Wrong/weird/off colours in KDE Plasma (X11)

asdesdq · 2025-01-02 22:01:08

Hello,
I haven't used Arch Linux in a while, and recently I reinstalled it to start using it again. After fiddling with a few things, I got it working, and have been using it fine, for the most part. However, something that I noticed, which was weird, is that occasionally the colours on images are not correct when running KDE Plasma in X11 mode. It appears to happen on all JPEGs, some PNG files, and it doesn't happen on WebP images or YouTube videos in Firefox. QEMU and Konsole both appeared to have the correct colours. For the apps and colours with issues, blue has been mostly correct other than being slightly more purple, green shows as bright yellow, and red shows as a dark green. I did have similar issues in the past, however they were not on Arch Linux, and it was the whole screen that had the messed up colours. I think it's some sort of software issue as I can take screenshots of the incorrect colours. If it helps, I am using an HP Dev One which has been mostly stock, other than me putting a different SSD and installing Arch Linux on it. It's also only in Plasma X11 where I seem to have the issue, as Plasma Wayland and GNOME both display colours properly, along with a few other DEs I tested.

lvsl · 2025-01-05 12:13:13

Since no one replied I'll give this a try. I hope you find something better than this

Firstly I got no idea what the issue is. It can be the screen, the program, basically anything that can display colors. Or maybe it's the wrong image viewer. You can try gimp first opening there instead and see if it works.
One other way I can think of is to drag the image you want to open from say, Dolphin, to chrome/chromium/firefox for example, and open the image there.

Then by then you can try using javascript to modify the css there and see what settings fit for the off color image. Especially if the color is always wrong the same way, scripts like this may help

Inside my chromium console:

Warning: Don’t paste code into the DevTools Console that you don’t understand or haven’t reviewed yourself. This could allow attackers to steal your identity or take control of your computer. Please type ‘allow pasting’ below and hit Enter to allow pasting.

allow pasting

// select everything that is wrapped with the tag <html> and apply css filter to it
  for (contentScriptHtmlElement of document.getElementsByTagName("html")) {
    contentScriptHtmlElement.style.filter = "invert(1) brightness(0.4) hue-rotate(45deg)";
  }

A few of these you can use in a css file

filter: brightness(0.4);
filter: contrast(200%);
filter: grayscale(50%);
filter: hue-rotate(90deg);
filter: invert(75%);

filter: saturate(30%);
filter: sepia(60%);

Last edited by lvsl (2025-01-05 12:26:57)

seth · 2025-01-05 16:17:29

occasionally the colours on images are not correct when running KDE Plasma in X11 mode

Please post your Xorg log, https://wiki.archlinux.org/title/Xorg#General and the output of "xrandr --prop" and ideally link some illustrative screenshots.
Might be a color range issue, https://bbs.archlinux.org/viewtopic.php … 1#p2204341 but that's hard to tell from the provided description.

Also is there any pattern to the affected clients (toolkit, opengl, vulkan, browsers, …)?

Arch Linux

#1 2025-01-02 22:01:08

Wrong/weird/off colours in KDE Plasma (X11)

#2 2025-01-05 12:13:13

Re: Wrong/weird/off colours in KDE Plasma (X11)

#3 2025-01-05 16:17:29

Re: Wrong/weird/off colours in KDE Plasma (X11)

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