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Old 14th May 2022, 04:42   #2301  |  Link
SamuriHL
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I didn't test any other mode. Just the calibrated one. It was blended but raised. I'll try again tomorrow night with the internal player on both the c8 and g2 and see what that looks like. It's possible the shield is doing something screwy.

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Old 14th May 2022, 11:47   #2302  |  Link
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Quote:
Originally Posted by quietvoid View Post
So I just did a manual Dolby Vision calibration using some custom files.
So it doesn't seem to have made a significant difference. I guess there's just no point trying to verify post-cal.
Still wonder if I should leave it at 695 or 675 nits

For most tests I did I can't really tell a difference.
For some reason however, some Spears & Munsil shots look really bad in any other mode than Cinema (for which I uploaded the config).
No idea if it regressed or something? I never use the other modes.
I couldn't upload DoVi config, I tried once via USB but the TV didn't recognised it.
This is the factory results of all the DoVi presets on my B8 (not in calibration mode), after 20 patches (using black frame insertion in every 2nd frame), it's around 730 nits (same as the peak in non-PC mode HDR10 Cinema preset).
And yes, the problem with DoVi is that we don't have any other preset to compare the image to.

Quote:
Originally Posted by SamuriHL View Post
I didn't test any other mode. Just the calibrated one. It was blended but raised.
If you think it's raised with DoVi then try one of these to make it clear (it should result in true black):
- lower brightness from 50/100
- lower contrast from 100
- lower all the RGB values equally of the Low 2pt white balance setting (if it's still available after calibration)
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Old 14th May 2022, 14:20   #2303  |  Link
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Thanks for the test @SamuriHL but I wouldn't use the Nvidia shield to test anything related to DV. Do you have a bluray player or a firestick TV ?
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Old 15th May 2022, 04:34   #2304  |  Link
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I have lots of different devices. Didn't really matter which I used. I interpreted the results wrong. That pattern, chros73, is a bit weird. I understand it now after looking at it more. I totally misread what it was showing last night.

As for device, shield is fine but I used the internal app off a USB stick tonight so no one could complain about my test this time.

Now that I know how to read the stupid thing the g2 is spot on for black in my calibrated dv mode. My c8, however, is severely crushed and nothing I did solved it. We're talking massively crushed where I could not see anything below 72. Increasing the oled didn't solve it. Increasing the brightness only made everything washed out but still couldn't see the flashing bars.

So yeah, awesome on the g2 as it was spot on but wtf with my c8. I may have to get creative with that damn thing. I can't really calibrate dv on that thing so this really sucks. I'm not investing in a dv capable external tpg. There is one possible option but it massively sucks. I may have to play with calman to get the damn thing fixed. The whole point of moving the c8 in the bedroom was for dv streaming so this isn't awesome right now. I realize the test was meant for the g2 but it's shown me just how f***ed my c8 is lol

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Old 15th May 2022, 11:48   #2305  |  Link
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Shiled is only fine with profile 5 DoVi, not with profile 7/8.1 (I replied to the rest on avs).

About the C8: yes, 72 is on our B8/C8 sets as well.
But the biggest issue is not this: but the elevated blacks on it!!! (workaround on avs, that didn't work on queitvoid's C8, but that will crush black more, it's 80 on my B8 with setting them to -1).
And you can't calibrate the black crush out, not even with a 1dlut! I tried, probably that's the fault of DoVi engine. The massive black glowing with 4.x fw could been reduced with 1dlut though, but it's better now with ootb 5.x, so I didn't touch it.

And the other big issue is the HDR10 cyan/magenta bt2020 3dlut processing issue (that you still forget )
Only SDR is fine

What do you think why I want to replace my TV? If only the B8 didn't have these issues, I'd never replace it until it dies
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Old 15th May 2022, 13:21   #2306  |  Link
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Quote:
Originally Posted by SamuriHL View Post
I can't really calibrate dv on that thing so this really sucks. I'm not investing in a dv capable external tpg. There is one possible option but it massively sucks.
What option is that?

I've done it manually and it's pretty straight forward, you just need the files on a USB or network storage (I do DLNA).

Warm up TV, adjust 2 point white balance with greyscale patterns.
Take readings of black, white, RGB primaries (DCI-P3), white again for peak.

I used these patterns: https://mega.nz/file/1BNnhToZ#mI2ri5...1eRJ1b6HKOgkkg
They worked for me in the LG internal player on the C8.
In the 7z there are black/white/red/green/blue DCI-P3 in BT.2020 1000 nits patterns.
And greyscale from 0% to 100%.

Calman lets you hover over the CIE chart points to get xy values, so ColourSpace probably has something similar.
HCFR also shows the values.

Then you can just feed those to aiopylgtv using "create_dolby_vision_config".
I used my own script which gives a similar result: https://github.com/quietvoid/lgtv_dovi_config_gen

Copy config to a file and fix up Tmin/Tmax.

Then you just need a way to upload it to the TV, supposedly USB works but I didn't try.
Not sure if ColourSpace lets you do it manually either.
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Old 15th May 2022, 15:11   #2307  |  Link
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I was talking about calman and my HD fury. That let's you calibrate DV on a c8 but I'm not letting it ddc reset anything. I also have no real interest in reinstalling calman anyway.

You method is interesting, though. Yes I could do that with colourspace easy enough. Fascinating. Might have to play with that. Thanks.

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Old 15th May 2022, 15:19   #2308  |  Link
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I don't use a matrix lut for hdr. White point sm and 2pt grayscale only for me on the c8. 3d lut on these lg's for hdr doesn't work right.

On the g2 I currently have a 1d lut loaded but that's going away once I factory reset after 300 hours which I should hit soon. That'll also be a grayscale adjustment and wp sm adjustment. It tracks so close ootb anyway.

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Old 15th May 2022, 15:32   #2309  |  Link
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It's still unclear to me if the Dolby Vision config primaries should be measured after a DDC reset, so I'll probably be doing a factory reset later today to test it out.
Obviously the Calman AutoCal guide always does a reset, but some others don't.
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Old 15th May 2022, 15:58   #2310  |  Link
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I'm not doing any kind of DDC reset. Period.
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Old 15th May 2022, 21:59   #2311  |  Link
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@@Chros

Quote:
Originally Posted by chros73, post: 61675612, member: 8752466

raised black in DoVi, workaround:

set -1 (or lower values) for all the RGB values at 2 pt White Balance Low

On my C8, workaround #1 doesnt work for me. Only contrast=99 give me pure black in DV (without crushing more details).

SDR/HDR10 is pure black.

I use these 5 min. of pure black test files in SDR/HDR10/HDR10+/DoVi (without flashing bars) here:


Code:
DoVi:

https://drive.google.com/file/d/100euaVEVUZI7rQ2gU7rWXkKBS3hdp4tM/view?usp=sharing

HDR10plus:

https://drive.google.com/file/d/1Fe4n-mKW51_rTj1t6bZ2X3uMtkJSmDyE/view?usp=sharing

SDR:

https://drive.google.com/file/d/1-o5KQAZrGZQ6yzO3LgDR1MXJtSmLd4g5/view?usp=sharing

Last edited by Kuler087; 15th May 2022 at 22:12.
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Old 15th May 2022, 23:36   #2312  |  Link
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I've managed to make the C8 better. Not perfect, and I don't think there's any way to really make it great anyway, but, better. So that's good.
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Old 15th May 2022, 23:54   #2313  |  Link
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Better for what?

I just recalibrated all my modes.
20 pt SDR + 3D LUT, 2 point HDR10 + 3D LUT (with VCGT calibration), 2 point Dolby Vision + config.

Attempted a 2 point only HDR10 calibration but it's not possible to fix my bad EOTF tracking.
So I just reused my old calibrated 3D LUT along with some 2 point fixes.

I also tested Dolby Vision DCI-P3 measurements in the panel native WP (DDC reset), and they're identical. So that's good.
And compared Dolby Vision Cinema vs Home in factory, Home is indeed messed up by default in the internal player.
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Old Yesterday, 00:22   #2314  |  Link
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Black levels, obviously.
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Old Yesterday, 00:23   #2315  |  Link
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And Dolby Home Cinema is not to be used if you care about accuracy. It's not the internal player, it's that mode. It's raised in the mid-tones intentionally above EOTF.
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Old Yesterday, 00:40   #2316  |  Link
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Yea I know, but there's something weird with yellows as well.
For example that famous eagle shot in the Spears & Munsil disc, the beak only looks normal in Cinema, and super dim and greenish in other modes.
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Old Yesterday, 02:10   #2317  |  Link
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Yea I don't use anything but Cinema mode on the C8.
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Old Yesterday, 14:49   #2318  |  Link
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Quote:
Originally Posted by Kuler087 View Post
On my C8, workaround #1 doesnt work for me. Only contrast=99 give me pure black in DV (without crushing more details).
Try lowering the values more -2/-3/-4/etc, chadwick said it worked for him in his C8, quietvoid said it didn't on his, not sure about SamuriHL.
Contrast/brightness adjustment is not recommended.

@quietvoid, thanks for the calibration patches!
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Old Yesterday, 16:06   #2319  |  Link
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I did a manual 20pt calibration (more or less. less than more on this one given that it was TRULY manual as in load a patch in the internal player, measure, etc) and then uploaded a config file so I didn't do anything like that work around for Cinema mode. I did, however, raise the t-min black from 0.0001 in the config to 0.0005 which seemed to help.
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