Originally Posted by RichB
Good dynamic tone-mapping should restore the PQ EOTF, not brighten beyond that.
LG has basically implemented the HDR version of S-Curved gamma.
People may like it, but I think rational heads are prevailing and this is now understood to be inaccurate, and therefore, to be avoided.
LG uses separate tone-curves based on the unreliable static metadata.
For my C7, I use an HDFury Vertex to override the static metadata to get a consistent tone-mapping.
One reason that I bought a C9 over the C8 was to use Calman adjust tone-mapping to track the PQ EOTF to at least 600 nits regardless of the disk authoring.
Two identical scenes should be displayed at different average picture level based on the static metadata. There may be only 1 second of bright content or even no significant APL difference in the source material.
The titles could be simply produced using a higher nit master display.
Dynamic tone-mapping can display more detail in the bright-flashing scenes in Batman V Superman but they loose the visual impact of the flash.
Hopefully, the LG 10 series will include the ability adjust the tone-mapping in the user menu.
I think you're missing the point of LG's approach with DTM.
You can already adjust custom tone mapping curve on 9 series with calibration.
DTM is the fast food out of the box utility which can be very useful (and it does a great job, IMO) for people viewing HDR10 without access to manual/pro calibration.
That being said, it's not one size fits all approach.
For 1,000 nit mastered movies, DTM has little to offer and may even provide a negative result.
For 4,000 nits and 10,000 nits mastered movies and games, picture may look too dim without DTM as a lot of screen will have high nit values which can't be displayed by the OLED, so the TV internally will start mapping down all the picture. DTM then helps stop that process and map tones dynamically to 800 nits (or thereabout) max.
EDIT1: Games are usually mastered in 4,000 nits or 10,000 nits and I don't necessarily need maximum fidelity on games, I always leave DTM on in game mode on my C9. It works so well with PS4 Pro and Xbox one X, they look spectacular. For me, DTM is a lot more useful and important than VRR.
EDIT2: If anything, I wish LG implements the DTM feature so that even if it's turned on:
- For sub-1,000 nits and 1,000 nits HDR10 input = DTM disengages automatically.
- For 4,000 nits and 10,000 nits HDR10 input = DTM kicks in automatically.
If it's off in the menu, it's off all the time.
More of a QOL improvement.