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11th February 2019, 20:36 | #54661 | Link |
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No doubt, but what concerns me is if we/they mess to what they think it should look like, then are they actually seeing what it was meant to be. I am sure like me people read UHD reviews on Bluray.com and the amount that say the colours are this, or uptick in detail here, but how many people actually care what there TV is doing. We are actually buying Blurays or UHDs from reviews when its just a normal TV with no fancy third party application making it perfect ? if there is such a thing and looking at that forum, it is going round in circles with every new clever iteration.
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11th February 2019, 20:37 | #54662 | Link | |
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11th February 2019, 21:07 | #54663 | Link | |
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11th February 2019, 21:46 | #54664 | Link | |
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Of course anybody is free to ignore that and just use passthrough especially if you have a good HDR display, but if you only own an SDR display that can output high brightness or an HDR display with bad tonemapping, and you want the best picture possible then it's an interesting development and I don't think it's a case of excessive tweaking.
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12th February 2019, 00:07 | #54665 | Link |
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I would think you Photoshopped that. If not, it just looks ridiculous, to me.
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12th February 2019, 00:38 | #54667 | Link | ||
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It starts when I enable HDR in the CP, and the metadata remains the same when the game is launched and plays. Of course I've enabled HDR in the game as well, as it was disabled by default. I couldn't find the demo of RE2 on Steam, but I did find the demo of SOTTB, so that's what I used for testing. Game isn't a priority so please don't ask for more tests, I'm busy enough with the HDR tonemapping
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12th February 2019, 09:05 | #54669 | Link |
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I've just got my PC hooked up with my TV and enjoying using MadVR especially on the JVC RS49.
I'd like to use MadVR's tone mapping with my LG C6. I use pixel shaders and pass the image through as HDR to benefit from the higher peak brightness of my TV in HDR. My question is: Due to the Nvidia/Windows bugs where bogus meta data of 1000/20 is sent; will the internal tone mapper LG has throw off the results of MadVR? If I set the peak nits of my display to 600, LG's tone mapper should be bypassed as MadVR will report all content as 600 nits or below. But if the OS is saying it's 1000 nits - it'll be applying its own curve? |
12th February 2019, 09:44 | #54670 | Link | |
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But for some reason in all the guides in using madVR and the likes, there is no mention of use this or this driver for HDR (due to metadata) so it seems like its a well known problem (or is it) thats just getting talked about again ? https://forums.geforce.com/default/t...data/?offset=2 Last edited by madjock; 12th February 2019 at 09:51. |
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12th February 2019, 09:58 | #54671 | Link |
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Nvidia bug affect both madVR passthrough and Pixel Shader with HDR output enabled, Do some comparaison by playing your HDR content using TV internal media player and you will see what i'm talking about.
But if you ask me, Pixel Shader with HDR output enabled is the best of the worst. I was digging arround nvidia forums and i couldn't find a single topic about this bug, so time they hear our voice. and maybe madshi could help us by using his NV contact. https://forums.geforce.com/default/t...-hdr-metadata/ Edit: haha madjock was faster quoting my own post
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12th February 2019, 11:09 | #54673 | Link |
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Yes, 385.28 work properly with either passthrough or HDR pixel shader.
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12th February 2019, 11:59 | #54675 | Link |
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The bad news, is nvidia's hdr api is deprecated and pending removal.
As nevcairiel said, maybe madshi should consider OS HDR API instead of NV.
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12th February 2019, 13:07 | #54676 | Link |
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So, because of all this bogus metadata talk I compared nvidia drivers 385.28 (red) and 418.81 (yellow) simply by running a 4000 nits metadata grayscale sweep in HCFR.
TV is a LG C8. As can be seen in the attached picture, below 450 nits there is no difference but above that the roll-off is much smoother with the correct metadata (385.28). Using windows HDR produces the same bogus metadata result as 418.81. I really hope this will get fixed soon. |
12th February 2019, 13:16 | #54677 | Link |
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Hi j82k, thanks for this - I know you're likely to be busy but any way you could test a couple other driver versions? (I loaned my meter to someone). Specifically 398.11, which is apparently the last driver that is working fine for HDR passthrough (and conveniently the driver that brought improved 23p playback...I never could get any good timings with 385.28)
Last edited by iSeries; 12th February 2019 at 13:45. Reason: Added thanks |
12th February 2019, 13:23 | #54678 | Link |
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@j82k
Thanks, that very helpfull, would you please install the latest test build along with nvidia 418.81 drivers and take measurements with those settings: tone map HDR using pixel shaders output video in HDR format = enabled target / real display peak nits = 800 apply dynamic clipping = enabled apply target nits selection = disabled LG dynamic tone mapping = off Because it seems ok for me and almost matchs correct playback using my tv embedded media player. Btw, did you take the previous measurements with your tv's dynamic tone mapping on or off?
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12th February 2019, 14:06 | #54680 | Link | ||
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But it's easy to test even without a meter. I explained this before, don't know if you missed it. On the LG C8 the 20-point white balance adjustment points are different when the TV receives 1000 or 4000 nits metadata. Just open madTPG and enable HDR. Go into your TVs 20 point white-balance settings and check the second last adjustment point. With 4000 nits metadata it should be 713. The number will change in real time when you switch between 1000 and 4000 nits in madTPG. If it doesn't show 713 when madTPG is set to 4000 it means the TV is getting the bogus metadata. As for timings for 23p. On my 1050ti all I have to do in madVRs custom modes tool is pick EDID/CTA and change the pixel clock from 296.70 to 296.69 which gives me almost perfect 23.976 Hz. But of course that could be different on other GPUs. Quote:
But I think displaying single colored squares isn't really a good way to test dynamic tone mapping. |
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direct compute, dithering, error diffusion, madvr, ngu, nnedi3, quality, renderer, scaling, uhd upscaling, upsampling |
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