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LG 32EP950-B peak white calibration issue

 
Author andrewhueb
ZRO
Male
#1 | Posted: 19 May 2023 17:27 
Hello,

Calibrating a new LG 32EP950-B for SDR/REC-709/2.4/100 nits, using ColourSpace LTE.

I'm having difficulty reaching the peak white level of 100 nits post-calibration. Here is my process:

- Reset monitor to "initial settings", verified firmware remained at 3.20
- Put monitor into "calibration mode", full range
- Set brightness to "20", which put peak white (255) at around 110 nits (Measured headroom to account for white balance shift).
- Profiled 32EP950-B display with a Grey Ramp RGB using i1d3 OEM (no Probe match, as I am simply trying to achieve proper peak white during verification after 3D LUT)
- Create 3D LUT, load and verify again using same settings/Grey Ramp RGB
- No Blackmagic test pattern or gear involved -- both the profile and verification utilized only the internal LG TPG.

Results: in spite of setting 255 target at 100 nits, and measured pre-cal peak white at 110, post-cal level is 85 nits. I initially used the BMD and Assimilate TPGs, but results were the same, hence using the LG TPG and trying to rule out anything in my signal chain.

Pre-cal, post-cal, and 3D LUT attached as zipped file. Appreciate any guidance!

Andrew

LG32EP950-B tests.zip Attached file:
Zipped file containing pre and post bcs files, LUT

 

Author ConnecTED
LTE
#2 | Posted: 23 May 2023 07:27 

Author Steve

INF
Male
#3 | Posted: 21 Feb 2024 12:44 
The next ColourSpace release will have LG's fix for this issue.
(We have just implemented and verified in our latest internal dev. build.)
That will make all LT Pro monitor firmware versions operate the same with regard to ABL, when being calibrated with ColourSpace.

Steve
Steve Shaw
Mob Boss at Light Illusion

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Display Calibration Light Illusion Forums / Display Calibration /
 LG 32EP950-B peak white calibration issue

 

 
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