I personally don’t find any benefit in having two separate SM WB pre-calibrated for SDR and HDR/DV. But there is no downside to doing it either. There is no right or wrong way for this in my opinion.Using Ted's fantastic guide here: LG OLED's 3D LUT Profiling using LightSpace Thread
I only had a clarifying question about this (specifically using ColourSpace & PGenerator on a C9 display) and apologies in advance if it is dumb or obvious:
Leon's guide says a separate SM WP tweak for HDR/DV is unnecessary so I see there are a few varying views on this, which is great. I am just playing around with different configurations to see what works.
- I performed the SDR SM WP calibration at 109% white (255) fine. No problem there. Used the "Cool" temp. My question is specifically with HDR. I decided to use the internal LG pattern generator for that on SM Warm. Ted recommends calibrating the gain using "100% White" for HDR which I am assuming to be the 235 pattern, correct? Or would I use 255 for HDR?
In regards to the iTPG:
Patch scale in LightSpace/ColourSpace when used with the iTPG in the 2019 models must always be 0-255. This is due to where the iTPG is located.
The pack with the guides also contains CSV files that can be loaded to the manual measure tab, and contain all the points you need to measure in HDR/DV and are even named as to which percentage point they refer to.
The absolute 10 bit code values have little relevance when you are following the instructions. If you were adjusting with PQ active, then of course they would as they’d need to be adjusted to the exact absolute value. But PQ conversion is bypassed when using the 2019 iTPG and adjustments are made in gamma space, so everything is measured in a kind of “Relative Mode” for want of a better description. And even if PQ was active, they’d be pretty much useless anyway as undefeatable tone mapping comes into play.
TL/DR....Just follow the instructions, it works.
For those with the PGenerator (or other external generator) and a HD Fury, I would suggest using that if possible over the iTPG anyway.
I think you’ve confused the RGB Triplets the software calls for to be displayed with the absolute digital code value attributed to HDR. It’s a bit of a minefield and can take some time to get your head around. I do it all the time 🤯In HDR all values are absolute, if the metadata says that the max luminance is 1000nits, then the digital value 940.940.940 (8-bit: 235.235.235) is 100% white at 1000 nits.