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2nd June 2020, 16:33 | #59661 | Link | |
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LAV Filters - open source ffmpeg based media splitter and decoders |
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3rd June 2020, 06:23 | #59664 | Link |
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it's in this thread sorry i don't know the page.
https://www.avsforum.com/forum/24-di...projector.html |
3rd June 2020, 11:16 | #59665 | Link | ||
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There was a discussion about this recently in the beta thread started by @Javs, for about from here (and it goes through 10 pages).
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3rd June 2020, 17:27 | #59666 | Link | |
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Currently not, it's a pixel shader with BT.2390 tone mapping (original roll-off), saturation correction and gamut mapping. I'd like to share it at some point but I don't think it's completely finished, it needs some more work and testing, and right now I'm trying to finish another project completely unrelated.
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So in terms of the saturation correction, it would be about finding a middle point, but there is no middle concept, so you have to start from one of the two. Since madhi is not willing to tolerate any hue shift and madVR is completely based on the first concept, I imagine he will try to modify the saturation correction step, and I wish him luck because I consider it extremely complicated. I think that the fact that desaturation is sometimes clearly exaggerated with the second concept, should not make us forget the fact that RGB channels are desaturated in a more natural way in the same tone mapping step, so it's just a matter of avoiding that excess. This can be done even while avoiding any hue shift with some conversions, but honestly, I am used to seeing the fire between yellow and red, also in real life, so maybe the shift is only wrong because we don't know enough about the changes in hue perception related to changes in intensity (see Bezold-Brucke effect), and perhaps the "very bad and un-scientific math" has surprisingly a correct side effect. So of course I understand madhi's point, but instead of adding options to artificially modify it, I think it would be better to allow it naturally up to a limit. But maybe we should ask a firefighter. |
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3rd June 2020, 18:43 | #59667 | Link |
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IMHO that's a display bug/inconsistency. Even if there's no metadata, when receiving UHD the display should switch to BT.2020 colour space as it does with 601/709 when receiving SD/HD. @wasper Are you sure the display colour gamut mode is on 'auto'?
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4th June 2020, 05:48 | #59669 | Link | |
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Headscratch.. why would it do this automatically for 4k. What if someone wants 4K SDR gamut emulation like on PC.
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4th June 2020, 23:16 | #59672 | Link | |
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Hello guys...two questions..
1. If I am using the madvr Tone Mapping, does it mean when doing a 3Dlut with DisplayCal I must select 2.2 Gamma or can I use 2.4? I ask because of a comment I read recently someone saying he was forced to use 2.2 gamma because he uses the tone mapping feature of madvr. 2. Any suggestions on settings when upconverting 1080p blurays to 4K? I am on beta 112. Like maybe this Quote:
Last edited by shaolin95; 4th June 2020 at 23:23. |
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5th June 2020, 00:09 | #59673 | Link |
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Re 3D LUT yes the target has to be 2.2 when using tonemapping. It doesn’t make any difference as PQ is absolute, so it will look the same as if 2.4 was possible. It can be whatever you want for sdr rec-709.
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5th June 2020, 00:38 | #59674 | Link | |
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Ok but since you mentioned SDR, from my understanding, since i have my projector to 2020 and madvr with the 3Dlut on the 2020 slot of the calibration page, then madvr will be taking care of mapping any SDR non 2020 content to 2020 space so I only need that one 3Dlut. Right? Thanks again |
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5th June 2020, 10:39 | #59676 | Link | |
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5th June 2020, 10:48 | #59677 | Link | |
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For the HDR, you create a 2.2 SDR Lut In both cases, you want to use the Native gamut mode of your TV, whichever mode gives you the widest gamut.
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5th June 2020, 13:15 | #59678 | Link |
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HDR Question. Just upgraded to a LG C9 Oled. In madvr under hdr should I just use passthough (with hdr metadata) and have dynamic tone mapping enabled on the tv? Or should I set the target peak nits to 700 in madvr and disable dynamic tone mapping on the tv?
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5th June 2020, 17:55 | #59679 | Link | |
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2.2 is the only possible choice for the target if you want to use the LUT for madVR tonemapping, but you can set the display to whatever you want, as it will be corrected by the LUT. It just makes sense to make the baseline calibration as close to the target as possible if you don't need to use the same calibration fro non-madVR sources.
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5th June 2020, 18:17 | #59680 | Link |
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I use passthrough on my C9 but others prefer madVR's tone mapping.
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madVR options explained |
Tags |
direct compute, dithering, error diffusion, madvr, ngu, nnedi3, quality, renderer, scaling, uhd upscaling, upsampling |
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