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Discussion Starter #523
I would send them an e-mail with the details of what you are experiencing plus your equipment, settings and a screen shot of the calman scan. If they need anything else, they will tell you. They are pretty responsive and should reply to you in a day.
 
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@WiFi-Spy I send the E-Mail please check it.
 

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@jrref in your scans from the first page I saw that you had the exact same problem with the wide gamut. A friend of mine calibrated his E8 with AutoCal and had also the same issue. These seems to be major problem and should be fixed. Don't know if it's a problem of the TV or CalMAN. Something during the upload doesn't works fine.

John you had a gamut coverage of 107% green and red are not spot on. My friend and I had the exact same.

 

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LG found a bug and will be releasing a firmware update in the next week or so. P.m. me and I can share the firmware with you right now.
I tried the new firmware and DV Autocal worked flawlessly. Except that during EOTF check luminance is somewhat too high. I targeted BT2020 SDR and gamma 2.2 as with HDR10, where luminance tracked well. Any thoughts?
 

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@jrref in your scans from the first page I saw that you had the exact same problem with the wide gamut. A friend of mine calibrated his E8 with AutoCal and had also the same issue. These seems to be major problem and should be fixed. Don't know if it's a problem of the TV or CalMAN. Something during the upload doesn't works fine.

John you had a gamut coverage of 107% green and red are not spot on. My friend and I had the exact same.

Correct, so I spoke to Tyler about this and from what I understand, wide gamut is used to give Autocal more headroom to make adjustments. Although Red and Green are not spot on in your scans, you should really be looking at the CMS sweeps and color checker to see how everything tracks. Even when calibrating manually, it's not always possible to get 100% Red and Green to be spot on and I agree, it would be nice to get a better CMS result from Autocal. Even with this observation, I still feel that the PQ is "better" using Autocal. Also I find autocal can easily fix any crazy problems with the CMS that would take me a lot of time to correct manually.
 

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Another question comes to my mind: what is the exact behaviour of the OLED light setting in SDR, HDR10 and DV mode? I have it at 85% for SDR (yielding my targeted 260nit peak brightness), at 100% for HDR10 (default value) and at 50% in DV mode (default value). After calibration, the max brightness of a 10% box is approx. 733nit for both HDR modes, HDR10 and DV, regardless of the OLED light setting. So what is the exact behaviour of this setting in HDR modes?
 

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Another question comes to my mind: what is the exact behaviour of the OLED light setting in SDR, HDR10 and DV mode? I have it at 85% for SDR (yielding my targeted 260nit peak brightness), at 100% for HDR10 (default value) and at 50% in DV mode (default value). After calibration, the max brightness of a 10% box is approx. 733nit for both HDR modes, HDR10 and DV, regardless of the OLED light setting. So what is the exact behaviour of this setting in HDR modes?


They handle the tone mapping and so they must be at their default values
 

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Correct, so I spoke to Tyler about this and from what I understand, wide gamut is used to give Autocal more headroom to make adjustments. Although Red and Green are not spot on in your scans, you should really be looking at the CMS sweeps and color checker to see how everything tracks. Even when calibrating manually, it's not always possible to get 100% Red and Green to be spot on and I agree, it would be nice to get a better CMS result from Autocal. Even with this observation, I still feel that the PQ is "better" using Autocal. Also I find autocal can easily fix any crazy problems with the CMS that would take me a lot of time to correct manually.


I have discovered a pretty nice method for AutoCal with stunning results. I use optimised OFPS patch sets. I will post some more details later.

I just let you know that this specific patch set has 1157 patches so no need for 3000 points or more.









 
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Correct, so I spoke to Tyler about this and from what I understand, wide gamut is used to give Autocal more headroom to make adjustments. Although Red and Green are not spot on in your scans, you should really be looking at the CMS sweeps and color checker to see how everything tracks. Even when calibrating manually, it's not always possible to get 100% Red and Green to be spot on and I agree, it would be nice to get a better CMS result from Autocal. Even with this observation, I still feel that the PQ is "better" using Autocal. Also I find autocal can easily fix any crazy problems with the CMS that would take me a lot of time to correct manually.
Personally, I'm glad the error is slightly on the "+" side, and not on the "-". I think a "-" error in CMS has a greater potential for artifacts in the picture.:)
 

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They handle the tone mapping and so they must be at their default values
Exactly what I suspected after fiddling around a bit. Will leave them at their default values.
 
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Another question comes to my mind: what is the exact behaviour of the OLED light setting in SDR, HDR10 and DV mode? I have it at 85% for SDR (yielding my targeted 260nit peak brightness), at 100% for HDR10 (default value) and at 50% in DV mode (default value). After calibration, the max brightness of a 10% box is approx. 733nit for both HDR modes, HDR10 and DV, regardless of the OLED light setting. So what is the exact behaviour of this setting in HDR modes?
In HDR10 OLED Light is the same as SDR. But for DV Dolby has repurposed the OLED Light setting to be a mid range luminance adjustment.
 

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In HDR10 OLED Light is the same as SDR. But for DV Dolby has repurposed the OLED Light setting to be a mid range luminance adjustment.
So, can this be used to correct the slightly elevated luminance I discovered after DV calibration or must it be left at 50% under all circumstances?
 

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Can you post what is inside your Dolby Vision configuration file? It is just a text files you can open it with windows notepad.
Sure.

Code:
# Dolby Vision User Display Configuration File
# Generated by 5.9.0.60 on 09.05.2018
# Display: Unspecified
# DM Version: 
PictureMode = 2
Tmax = 733.965438723979
Tmin = 1E-11
Tgamma = 2.2
ColorPrimaries = 0.6754 0.3183 0.2647 0.6714 0.1421 0.0562 0.3127 0.3290
TLMS2RGBmat = 4.23698102594755 -3.37444473986363 0.137463713916084 -0.910261703737672 2.067429282089 -0.157167578351326 0.0399665605325273 -0.119106546787276 1.07913998625475
I understand the meaning of each entry except for the TLMS2RGB matrix.
 

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Sure.



Code:
# Dolby Vision User Display Configuration File

# Generated by 5.9.0.60 on 09.05.2018

# Display: Unspecified

# DM Version: 

PictureMode = 2

Tmax = 733.965438723979

Tmin = 1E-11

Tgamma = 2.2

ColorPrimaries = 0.6754 0.3183 0.2647 0.6714 0.1421 0.0562 0.3127 0.3290

TLMS2RGBmat = 4.23698102594755 -3.37444473986363 0.137463713916084 -0.910261703737672 2.067429282089 -0.157167578351326 0.0399665605325273 -0.119106546787276 1.07913998625475


I understand the meaning of each entry except for the TLMS2RGB matrix.


Everything looks completely normal. I just wanted to make sure that your TMax wasn’t lower that it should be.

Can you post a screenshot of your verification grayscale measurements for Dolby Vision?


Tyler
 

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Everything looks completely normal. I just wanted to make sure that your TMax wasn’t lower that it should be.

Can you post a screenshot of your verification grayscale measurements for Dolby Vision?


Tyler


 

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I calibrated this evening the 65C8 of my good friend with a custom OFPS patch set optimised for rec709 colorspace. I aimed 100 nits so before AutoCal I set OLED light via DDC to 24 which results in ~125 nits. So the peak output drop after AutoCal is about 20% this is important to keep in mind.

After AutoCal I had to touch up some spots here and there manually to flatten things out.

I discovered the exact same problem I had with my C8 at 15 IRE with the little bump. I can't fix this manually because the 42p DDC control let me only adjust 13 and 16 IRE.

I also think that the TV doesn't load the LUT correctly because at 100% saturation the colors are off because of the wide gamut. It doesn't map rec709 it's wider. As you can see on my scans I ended up at 106% gamut coverage.

Another strange thing which I discovered is that CalMAN mapped 4-5 times the points to the 3D LUT during the measurements is that normal?

I attached also the cube after loading the 3D LUT into Lightspace and I discovered that 2 yellow points are way off - same with mine C8 maybe Tyler can say something in addition to that.

I know that pictures from the phone aren't really reliable but they show pretty impressive how good this "small" patch set works instead of 3000 or even more iRP LUTs.

Hope that portrait displays is going to improve the algorithm further.

BJ



















Original



LUT applied with some errors



Uncalibrated



Calibrated

 
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