Originally Posted by zeonstar
I was indeed confusing the two. I actually had no idea until today that the TV does some kind of tone mapping regardless of Dynamic Tone Mapping. That sure explains a lot! What is the difference between the TV's tone mapping and its Dynamic tone mapping?
TVs that display HDR have to perform tone-mapping, both for luminances which they can't display, and the wider colours of rec.2020 which they can't display. Since day one. Otherwise if you watched a 4,000 nit movie on a 500 nit display everything above 500 nits would be clipped. For HDR10, there's no standard which dictates how a manufacturer should implement tone mapping. It's the "wild west". Everyone does it differently. For Dolby Vision, there is a standard (Dolby Vision) and this gives content creators confidence on how their work will look.
When doing static tonemapping (in fact all forms of tonemapping), you can EITHER keep the highlight detail, OR the overall brightness. You have to pick ONE because the TV physically cannot display both!
Here's a very good comparison of the different approaches. You will learn a lot from this very entertaining video:
One criticism in the past particularly on low-nit displays is that if there is a single very bright scene in a movie, the rest of the movie can look very dark because the TV tone-maps everything down to make "headroom" for that bright bit.
Dynamic tone mapping, an enhancement built into HDR10+ and Dolby Vision both provide specific data for each scene, instead of a single set of values, so that the TV's tone-mapping algorithm can make better decisions, and doesn't have a whole dark load of stuff just because of one bright scene.
LG's Dynamic tone mapping for HDR10 is a poor man's version of that. It's the TV's guesswork. It analyses the incoming signal "on the fly", without the benefit of knowing what is coming in 1 second or 1 minute's time
, and tries to "react" to the signal that is coming in. If it gets it wrong it can make things suddenly bright or dark because it's constantly having to react.
The "HDR Optimiser" function in the Panasonic players is more than just "Dynamic tone mapping". And it does a far better job. Please watch Vincent's video: