Some of the photos I take, to get the subject large enough in the frame I have to use electronic zoom. I don’t have money for a nice zoom lens. I tried using an adapter for one of Dad’s zoom lenses but it sometimes gives me issues. So I use a 4x zoom - which basically cuts off 3/4 of my sensor then expands the picture to full size (I guess by some sort of averaging math to create the discarded pixels)
Is there anything I can do in post to get some of that resolution back - even if it made up. I am a Linux user, so a workflow in GIMP would be great, or any other Free/Libre software you might suggest?
It seems Upscayl is cloud based, and as such has an ongoing cost… (Like everything today: Don’t sell the steak, sell the sizzle) What comes in these Appimages, Flatpacks and other packages you mentioned?
The cloud version is paid, but the desktop versions are free and available on the downloads page. Or you can build it from source.