I had a strange thought about what if my wallpaper could closer match the theme I use. Which led to an attempt at writting a program for dithering to a custom pallet. So here is a #pepperandcarrot illustration dithered to the #solarized pallet using #python and #qt via pyside6.
@cryptoxic Hehe, no problem; I like watching experimentations 🙂
Maybe a tool that could give you smoother results could be the filter Equalize HSI/HSL/HSV of GMIC (in colors) https://pixls-discuss.s3.dualstack.us-east-1.amazonaws.com/optimized/2X/a/a38cbd105c63681b39e3c15700d1c4b8f816a0ed_2_690x423.png ; it can do variation of color by range from the darker to the brighter and you can also offset; tone down, etc... Maybe a pass like this before a decimation of color could give less issue of large chroma area merging with each other.
@davidrevoy it would be nice if the boundaries were smoother.
I see QImage has some transformations and a colorspace/table attribute. But that I don't know what any of that means. Now at least I have some terminology to go look up. Thanks for the great sources to mess with and share!
] Кошка забия́ка! 
@cryptoxic First one looks like it came from a Win9x computer 
My apologies to @davidrevoy for ruining another illustration. But this one seems to hit more of the theme's pallet.