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OLED oversaturation issue

 
Author Vassily
ZRO
#1 | Posted: 29 Jan 2014 13:45 | Edited by: Vassily 
Hi everyone,
I had a chance to play little bit with the sony OLED PVM-2541A monitor. I measured 21 point cube size profile (it took over 6 hours by K10-A set to average black ). All primary colors dots (excepting the first point of each primary color ramp which is 3.5% of brightness and probably the probe error) are outside of Rec709 gamut. So, I am expecting to have a very accurate calibration. Below is the screenshot of the native OLED gamut (if i am successfull to post the image).


But when I create a calibration to Rec709 LUT and re-profile the monitor (only 16 size cube, did not have enough time) I see that low light points of the primaries are outside of Rec709 gamut. I wonder why my LUT is not able to bring all colors to exactly match the target?

Author Steve

INF
Male
#2 | Posted: 29 Jan 2014 14:25 
I would guess at confusing data and TV legal levels.

LightSpace will indeed accurately calibrate the full range.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Vassily
ZRO
#3 | Posted: 29 Jan 2014 14:46 
I think no. Patches were generating by Pluto with data to TV active LUT and measured gamma curve looks perfect which I guess confirms the levels are correct.

Author Steve

INF
Male
#4 | Posted: 29 Jan 2014 14:50 
We have indeed heard of Issues with Pluto, with it not scaling correctly between levels when setup incorrectly.

Run checks with the Pluto out of the loop.

Try using the inbuilt 'Active LUT' function within LightSpace - that's what it's there for

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Vassily
ZRO
#5 | Posted: 29 Jan 2014 15:06 
I know. It was me one of the person from whom you have heard about the issues with Pluto But later I have found the correct settings and always have the same result either active LUT in Pluto or in the LightSpace

Author Vassily
ZRO
#6 | Posted: 29 Jan 2014 15:25 
probably I had to increase monitor's brightness little bit to lift the common black level. The 0.0008 Nits of black which I have is too low and maybe I am experiencing some probe issue although the K10-A should get this level.

Author Steve

INF
Male
#7 | Posted: 29 Jan 2014 15:34 
It's unlikely to be the LUT.

I would expect when the LUT and image data are being scaled within Pluto the below 16 and above 235 are being bypassed.

that means any image data outside those values will not be corrected.

This is different to the issues you reported a while back.

Take the Pluto totally out of the loop and try again. Very likely you will see a different result.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author Vassily
ZRO
#8 | Posted: 29 Jan 2014 15:40 
do not have other patch generator..
I wish I tried HDMI but I did not. The monitor is not in my hands now..

Display Calibration Light Illusion Forums / Display Calibration /
 OLED oversaturation issue

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