Josh Bendavid

  • Ok, at least one mistake I was making with Profile Only was to use Absolute colorimetric rendering intent.  Using Absolute Colorimetric with white point scaling seems to do something much more sensible when the white point is not pre-calibrated.

  • One thing to be aware of.  One shoudl NOT run “profile only” unless the white point is correctly calibrated to start with.

    Ie, even if one wants to use only the 3d lut for the TV, then one should still run the calibration step in DisplayCal (but in this case check enable “Apply calibration” in the 3D lut settings.)  Doing things this way with t…[Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 3 days, 1 hour ago

    Are you sure the dithering behaviour is not changing when resetting the 1d LUT ?

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 3 days, 1 hour ago

    The 1D LUT can be created by running the calibration procedure (ie by having Tone Curve set to anything other than “as measured” in the Calibration tab in displaycal).  Then the .cal file created with the profile can be uploaded.  Or was the question something different?

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week ago

    My understanding of the behaviour is that the 3d lut does not affect the tv menu/GUI (and I think also the GUI in smart tv apps)

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week ago

    In DV mode, the DV chip shall be allowed to handle all the 3D color mapping (dynamic metadata based tone mapping and color space conversion), so any such processing should be bypassed in the TV’s processor. It looks like it was more convenient for LG to leave these steps (like the 3DLUT processing) in the chain and use (most probably) neutral f…

    [Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week ago

    I did confirm that the additional matrices are active on the 2018 sets (by swapping the matrix rows and enjoying the messed up colors 🙂

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week ago

    A small update here.  In fact it looks like when starting calibration mode for a picture mode with factory 1D LUT, uploading a 3D LUT will also restore the stronger dithering behaviour.  (Possibly/probably sending any calibration data to the tv aside the 1D LUT will trigger this), so it’s not specifically related to these extra flags at least, w…[Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 1 day ago

    Ok, some additional information, and mostly good news.

    Firstly, on the behaviour of these two mysterious flags 1D_2_2_EN and 1D_0_45_EN

    These both seem to be treated as booleans with default 0 (and in principle should be set to 0 as part of ddc reset).  Despite only being used by calman when addressing 2019 sets, these flags are valid for 2018…[Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 1 day ago

    I have a OLED65C8PLA (EU model) btw.

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 1 day ago

    Hmm. So you see more dither patterns in an accurate factory mode (say, Cinema) than in a CalMAN calibrated mode after your did a “full DDC reset”, finished programming both LUTs and quite from calibration mode? Do you also see more near-black flashing (on that test video with the rectangles on black background) in the calibrated mode? Is it an…

    [Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 2 days ago

    Ok thanks, I’ll test with the latest version of Calman, since I realized I had only been using the penultimate version, and also try a factory reset (since I think I was on 05.10.20 the last time I did that)

    I see the same behaviour using (the latest version of) calman, and also after a factory reset, so I’m not sure why we’re seeing different t…[Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 2 days ago

    Ok thanks, I’ll test with the latest version of Calman, since I realized I had only been using the penultimate version, and also try a factory reset (since I think I was on 05.10.20 the last time I did that)

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 2 days ago

    I’ll post some plots later, but I did also observe some strange behaviour related to what Ted had observed, and which I’m trying to make sense of

    1. Different behaviour in SDR mode with calibration ON vs OFF around 5% grey (ie measuring the same testchart in calibration mode vs not gives slightly different results around 5% gray, even with uni…

    [Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 3 days ago

    I’ll post some plots later, but I did also observe some strange behaviour related to what Ted had observed, and which I’m trying to make sense of

    1. Different behaviour in SDR mode with calibration ON vs OFF around 5% grey (ie measuring the same testchart in calibration mode vs not gives slightly different results around 5% gray, even with unity…

    [Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 3 days ago

    I took this to mean that the diagram refers to the order in which the LUTs are applied in the image processing chain, whereas the text refers to the order in which the profiling steps should be done in Lightspace.

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 3 days ago

    According to the info here: https://displaycalibrations.com/lg_2018_oled_profiling_using_lightspace.html under “LG Video Signal Processing Pipeline Info” the 1D LUT is applied after the 3D LUT.

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 4 days ago

    Ready for broader testing now:

    https://github.com/bendavid/aiopylgtv

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 5 days ago

    Then start with “AutoDesk/Kodak 3DLUT”, later you can add LG’s one. Thanks

    The most convenient format would be Iridas *.cube, not some integer format.

    Ok, what I’ve implemented for the moment is Iridas .cube input for both 1d and 3d LUTs.  (As far as I know DisplayCal/ArgyllCMS can only export this format for 3d luts though.)

    For 1d LUTS I’ve a…[Read more]

  • Josh Bendavid replied to the topic LG C8 Lut in the forum General Discussion 1 week, 5 days ago

    I should warn you that I managed to brick my TV by uploading an invalid DV config file.  There’s some discussion here but the consensus was that this was likely caused by the unreasonably low value of Tmax in the config I uploaded.

    I ended up needing to replace the main board to get the TV working again.  (Probably initialization failure of the d…[Read more]

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