Asus XG27AQDMG Discussion

High Hz on OLED produce excellent strobeless motion blur reduction with fast GtG pixel response. It is easier to tell apart 60Hz vs 120Hz vs 240Hz on OLED than LCD, and more visible to mainstream. Includes WOLED and QD-OLED displays.
Shifroval
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Re: Asus XG27AQDMG Discussion

Post by Shifroval » 29 Oct 2024, 15:42

RealNC wrote:
29 Oct 2024, 11:47
Shifroval wrote:
29 Oct 2024, 09:08
What I want to ask now is how to better mitigate black crush in sdr? Right now I use novideo with rtings icc profile and can see only the second row in lagom test. To be precise, it's the second row minus the first square. Is it the best solution at the moment?
You can load the ICC profile in novideo_srgb and it in that mode, which also allows for gamma calibration adjustment. See the first post for instructions on where to get the profile and how to set up novideo_srgb.
Well, I did exactly this and got no results with the asus profile, but got acceptable results with rtings calibrated profile: I can see the two lower rows almost 100%. Before that I could only see the last 2 squares, maybe 3. Someone on reddit was also getting zero improvements and tried calibrating to edid primaries instead. For me that also changed nothing.
So I'm asking what result did you get after calibrating using asus provided profile. Also, do you use user mode? I switched to it immediately, but if you're using e.g racing, you may be getting different results.

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Re: Asus XG27AQDMG Discussion

Post by RealNC » 29 Oct 2024, 16:48

Shifroval wrote:
29 Oct 2024, 15:42
Well, I did exactly this and got no results with the asus profile, but got acceptable results with rtings calibrated profile: I can see the two lower rows almost 100%. Before that I could only see the last 2 squares, maybe 3. Someone on reddit was also getting zero improvements and tried calibrating to edid primaries instead. For me that also changed nothing.
So I'm asking what result did you get after calibrating using asus provided profile. Also, do you use user mode? I switched to it immediately, but if you're using e.g racing, you may be getting different results.
User mode. Racing mode has a dimmer red (look like lower luminance for red, not desaturation.) Other than that they look pretty much identical. I would say user mode seems to be the native output of the display.

In EDID mode with novideo_srgb, I can see all squares in the black level test at 120Hz. The first square is hard to tell, but it's still barely distinguishable. At 240Hz, square 5 becomes the first that I can distinguish. The lower the refresh rate gets, the lower the gamma gets as well (it's the cause of VRR flicker.)

It's important to not have an ICC profile in Windows when using novideo_srgb. Otherwise, you're getting double-clamped in browsers and image viewers (since they're color-managed applications) and possibly gamma adjustment applied twice. In the Color Management settings in Windows, make sure the list of profiles for the monitor ("profiles associated with this device") is empty.

Other than that, the relevant settings I'm using in the monitor OSD are:

Game Visual: User Mode
Shadow Boost: OFF
Brightness: 35 (desktop) / 45 (games)
Uniform Brightness: On
Contrast: 80
Display Color Space: Wide Gamut
Color Temp: User (100, 100, 100)
Saturation: 50
Six-axis Saturation: All 50
Gamma: 2.2 (sometimes 2.0, depending on content)
Screen Saver: off
Auto Logo Brightness: off

Note that if you can start distinguishing the 4th square in the black level test, that's a pretty good result already.
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Shifroval
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Re: Asus XG27AQDMG Discussion

Post by Shifroval » 30 Oct 2024, 00:40

RealNC wrote: User mode. Racing mode has a dimmer red (look like lower luminance for red, not desaturation.) Other than that they look pretty much identical. I would say user mode seems to be the native output of the display.

In EDID mode with novideo_srgb, I can see all squares in the black level test at 120Hz. The first square is hard to tell, but it's still barely distinguishable. At 240Hz, square 5 becomes the first that I can distinguish. The lower the refresh rate gets, the lower the gamma gets as well (it's the cause of VRR flicker.)
Ah, yeah, I completely forgot about oled gamma changes. True, in 120hz mode I can see all squares without touching anything in color settings. Square 1 is more like a faint frame, but if I look at it for some time, it becomes a bit easier to distinguish. Moreover, I tried upping contrast to 80 (had it at 50), as it was default when I first turned on the monitor, and now I can easily see square 3 at 240hz, that is a huge improvement.
As I said, I'm using rtings calibrated profile and it was already mitigating most of the crush, but now it became a non-issue and I can just enjoy the monitor. Thank you for reminding me about gamma and about contrast setting.

Do I need to unclamp before switching to hdr? I saw somewhere that novideo can affect hdr mode, not sure if true, at least I don't see any difference.

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Re: Asus XG27AQDMG Discussion

Post by RealNC » 30 Oct 2024, 05:59

Shifroval wrote:
30 Oct 2024, 00:40
I tried upping contrast to 80 (had it at 50), as it was default when I first turned on the monitor, and now I can easily see square 3 at 240hz, that is a huge improvement.
80 is the default though, not 50.
Do I need to unclamp before switching to hdr? I saw somewhere that novideo can affect hdr mode, not sure if true, at least I don't see any difference.
It used to not be needed, but now I'm not sure anymore. The Nvidia driver is what does the clamp to begin with, and it might have changed to not automatically disable it. So I think it's best to manually disable it just to be sure.
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Re: Asus XG27AQDMG Discussion

Post by Shifroval » 30 Oct 2024, 13:59

RealNC wrote:
30 Oct 2024, 05:59
Shifroval wrote:
30 Oct 2024, 00:40
I tried upping contrast to 80 (had it at 50), as it was default when I first turned on the monitor, and now I can easily see square 3 at 240hz, that is a huge improvement.
80 is the default though, not 50.
Do I need to unclamp before switching to hdr? I saw somewhere that novideo can affect hdr mode, not sure if true, at least I don't see any difference.
It used to not be needed, but now I'm not sure anymore. The Nvidia driver is what does the clamp to begin with, and it might have changed to not automatically disable it. So I think it's best to manually disable it just to be sure.
It was 80 by default for me too, I worded it poorly, I guess.

Ok, so far I found only one side effect of clamping. When it's enabled, all dsr/dldsr resolutions are deleted until I manually disable clamp and add them again. If I add them with clamp enabled, they're just not saved.
I was able to save them only after I tried applying clamp with nvcp open, then it stayed there no matter what I do.
Maybe related to some nvapi limitations or just a bug in novideo itself.

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Re: Asus XG27AQDMG Discussion

Post by RealNC » 30 Oct 2024, 14:14

Shifroval wrote:
30 Oct 2024, 13:59
Ok, so far I found only one side effect of clamping. When it's enabled, all dsr/dldsr resolutions are deleted until I manually disable clamp and add them again. If I add them with clamp enabled, they're just not saved.
I was able to save them only after I tried applying clamp with nvcp open, then it stayed there no matter what I do.
Maybe related to some nvapi limitations or just a bug in novideo itself.
Weird. Works fine for me.
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