Help with calibration- Screen tinted green

[lindicles]

I have an Asus Proart PX13 laptop, with a hybrid GPU, (Nvidia) but AMD is the main one connected to the laptop Screen,
I’m running Ubuntu 25.10, with regular Gnome 49, on Wayland.
I bought a Calibrite Display Pro HL to use with the flatpak version of DisplayCAL.

My display is meant to be DCI-P3 compatible (I think), and I use it for digital art. But at the moment, I’ve reached the point where I don’t even care about the fine calibration, the screen is so obviously green tinted that anyone can see it when compared with another monitor (not so much that I think there is hardware issue – greys still look grey more or less to the untrained eye)

I’ve tried all sorts of things online guides suggest, but I can’t get it remove the green tint with any ICC file it generates, and there doesn’t seem to be a way to control the laptop display colors in the same way you would an external monitor, so I can’t do the interactive display adjustment step.

Any advice?

Calibrite Display Pro HL on Amazon   Calibrite Display SL on Amazon  
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[Vincent]

1. which colorimeter correction and you using and for which backlight?
2. is your linux system able to load VCGT into GPU?

[lindicles]

Thanks for replying!
1. saw a video on youtube outlining rough guidance, which led me to choose “Spectral: RGB OLED family (Sony PVM-2541, Samsung Galaxy S7, Lenovo LEN4140)” as my laptop display is an OLED. Not sure what you are asking when you say “for which backlight”
2. Unfortunately I don’t know how to tell if my system can do that – Whilst I am by no means new to Linux, Searching online about these display related things, makes it incredibly hard to find any useful info.

Let me know if you think this is not the correct forum to be asking for advice on my issue in.

[Vincent]

Thanks for replying!
1. saw a video on youtube outlining rough guidance, which led me to choose “Spectral: RGB OLED family (Sony PVM-2541, Samsung Galaxy S7, Lenovo LEN4140)” as my laptop display is an OLED. Not sure what you are asking when you say “for which backlight”

WOLED or RGB OLED?
If RGB oled seems ok unless there is a custom CCSS for your model.

If color cast in white persist after calibration and appling  VCGT calibration, then do a visual whitepoint match to a display that is calibrated to D65 (or that looks like D65) and recalibrate to those alternative whitepoint coordinates.

2. Unfortunately I don’t know how to tell if my system can do that – Whilst I am by no means new to Linux, Searching online about these display related things, makes it incredibly hard to find any useful info.

Let’s say that uncalibrated you have a very distictive green color cast and on “RGB gain” popup window your device can measure and show it. Huge green bar over the others.

Laptops usually do not have RGB gain controls to fix whitepoint, so when you chose D65 as calibration target and RGB gain popup showed up, there is nothing user can do. So you click continue calibration. DisplayCAL will do the whtepoint correction using VCGT, like if it was correcting some other grey.
So if after calibration and activation of new display ICC there is no change in whitepoint, your OS is not being able to load grey calibration into GPU… and that’s your OS fault.

Of course you must choose D65 as target whitepoint, not default settings “as measured” for whitepoint. That’ won’t correct white, just make all greys match whitepoint and behave like certain gamma power law.

• This reply was modified 6 months, 4 weeks ago by Vincent.
• This reply was modified 6 months, 4 weeks ago by Vincent.

[DaniJ]

As color correction behavior on Wayland is still somewhat of a mystery, here is a sample VCGT profile to test it.

If loading it darkens the screen a bit, VCGT can be used to correct your green color cast. If nothing happens when loading it… it’s complicated.

Attachments:

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[lindicles]

Thanks Vincent, your reply is what helped me – I didn’t realise you could manually put in the chromaticity coordinates and do visual white point matches, rather than just the color temperature. That is what helped me fix the visible color cast.

I also calibrated my fairly cheap LCD monitors, which is what made me realise the other reason I thought the color was off… I have no other high quality displays in my house, but with such a big difference between a proper dci-p3 monitor and literally everything else, I don’t know if I can go back…lol

*sigh* I can see more money haemorrhaging from my wallet soon…

• This reply was modified 6 months, 4 weeks ago by lindicles.

[lindicles]

And thank you DaniJ, your sample confirmed that VCGT works for me!

[Vincent]

Remember that if you calibrate to alternative whitepoints you should not use “absolute colorimetric” on LUT3D creation, in LUT3Ds from some std D65 colorspaces like Rec709/SRGB because your manually tweaked whitpoint will be undone.
You should aim to relative whitepoint intents (easiest) or use alternative Rec709 colorspaces with modifies whitepint, mayeb created with synthetic ICC profile creator.
I’ll go for the easiest.

IDNK which Linux software can use LUT3D excluding Resolve and maybe Kodi, but just in case you need it: alt whitepoint => no abs colorimetric LUT3D

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