As an example of the extremely limited HDR calibration offered by TV manufacturers for UHD/HDR/WCG, here is LG's documentation for UHD Alliance 'Greyscale Tracking'.
As can be seen this guide has no 'colour' calibration component at all - it is just setting the greyscale (as the document title states), and setting the white point to D65.
The TV makes the assumption that all UHD material is graded to P3 primaries (which is presently true, although there is no guarantee to that fact, and in reality is an incorrect step, as all UHD consumer sources have the material mapped into Rec2020 gamut as the delivery container!), and then assumes that the internal colour management of the TV is good enough to correctly map all volumetric colour space accurately.
And as all Home Cinema enthusiasts know, no TV manufacturers ever gets that right with SDR TVs. So why should UHD/HDR/WCG be any different?
Another example of the extremely limited HDR calibration offered by TV manufacturers can be seen here with Vizio's Dolby Vision Calibration (setup!) Guide.
Click the image to the right to download the PDF guide.
The guide describes the use of Calman to again perform nothing more that a 'setup' of the display through greyscale measurements, and a validation that the display's peak colour values matched against the 'Golden Reference' file for the Vizio display.
The 'Golden Reference' file simply contains the expected maximum primary and secondary colour gamut plots, and the 'calibration' process is simply to match the displays (if possible) to these targets, and then assumes that the internal colour management of the TV is good enough to correctly map all volumetric colour space accurately.
Again, as all Home Cinema enthusiasts know, no TV manufacturers ever gets that right with SDR TVs. So why should UHD/HDR/WCG be any different?
This is why this sub-section is called HDR & Dolby Vision 'Setup', as it really can't be called 'Calibration'...
An alternative HDR metadata insertion is the HDfury Integral4K60, which can be used within the HDMI signal path from the LightSpace CMS laptop to the HDR UHDTV, injecting the required meta-data into the signal path.
Using the HDfury Integral4K60 makes use of the free, in-built Light Space CMS Patch Generator for direct display profiling, using the HDfury's own control program to pre-set the required HDR settings.
With this configuration any HDR-10 display can be profiled with LightSpace CMS.
Note: When doing manual HDR measurements do not leave any patch static of the display for any extended period of time, as most HDR TVs have aggressive ABL (Auto Brightness Limiting, or Average Brightness Limiting, depending on who you talk to) and ASBL (Auto Static Brightness Limiting, or Average Static Brightness Limiting).
ABL will immediately reduce the display's peak luminance output when the average brightness of the displayed image is high, which is why small (10% by area) patches are used for profiling.
ASBL reduces the displays luminance output when a static image is seen for more than a few seconds.
Both these effects are required for HDR displays to reduce power consumption (to required legal levels in many countries), and to protect the display from overheating, as well as screen burn-out.
Soft Roll Off is a good example of the potential issues with HDR, as there is no specification for the roll-off value. It is down to each TV manufacturer to define their own 'preferred' value. Within LightSpace CMS we have defined the best value based on our own assessment of an ideal roll-off, and provide controls for the start and end values to enable direct user adjustment.
The end value should be set to the max nits value of the mastering display used to grade the expected source material, while the start value is defined as a percentage before the max nits clip point of the TV being calibrated.
Obviously, for aesthetic viewing any desired values can be used, and again show the issue with the HDR concept, as often what are really 'inaccurate' values generate more pleasing results - assuming the EOTF can be user varied!
Note: The configuration of 'Soft Roll Off' is something that can drastically alter the perception of any HDR display, as different roll off values are required for the different peak luma values used when grading source material. One size will not fit all, due to the issues outlined above. This is one of the problems with HDR TVs without the ability to alter the EOTF - they are attempting to use one Roll Off setting for all source material.
Dolby Vision TVs uses Dolby's own image processing chips, and have a fixed Soft Roll Off, as well as fixed calibration, so there should be little variation between manufacturers, if (and it is a big IF) the manufacturers have accurate inbuilt display calibration - and as stated previously few TV manufacturers actually provide high-quality internal calibration...
And there is still the issue of using one fixed roll setting off for all source material...