chros

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 weeks, 4 days ago

    I’m afraid no one came up with a valid solution yet. But you can share with us what you’ve tried so far and what its result was.

  • chros replied to the topic LG C8 Lut in the forum General Discussion 1 month, 3 weeks ago

    There are two pieces which are now missing to do things precisely (and these are definitely the reasons for previously observed strange behaviour near white)

    Note, that I observed the same thing when I created sdr 3dlut for madvr (not for the TV).

  • chros replied to the topic LG C8 Lut in the forum General Discussion 1 month, 3 weeks ago

    There are two pieces which are now missing to do things precisely (and these are definitely the reasons for previously observed strange behaviour near white)

    1. Suitable settings of brightness/constrast/black level and pattern generator range to do the calibration
    2. Proper rescaling during the generation of the 3D LUT to account for the fact that…

    [Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 2 months, 2 weeks ago

    My whitepoint isn’t quite perfect

    Yes, it’s too warm.

    contrast 90 looked like a decent value for most people (both here and on avsforum)

    🙂 I have never seen anybody doing like this: either we leave it at default (what ArgylCMS doc suggest) or set it to 100.
    Try out with 85.

    same thing for g2.2

    2.2 gamma is good for day usage, but for e…[Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 2 months, 2 weeks ago

    Yes, screenshots are attached. TV was set on expert2, g2.2, black level low (madvr set to 16-255), backlight at 27 (120cd/m² for me), contrast at 90.

    Couple of thoughts:
    – why did you raise the contrast from default 85? (I don’t think it ‘s a good idea unless you have some big issues with TV/firmware)
    – full field pattern insertion: why didn’t…[Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 2 months, 2 weeks ago

    Happy to report I was able to calibrate my B8 in SDR, my 3DLUT (haven’t touched the 1D) yielded an average ΔE*00 of .23 (max 1.05), report is attached. DisplayCAL seriously puts CalMAN to shame, it’s embarrassing!

    🙂 I’m happy for you, although I haven’t got similar results.

    Would you mind:
    – sharing what settings you used in Displaycal? (pre…[Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 2 months, 4 weeks ago

    I did not follow what you were doing, to know how you got the casts on the white patches.

    Seriously?! 🙂 It’s not that complicated, everything is written on avsforum. I understnd you try to help me, but it’s not helpful if you don’t (want to) know what I’m doing. 🙂

    So 1 more time: I tried to create an SDR 3dlut for madvr (!!!) not for the TV (!)…[Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months ago

    I asked Ted about this, and that’s what he said:<br>
    – on 2018 models, an uploaded 1D LUT, even a unity 1dlut (!) adds extra processing that altering the signal and degrade the picture quality<br>
    – on 2019 models, although the problem is fixed with 1dlut, but it’s still not worth to deal with it due to the WRGB panel

    Here’s more info about t…

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months ago

    Here’s another try with unity1dlut + unity3dlut for madvr SDR. (I uploaded the 2 verification results here as well.)

    And I just realized that the LS guru guys for SDR 3dlut generation leave the factory 1dlut in place (!) and only upload unity 3dlut to the TV, not both.
    I asked Ted about this, and that’s what he said:
    – on 2018 models, an uploaded…[Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months ago

    In the meantime I created (a) SDR 3dlut(s) for madvr (!) after a full dcc reset, but surprisingly I can’t really see difference between the previous 3dlut + factory preset and this one 🙂 (I’ve posted the results there, so I can edit it later.)

    I created another one with the following changes (I haven’t uploaded screens and results either):
    – on Dis…[Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months ago

    Regarding differences between labeling the HDMI input, there certainly are. I encourage you to display the rtings image in an SDR mode while switching the HDMI input mode between PC and BluRay

    Of course you are right, but I meant “between normal labels”: not PC but any other.

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months ago

    • enable calibration; this will disable the HDR EOTF, and instead will make the panel have a 2.2 gamma

    But we saw that is not the case.  (That’s Ted’s post for reference.)

    Regarding the gammut correction (which is what the transform matrix or the 3D LUT does), that’s almost impossible to do, because argyll needs you to display the pr…

    [Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months ago

    In the meantime I created (a) SDR 3dlut(s) for madvr (!) after a full dcc reset, but surprisingly I can’t really see difference between the previous 3dlut + factory preset and this one 🙂 (I’ve posted the results there, so I can edit it later.)

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months, 1 week ago

    I just don’t see why.

    Can it happen that the TV uses a 3dlut in HDR mode in a different way?

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months, 2 weeks ago

    The additional data sent during a DDC Reset for SDR BT709 for a 2019 model are:
    1D_2_2_EN = 0 (unsigned int16)
    1D_0_45_EN = 0 (unsigned int16)
    BT709_3BY3_GAMUT_DATA = [1. 0. 0. 0. 1. 0. 0. 0. 1.] (float), ie a 3×3 identity matrix

    It popped in my mind from these hidden features, whether an endpoint exists for getCalibration: and it…[Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months, 2 weeks ago

    @Josh, first of all, you did an amazing job with the SDR test cases (as well)! Thanks and congrats!
    I have couple of questions.

    2. In order to properly use this with e.g. madTPG, the madTPG output range should be set to 16-255 for SDR

    Where can/do you set it? In madvr itself (under display properties -> custom levels)?

    I needed to hack the code…

    [Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months, 2 weeks ago

    Honestly, I was surprised and happy to see that one of my first attempts with DisplayCAL HDR10 calibration produced sane results at all.

    🙂 Proper test case (screnshots, etc) ? 🙂

    the goal should be getting close enough to CalMAL’s 1DLUT + matrix and nothing more.

    Calibrating the hadrware 1DLUT with DisplayCAL (or applying the calibration t…

    [Read more]

  • chros replied to the topic LG C8 Lut in the forum General Discussion 3 months, 2 weeks ago

    The green patch has high dE because the native gamut doesn’t fully cover DCI-P3.

    🙂 I understand, but something is off with it on my B8.

    It calibrates the tone response and white balance to user defined targets (it recommends Rec1886 for SDR, strictly sets gamma 2.2 for HDR and suggests D66 for both) through the 1DLUT

    Thanks. What White Level (…[Read more]

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