[PCM2]

Good questions, I’ve moved them into this thread.

1. Is the SDR ICC profile at all used for HDR content in Windows?
Yes it is used, if you’ve activated the profile when running HDR then certain corrections (useful and not so useful) will be applied. The ‘ColorControl’ program and Windows HDR Calibration app mentioned earlier in the thread both rely on the use of ICC profiles under HDR.

2. Are there any differences in HDR handling between Windows 10 and Windows 11 if one skips the HDR calibration?
Not as far as I’m aware.

3. Does W11 HDR calibration have any impact on gaming on the monitor if most of the games have their own built-in calibration? I assume it’s more useful for TVs?
The extent of ‘calibration’ you can do in-game varies between games, it’s commonly a brightness calibration reference for a 10% white window size but not always. The Windows HDR Calibration app allows adjustment based on a 10% white window, 100% white window and also gives a small degree of saturation enhancement if you so desire. See my earlier posts on this thread regarding limitations of this tool and the ‘ColorControl’ alternative (depending on the monitor, one approach or the other may be more useful or neither may be useful).

4. In case of this monitor, in the DisplayHDR mode almost all the control settings are locked – does it mean it’s “calibrated”? Do RGB settings for SDR have impact on HDR colour temperature?
Yes, that’s the manufacturer HDR calibration. If colours controls are locked off, for example, the manufacturer doesn’t support those being changed under HDR. Depending on the monitor the PQ curve(s) and brightness may be optimised for a specific white point. You can adjust the white point via ICC profile or other software intervention, but it could easily upset the image in various ways that slight colour channel adjustment on the monitor itself (if available) wouldn’t.

[radosuaf]

Thanks for the answers! Strict and on point as always. It’d be great if you’d compile this into an article, should you have some time and willingness to do it :). Reddit posts are full of “I think”, “I would”, “in my opinion” – there’s a general lack of knowledge in the subject. And there are not many trusted sites that do not go too technical for the general public.

[PCM2]

I will consider at some point. For now at least, I am pointing people towards this thread in the ICC profile article. 🙂

[Danielopi]

I know its been a bit since you commented Dato, but I just had a very similar upgrade as you! (I changed my C27FG73FQN) It’s funny the points you make about the monitor are my exact reactions LOL.
But I did have a question regarding the correct color calibration for the monitor, and I was wondering what did you ultimately do. Did you make an ICC profile for it? What settings did you change inside the monitor’s adjustments? and what are your thoughts on the settings for Overdrive and Local Dimming?
Rn I like the look of the HDR content (though is my first experience with HDR so maybe it might not be correctly calibrated) but my SDR looks maybe too dark? Idk the colors don’t fully sit right with me. But any tips that you have since you’ve had it for much longer now I would highly appreciate!
I’m currently using somebody else’s ICC profile I found online along with the settings they provide (except for the color temperature since it looks weird to me).

[Dato]

If you asking about ktc monitor
By default gamma in sdr and hdr modes are way off
I calibrate monitor and create 3d luts for this two modes
Then I active my luts using program DWM_Lut (from author of no video-srgb)
For sdr in windows I assign synthetic icc profile, for programs that use it
Calibrate sdr mode for 200 nirs
Happy)

[extralarge3]

Hi everyone,
I’ve just upgraded my old Dell U2711 to a KTC M27T20. My overall findings are that the hardware itself is really capable, but the firmware and the calibration is just bad out of the box. I got the monitor with the EU firmware, that had way off EDID primaries, and noticable color banding when not using the built in “professional” color modes. I flashed the US firware (V1.2.1A) and applied an ICC profile for this monitor that i found online (by techless), now the EDID primaries seem correct, the banding is mostly gone, and the whole SDR presentation is OK i would say. (The gradient handling is still not as good as the H-IPS panel in my U2711 had, and it still looks a bit oversharpended, but the contrast, the britghness and the high refresh rate already make a big diference) The HDR presentation however is still not really good, due to the strong black crushing this monitor has (On this test pattern all bars are completely black for me). I’ve tried the HDR calibration feature in Colorcontrol, by lowering the gamma parameter i could make black crushing much better, but then obviously EOTF tracking at higher brightness became completely off. DWM_Lut looks promising, but unfortunately I don’t have a display calibrator device to generate the .cube LUT files. Dato, you mentioned that you are using this tool, could you share your LUT files? Of course there might be device to device variances, but I guess it would be still worth a try.

[flakyferr]

This thread fully matches my experience with this monitor and is very interesting.
My monitor came with EU version 2.0.4 and I am currently experiencing problems related to the color calibration, especially in HDR, hues seem shifted and saturated. The white point seems shifted towards red, and skin tones are unnaturally pinkish. Apart from that I am experiencing no other problems. Does anyone else have experience with this EU firmware version?

[Dato]

Here my luts for DWM_Lut, three for sdr (sRGB, DisplayP3, Rec.2020) and one for hdr
(link expired).

[seriong_hoo]

thanks for the video taht’s help a lot

[PCM2]

Glad it was helpful!

[uj2002]

Hi, Dato could you please reupload the luts?
This monitor is driving me insane, I dont have much experience with HDR monitors but for reasons i had to order 3 m27t20 and the last one i received is definitely the worst in terms of firmware, theres black crush, white over-saturation and when HDR is on colors are just terrible as other have said.

[Dato]

Here my luts for DWM_Lut, three for sdr (sRGB, DisplayP3, Rec.2020) and one for hdr
https://fex.net/s/mkb1yb3

[uj2002]

Thank you very much, your profiles are the only thing able to fix this monitor, sadly i noticed that DWMLUT breaks G-Sync and I lose like 10 fps.

Is there an alternative? I tried novideo sRGB but instead of limiting the colors it makes them even more saturated, i think the primaries of the monitor are wrong.

Using an icc profile in novideo sRGB instead of EDID doesn’t fix the loss of detail in the whites, i’m at a loss here, the black crush is fixable by putting 45% contrast in the nvidia control panel, but I have no idea how to fix the whites, as i said the only thing able to fix them is your profile, what is it doing exactly?

[Author]

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