Originally Posted by clifak
Thanks for posting your results
Also, can you explain why you used Contrast 100? I'm getting mixed info on whether I should use 85 or 100 when using the LS workflow.
Originally Posted by BlackJoker
I used contrast 100 to have more headroom for the LUT.
When you use CalMAN for example you can not use contrast 100 because every time when you hit AutoCal it will set contrast back to 85 it's hard coded because the internal LUT needs 85 to bypass.
With LS you don't have this limitation.
About the question of the Contrast setting of 100 Fabio used, which look like an unusual setting for CalMAN users, as CalMAN recommendation were saying the Contrast should be set to 85 and brightness to 50 for LUT’s to work as designed. (bypass settings)
We found (with help of Maciej Koper from HDTVPolska.com also) that the bypass setting of Contrast 85 works when you are using 16-255 patch generation.
When you are using 16-235 patches, you have to set contrast to 100 when you will measure, and after the LUT generation and everything loaded internally to the TV, then you can restore it back to 85 when you will take post-calibration verification.
But you need to set the OLED Light in a setting where you will have about 20% more nits (for example to 120 nits) then you will have Contrast @ 100, because later when you will reduce Contrast to 85, it will reduce your luminance output also, so you will have 100 nits @ verification.
Measure for post-calibration (with above method), it will provide this slightly better results from keeping Contrast @ 85 when you are using 16-235 patch generation.
As Brightness/Contrast are positioned before 3D/1D LUT's, you don't want any change of these controls to be performed to your input signal while you will taking measurements for LUT's generation.
So for these controls to work as bypass, when you are using 16-255 patches, the Contrast 85 is the bypass while when you will use 16-235 patches the Contrast 100 is the bypass.
Image processing chain seems to be: Input Signal -> Contrast/Brightness -> 3D LUT -> 1D LUT (gamma preset, white balance, CMS) -> OLED Light -> Display's Panel.
With this processing chain, you must set contrast this way to make incoming signal levels match LUT level during profiling.
But after profiling you can change Contrast, it will not mess the LUT calibration because it processes the signal before LUT is applied.
The same procedure has to performed with all displays that have internal LUT full range, its not only for LG.
The general rule is that everything before LUT's (from input signal side) must be bypassed before profiling, and can be adjusted after LUT calibration. Everything placed after LUT can be adjusted before profiling and can’t be changed after calibration. OLED LIGHT can’t be touched after 3D or 1D LUT, and 1D LUT must be done first (if used) with 3D LUT bypassed (UNITY).
The input signal must match the dynamic range of a display to make the LUT align to signal levels correctly.
When profiling with CR:85 / BR:50 the signal must be delivered in 16-255 range.
When profiling with CR:100 / BR:50 the signal must be delivered in 16-235 range.