Need help: filter pixelation and compression artefacts on upscale

[Chocobo]

(04-27-2022, 11:48 AM)rich2005 Wrote: More information please.
Which operating system Windows 7 / 10 / 11 or linux or MacOS ?

Are you really using Gimp 2.8 ?  That can limit options
Is your image (jpg 722 x 721 pix) a clip from the times 8 up-scaled image or is it part of the pre-scaled image ?

Win10. Im sorry I should have checked before. It is 2.10.28. Here I provide an image of the exact scale I need. I want to display it on a large 4k screen.