LG Display (TV/Projector) Owner Thread

[sammy]

@Ronildoq

I have a different view from Sammy. Somehow our understanding differs. In my case, i turn on DTM on the LG. It is a “MUST”. Let me explain why

1. We need to remember, the Projectors are not really capable of DV. What Sammy is merely doing, is to match the Dolby Block in the HD fury to what “he thinks” is the HDR10 processing capabilities of the display (in the above case 100nits), rather than the actual display characteristics of the screen, because what is done here, is HDR10 processing of the LG Projector.

2. While the LLDV generation process does take into account per scene metadata and renders it to the best of it’s abilities, it’s not quite full dynamic tone mapping. We are still reliant on the capabilities of the Display. The source player do not know this. the users input this in the DV block

3. What follows when DTM is off, is that Static Tone mapping is applied. LG’s default Static tone mapping curve is applied.

This is why a lot of the highlights are blown as you can see from his images above. Because he is using the default static tone mapping curve on the LG when he turned off the DTM

1. You are right that I’m trying to tell the LLDV processor the capability of the display. I’m actually at a calibrated 70 nits in Game mode, measured in Calman, but HD Fury/LLDV has a minimum of 100 nits. So I can’t match it exactly.
2. No doubt display led DV is better than player led DV, but player led is quite good IMHO. The DV DATABLOCK is part of display EDID that source will read to know a few things about the display capabilities and how it should send DV stream out, such as primaries, min/max lum, etc. So if you know your display capabilities, you can program them into the DV data block. However, there are more parameters that only display led DV can fine tune. I wouldn’t be using LLDV if LG DTM didn’t crush blacks (on my projector).
3. I’m not sure on the LG PJ if any static tone mapping is applied at all because when DTM is off, anything over about 200 nits is completely blown. One would think that even a static curve would handle stuff over 200 nits in HDR. Having no tone mapping is actually an advantage because double tone mapping can lead to problems.

[desray]

What scene is this? Which movie and time stamp for me to check it out on my Lumagen.

[desray]

@sammy

I’m not sure on the LG PJ if any static tone mapping is applied at all because when DTM is off, anything over about 200 nits is completely blown. One would think that even a static curve would handle stuff over 200 nits in HDR. Having no tone mapping is actually an advantage because double tone mapping can lead to problems.

Is there even any metadata to begin with? MaxCLL and MaxFALL for static DTM to work in that scene.

[sammy]

It’s on the Spears & Munsil disc. Just start the demo scenes and hit >| three times

[desray]

Thanks…l don’t have the physical disc but I think I have the ISO.

[desray]

@Ronildoq

as observe below, this is the type of HDR like image we crave for, at least for me and many others

The image is darker, as confirmed by sammy, i totally agree. But see how it brings out the Highlights ? Isnt that what we are striving for with HDR and LLDV ? Only the sunlight in between that dark scene lights up. High Dynamic Range is like that. Thats what it means. Not the entire jungle lights up like stadium. That is no different from SDR.

That’s 100% correct when it comes to proper DTM.

[sammy]

@desray

Is there even any metadata to begin with? MaxCLL and MaxFALL for static DTM to work in that scene.

The S&M disc does pass through data that is set. However, most projectors, eg LG, BenQ, Epson, e-shift JVC, simply ignore MaxCLL and MaxFALL. I can even substitute them in HDFury, but nothing changes in the projector. The exceptions are the JVC NX/NZ that use MaxCLL to adjust the HDR curve in Auto mode. Frame adapt mode may not use any metadata if it is analyzing frame by frame

[desray]

@sammy

The S&M disc does pass through data that is set. However, most projectors, eg LG, BenQ, Epson, e-shift JVC, simply ignore MaxCLL and MaxFALL. I can even substitute them in HDFury, but nothing changes in the projector. The exceptions are the JVC NX/NZ that use MaxCLL to adjust the HDR curve in Auto mode. Frame adapt mode may not use any metadata if it is analyzing frame by frame

For JVC NZ series, you are right about the JVC FrameAdapt HDR algorithm no needing the metadata at all. But I didn’t know projectors from LG, BenQ and Epson completely ignore the static metadata.

[Wind]

Finally recalibrated my prj. I must say it’s a significant improvement with Vs without the calman aurora engine.

With the aurora engine, image looking even more vibrant.

[Foodie]

+1. it’s definitely a step up after it was incorporated into calman.

I wish they would improve the hdr 3d lut autocal and dv autocal calibration. That’s still something that is quite limited.

[sammy]

Yeah. The Matrix LUT measures only 5 patches so it can’t be that accurate. We PJ users who go SDR2020 can utilize accurate calibrations with external video processors

[Foodie]

I wonder if we use the manual calibration method for hdr, can we perform a more detailed calibration?

[desray]

@Abhuj887, pls post in the marketplace segment of the forum. Thks.

[Abhuj887]

Yes sir