János Tóth F.

  • @janos-toth-f, thank you!

    Indeed, you have the same kind of difference in luminance between the i1Pro2 and i1 Display Pro as I have. I have asked on avsforum in the OLED LightSpace calibration thread, and the replies were similar, there is always a difference in the luminance measured by the two. I now wonder why people say an i1Display Pro can…

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  • János Tóth F. replied to the topic LG C8 Lut in the forum General Discussion 4 weeks ago

    @janos-toth-f, I have a question not really related to the topic: When you measure the luminance of the OLED panel with the i1D3 (with the generic CMF, not correction applied) and with the i1Pro2, do you get the same luminance? In my case, there’s a difference of about 3-4 nits, and I wonder if that’s usual.

    There is always some difference bet…[Read more]

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

    In case of a 65×4 R,G,B,W ramp test chart both the tone response and the white balance come out pretty bad from a Rec2020 simulation.

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

    [Edit: colprof doesn’t correct anything. This is profiling we’re talking about. collink does the correction. ]

    Oh, yes, collink in that context (although I am not sure if the problem is in the display profile or the link profile).

    I just don’t see why. A profile made from 65 gray patches should paint the tone curve fairly well, at least for the…[Read more]

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

    I guess I do not understand this. When DisplayCAL/ArgyllCMS is driving madTPG, the output levels are completely controlled by the latter.

    The default SDR Contras=85 (/100) and Brightness=50 settings require 16-255 input range, not “standard” 0-255 or 16-235 (Contrast=100 maps the 235 input to internal 1023, Contrast=85 to internal 940 — at least…[Read more]

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

    @janos-toth-f is there a reason this correction profile was created for a “refresh” type display rather than LCD?

     
    Not at all. It was an oversight. I measured a PDP before and forgot to adjust the settings. But I think it’s completely harmless or actually even better. I don’t think the i1Pro2 has a true refresh-sync mode and even then it sho…[Read more]

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

     

    1. In order for any of the calibration and profiling to work properly, there has to be a proper mapping from 0.0-1.0 values being sent by ArgyllCMS and the first and last entries of the LUTs on the TV.  In order to get the proper alignment of values, I found that the following combination of black level, brightness and contrast values give…

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  • 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.

    Could it be the way Alpha7 branded TVs handle the de-saturation of dark colors (the entire luma range is “W boosted”, not just above 100 nit)?

    I played around some more with the C9 (gave the curves+matrix a…[Read more]

  • Ah, then it seems like calibration mode temporarily disables the user menu gamma control even if you don’t upload a 1DLUT (which disables it permanently).

    The bigger problem is that the colors are way off, e.g. green color (produced by the 3 RGB patches).

    So, for the third time: The green patch has high dE because the native gamut doesn’t fully…[Read more]

  • – SDR: Cinema preset (OLED light 33, gamma 2.4, warm2, rest is default / recommended settings)

    From those graphs it looks like gamma was set to 2.2 (and rightly so) not 2.4 as you stated. You should compare the neutral 1DLUT to the factory 1DLUT + 2.2 setting (not 2.4 or anything else).

    is there a factory 3dlut at all?

    If the panel response is a…[Read more]

  • @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]

  • 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…

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  • 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]

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