Originally Posted by oledmod
Any reason do use SM WB instead of 2p WB in the normal TV menu for adjustment? Are there any differences?
When you are calibrating HDR10 using the available to normal TV menu RGB balance controls, all these available RGB Balance controls adjustments are taking place in Gamma space.
If the panel peak luminance is higher or lower that the assumed peak luminance of the HDR processing math’s, you may find yourself pushing the grayscale adjustments in odd directions to compensate, resulting in the potential for banding.
When you are using manual cal, its recommended instead of adjusting normal TV menu White Balance settings, to adjust only the White Balance values of color temperature from inside the TV's Service Menu only.
The reason for that is because the normal menu White Balance settings combined with White Balance of Service Menu settings and work as offset from the native panel, and when you have active two controls which are performing the same job, this can make the internal processing algorithm more complex, so its better idea one White Balance menu to be used only to adjust from native panel response and not from both menus (normal TV + service) the same time.
Performing only Service Menu White Balance adjustments it will provide cleaner picture with smoother gradations.
So adjusting SM WB, you change the RGB balance directly from the panel.
As the 20-Point RGB balance controls are gamma based control points, for that reason there no alignment with digital code of patterns.
A lot of people are not using the 20p manual cal of HDR, as it will introduce a lot of problems visually, unless you will spent some very serious amount of time to verify with various content that you will not have any banding during movie playback, so people prefer the 1 or 2 point RGB balance only, or using RGB-Gain from SM WB and then adjust a few points of 20p normal menu RGB balance.
For 2018 LG OLED's, the active tone-mapping, while you perform manual cal, has these factory default values (you can't change):
HDR10 Tone Mapping default 'factory' parameters values
Metadata Point 1:
Roll-Off Point 1:
Metadata Point 2:
Roll-Off Point 2:
Metadata Point 3:
Roll-Off Point 3:
Explanation of how tone mapping works is available here