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5th May 2020, 15:24 | #59482 | Link | |
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The reason we get posterization from argyll cms is when its gamut compression engine fails. This failure can be the result of many things in the chain not necessarily always the same. This compression failure is also not simply the result of how big or small the gamut is. I have SDR displays using a p3 and rec2020 lut, It's only 76% dci p3 and yet NO Posterization. Smaster's observation of getting posterization tuning for rec2020 is TRUE for HIS DISPLAY. It is NOT_TRUE for all displays. Again, it's not due to how big the gamut is, it's how closely aligned the primaries are to the source color space, and the various interplays of the display chain. We have multiple devices with multiple maps.
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Ghetto | 2500k 5Ghz Last edited by tp4tissue; 5th May 2020 at 15:27. |
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5th May 2020, 16:49 | #59483 | Link | |
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So if if it was you, how would you calibrate it for 4k movies? |
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5th May 2020, 17:01 | #59484 | Link | |
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Clearly you see denoise in the stats chewing up 17.02ms and pushing me way over the edge. Fwiw, turning off supersampling doesn't improve anything. This is SDR. HDR is even worse. What am I doing wrong? Thanks. https://i.imgur.com/smDH8yK.png https://i.imgur.com/3X9N5BW.png
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5th May 2020, 19:38 | #59486 | Link | |
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So I think there is good chance he runs into a similar issue. Something to look out for at least. Many of us over on AV Science forum JVC calibration thread are noting the posterization with 3DLUT for BT.2020 on all our JVC projectors, but it'd fine when targeting DCI-P3. I have seen it on other displays, but seems particularly bad on JVCs in general. |
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5th May 2020, 20:13 | #59487 | Link | |
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Silly question, when interpreting stats in terms of rendering and max, what is a "safe" number to see there? I am leaving a movie running now to see in 2 hours what kind of drops if any I get. It is showing like 5 hours for repeated frames, so I don't expect any issues but just in case UPDATE: Finished the 2.5 hour movie with one frame repeated. It was showing 5 hours but still repeated 1..guess it not a big deal much better than my starting point of repeating a frame every 30s Last edited by shaolin95; 5th May 2020 at 23:25. |
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5th May 2020, 20:15 | #59488 | Link | |
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6th May 2020, 09:17 | #59490 | Link | ||
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The LUTs are shared here. As I analyzed your data, I found it was not a problem with Argyll that caused artifacts with BT.2020 LUTs, but the problem was with your data. Basically, the measurement data has a lot of weirdness around the display's gamut boundary region. And that is due to gamut processing done by the projector. Your projector is not doing a standard gamut mapping from BT.2020 to the native gamut, instead it is probably doing some extra processing/enhancement along with gamut mapping that is hard to understand just looking at the data. I had to process your data in a certain way to be able to create clean LUTs. Last edited by omarank; 6th May 2020 at 09:24. |
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6th May 2020, 14:52 | #59491 | Link | |
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Thank you! |
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6th May 2020, 18:06 | #59495 | Link | |
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The idea was to ensure that the problematic measurement data corresponding to the display’s gamut boundary region was not used in computing a color transform. No gamut compression was done. The intent was absolute colorimetric (with white point scaled to prevent clipping). The point of sharing the LUTs was to prevent the spread of misinformation, unintentional though, that BT.2020 LUTs cause posterization. |
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7th May 2020, 00:43 | #59496 | Link | |
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I don't use the type that goes in the hdr tab for tone-mapping since I use the dynamic tone-mapping in madVR. I put my 3DLUT in the calibration tab. This 3DLUT cant go there under calibration, madVR says it's the wrong format. Anyways with the tone-mapping 3DLUT the picture had almost no color, (probably because it's for 480 nit and my screen is under 100 nit?). Either way I can't even begin to judge for posterization with the 3DLUT as everything is just super flat and dim. |
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7th May 2020, 00:53 | #59497 | Link |
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Hello
Looking for some kind of suggestion / help Spec PC is the one in my signature TV used for the setting is 4K HDR enabled Sony XF9005 model My question would be, please - what's better - HDR Passthrough & Metadata being sent or the ToneMapping done by MadVR + HDR output (on or off, if it matters) Screenshots attached from madVR with both options Thanks a lot
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7th May 2020, 02:54 | #59498 | Link |
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Upload images somewhere else, they won't be approved here shortly, since you have a 1080Ti madVR would be best if the TV and madVR were configured right.
*looks like approval times have gotten better Last edited by ryrynz; 7th May 2020 at 07:55. |
7th May 2020, 04:54 | #59499 | Link | |
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Not sure what you mean by a different kind of LUT. If you refer to the HDR to SDR LUT, it was only provided as a reference, so as to show that both types of BT.2020 LUTs (SDR and HDRtoSDR) can be posterization free. Your projector has a peak luminance of 81.2 nits (as per the data) and I targeted a brightness ratio of 6:1, so targeted 487.2 nits for tonemapping. The image should be about 6 times dimmer as compared to a flat panel having about 480 nits peak luminance. I can also create an HDR to SDR LUT targeting about 200 nits (or any other level) if needed. You should check the Gamma 2.2 LUT in the Calibration tab anyway and if you see posterization, share the screenshots with LUT On/Off and also with your DCI-P3 LUT activated. Last edited by omarank; 7th May 2020 at 05:27. |
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7th May 2020, 05:46 | #59500 | Link | |
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I completely didn't think about the other LUT the one you named SDR as for some reason I was thinking it was rec709 or something like that. I hope these didn't take too long to make because I don't think I can do a real comparison as the data I posted is quite old and I have changed up how I have my projector set up since then. That profile was created back when I ran my bulb on low and iris wide open and on a different base calibration (JVC autocal, which updates the core calibration tables) Since then I have switched to high bulb, closed my iris to -10 (which is quite far, increasing my contrast) and re-did autocal for a new base calibration. I don't currently use a 3DLUT due to the posterization issue I was getting and also because with autocal and a tiny bit of manual calibration adjustments within the projector (custom gamma curve for 11 point WB and CMS adjustment) I am getting something like 1-2dE at worst for all my measurements (except those colors within P3 that are outside my projector's gamut). I would like to make a fresh BT.2020 3DLUT and see once again if I am getting the posterization and then can send you that profile to take a look at and modify and then can compare that to the stock DisplayCAL one. I am definitely interested in how a modified 3DLUT can compare to the stock one although from the sound of it I wouldn't be able to reproduce the modifications you are doing anyways for future 3DLUT or if I generate some for friends and family/etc. |
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direct compute, dithering, error diffusion, madvr, ngu, nnedi3, quality, renderer, scaling, uhd upscaling, upsampling |
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