Panasonic UB820/UB9000 4K UHD Blu-ray player

[gnicks]

Originally Posted by nachoju95

I also have a B7, I never tried having HDR Optimizer On and HDR Active Off. Which movies did you try? Or in which did you notice the difference?

Here are a few examples that spring to mind.

In Close Encounters, which has some bright highlights, when Richard Dreyfuss is in his truck at the train tracks, there are some shots with large shafts of light. Turning off Active HDR here revealed additional definition to the brightest parts of the image.

In Spider-Man 2, when Peter visits Doctor Octavius for the first time, there are people working on his machine and a bright light behind it. You will see the full flare of that light with active HDR off.

Now, those are both high nit Sony titles, but I also noticed it in Avengers, which is mastered at 1,000. When Iron Man is introduced underwater, his hand laser is slightly blown out with Active HDR on. The same thing can be seen in the following sequence at Stark Tower when Tony picks up a hologram of the tesseract. The center of the cube has a bright, swirly light that is almost completely lost with Active HDR on.

These were just random things I remember finding. My guess is that you could find many more if you were looking for them. So while the image isn't being completely destroyed, I do feel like that additional brightness comes at a cost when using Active HDR.

I would be interested to know if others have found the same thing.

[Geoff D]

Originally Posted by gnicks

Here are a few examples that spring to mind.

In Close Encounters, which has some bright highlights, when Richard Dreyfuss is in his truck at the train tracks, there are some shots with large shafts of light. Turning off Active HDR here revealed additional definition to the brightest parts of the image.

In Spider-Man 2, when Peter visits Doctor Octavius for the first time, there are people working on his machine and a bright light behind it. You will see the full flare of that light with active HDR off.

Now, those are both high nit Sony titles, but I also noticed it in Avengers, which is mastered at 1,000. When Iron Man is introduced underwater, his hand laser is slightly blown out with Active HDR on. The same thing can be seen in the following sequence at Stark Tower when Tony picks up a hologram of the tesseract. The center of the cube has a bright, swirly light that is almost completely lost with Active HDR on.

These were just random things I remember finding. My guess is that you could find many more if you were looking for them. So while the image isn't being completely destroyed, I do feel like that additional brightness comes at a cost when using Active HDR.

I would be interested to know if others have found the same thing.

IIRC the active HDR in the 2017 implementation wasn't the best. But the problem with getting that missing detail from 1000-nit mastered titles is that the Optimiser won't do a thing if you set it to OLED.

[Fred Bang]

Originally Posted by gnicks

Here are a few examples that spring to mind.

In Close Encounters, which has some bright highlights, when Richard Dreyfuss is in his truck at the train tracks, there are some shots with large shafts of light. Turning off Active HDR here revealed additional definition to the brightest parts of the image.

In Spider-Man 2, when Peter visits Doctor Octavius for the first time, there are people working on his machine and a bright light behind it. You will see the full flare of that light with active HDR off.

Now, those are both high nit Sony titles, but I also noticed it in Avengers, which is mastered at 1,000. When Iron Man is introduced underwater, his hand laser is slightly blown out with Active HDR on. The same thing can be seen in the following sequence at Stark Tower when Tony picks up a hologram of the tesseract. The center of the cube has a bright, swirly light that is almost completely lost with Active HDR on.

These were just random things I remember finding. My guess is that you could find many more if you were looking for them. So while the image isn't being completely destroyed, I do feel like that additional brightness comes at a cost when using Active HDR.

I would be interested to know if others have found the same thing.

Yes indeed. In close Encounters when he's in his truck, with the optimizer on, I see way more texture on his seat instead of a white wash blur. it does remove a bit of the highlights, but not enough to justify sacrificing the details.

[gnicks]

Originally Posted by Geoff D

IIRC the active HDR in the 2017 implementation wasn't the best. But the problem with getting that missing detail from 1000-nit mastered titles is that the Optimiser won't do a thing if you set it to OLED.

I think I understand what you are saying. However, even in the case of The Avengers, I was losing that highlight detail with active HDR on.

So HDR optimizer on and active HDR off brought back detail even in a 1000-nit title.

If the optimizer does nothing with 1000-nit content (And I believe you that it does not), then I would guess the active HDR is introducing this loss of highlight detail all on its own.

I will experiment further.

[pbz06]

Originally Posted by gnicks

I think I understand what you are saying. However, even in the case of The Avengers, I was losing that highlight detail with active HDR on.

So HDR optimizer on and active HDR off brought back detail even in a 1000-nit title.

If the optimizer does nothing with 1000-nit content (And I believe you that it does not), then I would guess the active HDR is introducing this loss of highlight detail all on its own.

I will experiment further.

That's correct. The active HDR is likely trying to brighten up the picture due to its internal math from assessing the picture, to make it 'pop'...but likely it's just pushing it past its capabilities of resolving high nit content, so while it makes everything brighter (or raising the floor) it's likely also missing a little bit.

Back in 2017 my guess is that dynamic stuff wasn't all too accurate and probably more similar to "dynamic contrast" features as opposed to very accurate and well implemented dynamic tone mapping.

Keep experimenting and tell us what you find. I plan on messing around with it this weekend too.

[Fred Bang]

Could you guys share which firmware version your player is currently at?

[tama]

Originally Posted by pbz06

That's correct. The active HDR is likely trying to brighten up the picture due to its internal math from assessing the picture, to make it 'pop'...but likely it's just pushing it past its capabilities of resolving high nit content, so while it makes everything brighter (or raising the floor) it's likely also missing a little bit.

Back in 2017 my guess is that dynamic stuff wasn't all too accurate and probably more similar to "dynamic contrast" features as opposed to very accurate and well implemented dynamic tone mapping.

Keep experimenting and tell us what you find. I plan on messing around with it this weekend too.

I'm wondering this as well. The 2018 models introduced their own DTM function in the menu section. However on the 2017 models it was recommended to set dynamic contrast to LOW to engage Active HDR. Unless I missed it somewhere LG never referred to it as DTM. I could be wrong and missed it.

[Geoff D]

Originally Posted by gnicks

I think I understand what you are saying. However, even in the case of The Avengers, I was losing that highlight detail with active HDR on.

So HDR optimizer on and active HDR off brought back detail even in a 1000-nit title.

If the optimizer does nothing with 1000-nit content (And I believe you that it does not), then I would guess the active HDR is introducing this loss of highlight detail all on its own.

I will experiment further.

As I said, the 2017 implementation of active HDR wasn't the best. As you say, it wasn't even referred to as such, it was buried in the dynamic contrast setting so in that respect it was probably tying in this early DTM with whatever special-sauce contrast enhancement was also going on, hence this less than accurate representation of some content.

And as for the Optimiser, I dare say that if you turn off the dynamic contrast in the TV then you'll see the same highlight detail in Avengers with the Optimiser off or on. The TV is still doing its own static tone mapping, remember.

[Scorsese]

Originally Posted by tama

I'm wondering this as well. The 2018 models introduced their own DTM function in the menu section. However on the 2017 models it was recommended to set dynamic contrast to LOW to engage Active HDR. Unless I missed it somewhere LG never referred to it as DTM. I could be wrong and missed it.

Yeah I have a 2017 LG LED (so, not the best with HDR) and setting Active HDR really makes the image brighter but it also dims when I pause it, very strange.

[gnicks]

Originally Posted by Geoff D

As I said, the 2017 implementation of active HDR wasn't the best. As you say, it wasn't even referred to as such, it was buried in the dynamic contrast setting so in that respect it was probably tying in this early DTM with whatever special-sauce contrast enhancement was also going on, hence this less than accurate representation of some content.

And as for the Optimiser, I dare say that if you turn off the dynamic contrast in the TV then you'll see the same highlight detail in Avengers with the Optimiser off or on. The TV is still doing its own static tone mapping, remember.

I totally agree with your point on the optimizer. I was only referring to the active HDR messing things up in the highlights that the static tone mapping clearly does not.

[Geoff D]

Originally Posted by Scorsese

Yeah I have a 2017 LG LED (so, not the best with HDR) and setting Active HDR really makes the image brighter but it also dims when I pause it, very strange.

Is that not the ABL or ASBL kicking in?

[Scorsese]

Originally Posted by Geoff D

Is that not the ABL or ASBL kicking in?

Well, I don't know since it doesn't do it on the other picture modes as far as I can see.

[pbz06]

Originally Posted by Scorsese

Well, I don't know since it doesn't do it on the other picture modes as far as I can see.

Still makes sense. ABL can kick in when a static image of a certain brightness is on the screen, so when you pause it, it triggers it. My guess is that during playback it doesn't reach the threshold duration since it's more "dynamic".

Sorry I'm just guessing and speculating a lot

But I think we are on the right track

[Scorsese]

Originally Posted by pbz06

Still makes sense. ABL can kick in when a static image of a certain brightness is on the screen, so when you pause it, it triggers it. My guess is that during playback it doesn't reach the threshold duration since it's more "dynamic".

Sorry I'm just guessing and speculating a lot

But I think we are on the right track

You're probably right

Guess I'll have to upgrade my TV then

[Geoff D]

Sorry Scorsese, I thought you had an OLED, I misread your post. But clearly it's some kind of process unique to the active HDR/dynamic contrast mode anyway, maybe the processing only works on moving content so when you pause it 'stops' it?

[Scorsese]

Originally Posted by Geoff D

Sorry Scorsese, I thought you had an OLED, I misread your post. But clearly it's some kind of process unique to the active HDR/dynamic contrast mode anyway, maybe the processing only works on moving content so when you pause it 'stops' it?

Yes, that's what I'm seeing. Ah well, there's nothing I can do about it right now, will just leave it off for the time being

[Fred Bang]

Question about the Television type setting (High Luminance, Super High Luminance, OLED). This is only affect the optimizer on HRD10, right? It has no effect on Dolby Vision titles?

[pbz06]

Originally Posted by Fred Bang

Question about the Television type setting (High Luminance, Super High Luminance, OLED). This is only affect the optimizer on HRD10, right? It has no effect on Dolby Vision titles?

Yup, correct.

[Yautja_Warrior]

Since I started buying 4k movies a little time ago, and with some brilliant new releases coming soon, I thought I better finally get myself a player, so I've got myself a Panasonic UB820, which is arriving today.

Looking forward to finally watching some 4k movies on disc.

[Fred Bang]

Well I exchanged the player and still got the issue. Although it happened only after 8 hours of mostly continuous play. Maybe it’s relatively «*normal*». I’ll stop pushing it to it’s limit now and use it normally to see if it annoys me or not.