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Old 13th March 2019, 17:35   #55321  |  Link
tp4tissue
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Originally Posted by Manni View Post
4K60p 4:4:4 can only run in 8bits, so 12bits isn't an option for that.
-SNip snip snip_

Has anyone quality assessed 444 8bit vs 422 10/12bit , which is better visually

Assssuming they got 10/12bit working of course.

Is the extra chroma more worthwhile than the m0ar bits


I understand ideally, we'd have displayport w/ 444-12
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Old 13th March 2019, 17:47   #55322  |  Link
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Frankly the bandwidth is only an issue with 60p content, so as I don't care about Billy Lynn I'd rather have 444 12bits for all my 23p content (99.99% of what I watch).

Unfortunately there is a bug with the JVCs, at 4K RGB 444 12bits the colorspace is forced internally to YCC422, even at 30p and below. This messes levels (when using video levels) as it requires PC levels to work, and possibly some bad things happen to chroma behind madVR's back. That's why I'm using 8bits at the moment (along with issues with calibration in 12bits). Hopefully they will fix this.

Otherwise I'd rather use 444 12bits with all my 23p content and 444 8bits with 60p, given that the driver switches automatically, than limit all content to 422 and hobble madVR's chroma upscaling.

I'm sure others will have other preferences, for good reasons

All this will last until HDMI 2.1, but we'll probably have to wait a couple of years before we can upgrade the whole chain to that.
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Old 13th March 2019, 21:39   #55323  |  Link
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Even when we get the ports, I bet they'll still screw up 10bit and we'll be stuck at 8..

hahahaha

Btw, manni, how are you setting up dispcal 3DLut to work with the Madvr HDR tonemapping mode, Or are you using the SDR lut.
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Old 13th March 2019, 22:36   #55324  |  Link
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Originally Posted by tp4tissue View Post
Btw, manni, how are you setting up dispcal 3DLut to work with the Madvr HDR tonemapping mode, Or are you using the SDR lut.
I tonemap HDR with pixel shaders and use an SDR DCI-P3 baseline in the projector with a 3D LUT for that (P3 gamut, 2.2 power gamma target). Works great.
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Old 13th March 2019, 23:14   #55325  |  Link
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I tonemap HDR with pixel shaders and use an SDR DCI-P3 baseline in the projector with a 3D LUT for that (P3 gamut, 2.2 power gamma target). Works great.
Give me your shader files please.
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Old 14th March 2019, 01:18   #55326  |  Link
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Originally Posted by Manni View Post
I tonemap HDR with pixel shaders and use an SDR DCI-P3 baseline in the projector with a 3D LUT for that (P3 gamut, 2.2 power gamma target). Works great.

is this through hcfr or dispcal
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Old 14th March 2019, 14:14   #55327  |  Link
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Originally Posted by tp4tissue View Post
Does the user snowknight have the vega 56 or 64 ?
I don't know, I couldn't find it.
RX Vega 56.
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Old 14th March 2019, 14:49   #55328  |  Link
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RX Vega 56.
Thx for nfo SnowK .
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Old 14th March 2019, 16:44   #55329  |  Link
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is this through hcfr or dispcal
At the moment it's a lightning LUT (101 points) generated in under 10 minutes by Calman Ultimate, as the projector is very linear and I get near reference results like this. When I need more, I will compare what I get with a larger LUT in Calman and in Lightspace (I own both).

But DisplayCAL should give very good results. In fact it gave me better results than Lightspace using the same profile created with Lightspace when I had issues with my rs500.

If DisplayCAL (well, Argyll) was able to support my BasiCColor Discus, I would happily use DisplayCAL to create my 3D LUTs. Florian definitely provides better support for madVR users than either of the other two companies.

I don't know about HCFR, I haven't used it in a long time as I don't think it supports the Discus either.
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Old 14th March 2019, 17:26   #55330  |  Link
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Guys, If I choose 23hz RGB 12-bit output in nvidia.

Does that make madvr output levels in 0-4095 ?
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Old 14th March 2019, 17:54   #55331  |  Link
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as i said to you before this option currently has no effect on what madVR outputs.

12 bit is in general not on option maybe with DX13 maybe never.
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Old 14th March 2019, 18:03   #55332  |  Link
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12 bit is in general not on option maybe with DX13 maybe never.
Introducing a new surface format doesn't really require anything. It could happen tomorrow. It would just need to be specified somewhere officially and implemented by the graphics drivers.
But since 12-bit content doesn't really exist, or game rendering would want it, its doubtful anyone cares.
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Old 14th March 2019, 18:46   #55333  |  Link
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isn't that a little bit different for presentation surfaces?

we need at least a windows update too didn't we?
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Old 14th March 2019, 18:57   #55334  |  Link
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For optimal results, DWM would probably need to learn about it, not sure how dynamic it can use GPU compositing functions.
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Old 15th March 2019, 15:03   #55335  |  Link
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Is there a way to switch to 12bit mode (nvidia) automatically when video launches ?

Mpchc seems to only change resolution and refresh
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Old 15th March 2019, 15:29   #55336  |  Link
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Is there a way to switch to 12bit mode (nvidia) automatically when video launches ?

Mpchc seems to only change resolution and refresh
The thing that works for me is using older drivers, creating a 23.976 custom resolution. Then select it and change it to 12bit, then it stays that way when the custom resolution is called up on Video start.

https://imgur.com/a/v0xjNNB
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Old 15th March 2019, 15:41   #55337  |  Link
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Set 24Hz 12 bit in NCP. Then 60Hz 8 bit. When you play a 24Hz video, it will use 12 bit. If you use madVR to control refresh rates and resolution, it will auto switch desktop at 60Hz 8 bit and video at 24Hz 12 bit. Be aware the setting does not survive a reboot using any newer drivers. You have to reset it or use 385.28 which does retain the setting. 12 bit will most likely introduce banding and you are better off with 8 bit unless you have a rare true native 12 bit display. Most are 10 bit at best.
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Old 15th March 2019, 16:28   #55338  |  Link
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The thing that works for me is using older drivers, creating a 23.976 custom resolution. Then select it and change it to 12bit, then it stays that way when the custom resolution is called up on Video start.

https://imgur.com/a/v0xjNNB
So, I'm on 417.71 right now. It won't even let me select 12 bit for the custom resolution I created. Is it limited by the TV ?

Because if I select the nvidia default 23hz 4k, it will let me switch between 8 bit and 12 bit rgb full
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Old 15th March 2019, 16:33   #55339  |  Link
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So, I'm on 417.71 right now. It won't even let me select 12 bit for the custom resolution I created. Is it limited by the TV ?

Because if I select the nvidia default 23hz 4k, it will let me switch between 8 bit and 12 bit rgb full
No its limited by the drivers mostly, I think I did get it working with other drivers, but due to HDR metadata issues with others, and these work for mostly everything and I don't play games, then its the best solution for me. (385.28).

Now what you actually get out of 12bit is another matter, but no banding that I can see on my setup.
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Old 15th March 2019, 17:03   #55340  |  Link
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Because if I select the nvidia default 23hz 4k, it will let me switch between 8 bit and 12 bit rgb full
Do you use a HDMI 2.0 connection?

EDIT: Sorry I didn't got it that both are 23Hz.
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