János Tóth F.

  • @chros Just plot my .ti3 file (captured after full DDC reset) in excel and realize that even though there could be a conspiracy, it’s not the alienz (this time).

  • @josh-2 I think this depends on many things, starting with the question if you want to get it done as quickly as possible through the least amount of steps and complexity involved or you are after the best possible validation reports (which doesn’t always necessarily mean the best overall picture quality, even if it often does).

    As much I know,…[Read more]

  • János Tóth F. replied to the topic LG C8 Lut in the forum General Discussion 1 day ago

    I should have set dICtCp for the validation report and/or looked at the gamma plot. 🙁

  • @chros – Did you notice the validations were done against DCI-P3 and Rec2020 primaries (respectively in calibration and normal mode). Since the panel’s native gamut doesn’t fully cover P3, let alone Rec2020, those numbers will be be fairly high (huge in case of Rec2020). If you want pretty numbers on the reports, you have to create a synthetic…[Read more]

  • I did a quick test on the C9: set the Cool WP preset to 192-192-192 in EZ-ADJUST, measured the gray ramp with SDR Technicolor set to Cool and Wide, then the same preset after a Full DDC Reset. The colverify tool prints very high dE numbers. I am not sure I am using it correctly, so I made a semi-log chart in excel instead. This confirms my…[Read more]

  • @chros – Yes, the profiled HDR10 Technicolor mode is significantly darker than the factory Cinema mode. But dark grays look subjectively way too bright on this C9 in all factory modes, SDR included. The tone response difference wasn’t nearly this prominent when I used this workflow (or CalMAN) on the C8. So, that doesn’t really mean…[Read more]

  • @chros – You can find everything here (onedrive folder). But before somebody shrieks at the sight of the dE values of R,G,B primaries, do note that these validations were done against the DCI-P3 and Rec2020 R,G,B primaries, NOT against the measured native gamut coverage (read the file names).

  • He didn’t even talk to you, have you read the link I posted? 🙂

    Haha. My bad. I though you referred to these posts: ConnecTEDDD and my response where he explains what I already knew: math based HDR10 tone mapping can’t be disabled for normal mode but calibration mode only, thus HDR10 calibration has to target gamma 2.2. Or you have to use an SDR m…[Read more]

  • First:
    – you said: “It would make sense if accurate factory modes normally used a neutral 1DLUT and it was only used to manipulate fancy picture modes”
    – I replied: “But that’s definitely not the case: Cinema Home and Technicolor (factory 1dlut + unity 3dlut)  presets look the same.”
    – I mentioned Cinema Home in the sense of “accurate factor…

    [Read more]

  • That’s also interesting, I haven’t thought of that before: why would the (global!) EZ-ADJUST menu become inactive if we only (!) modify a single (!) preset? 🙂

    In other worlds, when you touch the 1DLUT of a picture mode, that picture mode effectively switches to an imaginary “Native” EZ-ADJUST white point preset which is the same as if you man…[Read more]

  • 3. What I noticed during experimenting:
    – there’s no factory 3dlut by default?
    — Technicolor preset has factory 1dlut, I uploaded a unity 3dlut to it and it looked the same as Ciname Home preset (that we can’t modify)
    – the unity 1dlut results in different color temperature (even when user 3dlut is present):
    — open up the menu and take a look at t…

    [Read more]

  • >How come the DV would only use bt.709 data? It doesn’t make any sense.

    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 (…[Read more]

  • I forgot to add: it would be nice to implement that matrix calibration method. CalMAN always uploads a 3DLUT (even when it’s done by running the numbers though a matrix to fill the cube). I am interested to see how a 1DLUT calibration + a real matrix behaves compared to a 1DLUT calibration + a 3DLUT filled from a matrix in HDR10 mode where the…[Read more]

  •  

    On the other hand the amount of near-black flashing wasn’t noticeably higher to me, so maybe the dithering and different subpixel usage are not totally coupled.  I’ll take a closer look at the subpixel usage and take some photos maybe.

    Calman also sets some additional flags if you tell it you have a 2019 model (it doesn’t actually check that t…

    [Read more]

  • János Tóth F. replied to the topic LG C8 Lut in the forum General Discussion 1 week ago

    I think it was said the C9 models came out-of-the box with a firmware that had the new tone map, the one introduced to C8 with 4.10.31, but I think there was no need to increase Brightness above 50 to raise out of black like it happened to many on the C8.

    I read some speculation that 240Hz (120+120 flicker) BFI was pulled from the 2019 firmware…[Read more]

  • János Tóth F. replied to the topic LG C8 Lut in the forum General Discussion 1 week ago

    @stoma

    Yes, it’s possible the dithering became more visible on that certain shade of color as the tone response drifted with different LUTs (new factory or fresh custom).

    I think this line is meant to be visible and it’s at least 2 pixels tall (exactly 2 lines on my current 1080p display, could be 4 in 2160p). It’s informative, you can sill see…[Read more]

  • János Tóth F. replied to the topic LG C8 Lut in the forum General Discussion 1 week ago

    If someone has a 2019 set it would be interesting to check if they behave the same way.

    I played around a bit with the parameters passed to the start calibration command, but they don’t seem to make any difference either way.  Further ideas on that front are welcome (I was actually hoping that they control the near black dithering behaviour, bu…

    [Read more]

  • @janos-toth-f,  Only writing the 1D LUT is supposed to disable the new dithering algorithm.

    The blocking flag should flip during the firmware update if you altered the 1DLUT before you updated the firmware (to a version with the new dithering from a version with old dithering) and it should be cleared if you re-calibrate with the new firmware.…[Read more]

  • @josh-2, Ted recommend to do the measurements while the TV calibration is disabled. This means: enable calibration -> reset the LUT you will upload later -> disable calibration -> take measurements & create LUT -> enable calibration -> upload LUT -> disable calibration -> take measurements for  verification.

    You can’t do this in HDR10 though (and…[Read more]

  • I hope this helps:

    0: Set your PC to Full Range RGB output. Set the TV to HDMI Black Level: High. Set the Contrast to 100 (yes, 100 for SDR as well). (Optionally use YCC and Low if you want to try correcting any internal processing errors with the LUTs).

    0/b: Figure out the OLED Light values you want after calibration by measuring 100% white in…[Read more]

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