How to make the whole screen grayscale in KDE (wayland)?

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Here is how to make the repo shared by @johnandmegh work with plasma6. This is based on Small changes to README.md to match the new branch by bmbeverst · Pull Request #2 · lliurex/kwin-grayscale-effect · GitHub, but with slight changes to adapt to plasma 6.

  1. Download the version appropriate for Plasma6 from https://github.com/lliurex/kwin-grayscale-effect/archive/refs/heads/plasma6.zip

  2. Extract the zip archive, if downloaded.


unzip kwin-grayscale-effect-plasma6.zip

  1. Enter the repository directory cd kwin-grayscale-effect-plasma6

  2. Install the plugin


kpackagetool6 --type KWin/Effect --install kwin6_effect_grayscale

Copy “kwin6_effect_grayscale/metadata.json” to “/usr/share/kwin/”, using e.g.

sudo cp metadata.json /usr/share/kwin/

Now go to system settings -> Window Management -> Desktop Effects and Enable Grayscale