Originally Posted by Travis Sturdivant
Can anyone put these questions to bed....
LED Clear Motion clearly makes the screen dimmer. For HDR, it seems to basically set it back to SDR blackness, with a lot of detail being hidden back into the blacks. And there is no way to increase the brightness to what it looks like without LEDCM on. So....
I can't put anything to bed, but I can give my own opinion FWIW.
I haven't looked properly at black crushing issues with it either on or off to be honest.
1) Does LED CLear Motion decrease HDR max and overall normal brightness in a way that harms the overall PQ of the HDR image? Or is the brightness still able to reach the recommended nits for HDR?
The screen is black for part of the time that it wouldn't otherwise be, so the total "output of light per second" if you like, will be lower. How much, who knows. in SDR, I think it's about "3 backlight clicks" worth of brightness difference. I shall have to measure properly with my meter as well when I'm measuring the new firmware's effects.
But the TV's tone-mapping could/should take this into account.
Remember, the vast vast majority of content is still going to be 100 nits or below. when you say "recommended nits for HDR", Every panel has its own peak brightness level, and tone-mapping is used by the TV if it can't get to that level.
Most HDR content is below 100 nits, and this is correct:
Comparison of different tone-mapping pros and cons:
2) If it isn't harming the brightness, is the level of dimming still crushing blacks that normally wouldn't be crushed if you didn't enable LED Clear Motion?
Because I have these questions, I'm hesitant to use LEDCM. From eye test only, when I've looked at what it does, it definitely hides detail I was able to see with it off... but then I'm not sure if that is something that is correct or if the regular HDR picture was just too bright for the content to begin with and what I was seeing should have been darker in the 1st place.
Basically, I have a lot of second guesses and insecurities with using LEDCM and not knowing what the "original image" should even really look like in the 1st place to be able to help me decide which image I should obtain. I like the brighter image, but I also like how LEDCM can help with a lot of motion issues on certain movies that show the flaws of this set.
Pass. I don't really like the flicker very much so don't use LED Clear Motion often, but I have recently tried to train myself to tolerate it.
However, for movies at 24Hz, motion issues are not a problem anyway! You do not need any kind of motion compensation algorithm for 24Hz content on this TV. That content it is designed to have the filmic 24Hz "judder" and the camera's shutter speed and exposure is tuned with this in mind. Sometimes they add blurring to the frames of the movie too. It's intended to be watched at 24Hz (although in the cinema it's projected at multiples of 24Hz with frames flashed more than once!). So, turn Auto Motion Plus to "off" and it will be correct. (that's Vincent's recommendation too
Anyway that's just what I think. Would really like to hear other people's comments!
Originally Posted by Chuck Ebby
Are you seeing this on any specific app or just across the board?
I re-watched the start of "The Man in the High Castle" on Amazon Prime Video. Lots of lovely bright lights. Including some welding in a factory near the start (timestamp 3:50). It really does seem brighter than I remember it!