument can be removed from the screen.

>From previous attempts, I know I can get the white chromaticity closer
to 0.33, 0.33, with smaller DEs to locus, by adjusting the R, G, B
settings.   Is that worth doing?

One other comment.   The monitor has an `Indicator' setting, which
accoring to the user's guide doesTurns all LEDs On or Off. If it seems
that the light from the
"LEDs affects the brightness of the LCD, you can turn off
the power to them by setting the Indicator to Off. When
setting it to On again, all LEDs will again operate in
accordance with the change in monitor status."

I'm not sure I understand this, but I did it anyway.  Nothing very
obvious happened when I went to off and than back to on.  

I was having a subtle problem.   I was seeing slight variation in tint
and other artifacts in my desktop background gray.  I wasn't sure if it
is actually there or the result of some color adaptation in my eyes
since what I say changed when I closed one eye or the other.  But after
using the Indicator, uniformity may have improved somewhat.  

I've noticed similar artifacts on other LCD screens.   Has anyone else
seen anything like this?


-- 
Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
Mathematics Department, Northwestern University

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