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?
I also found this: https://www.anyrec.io/image-upscaler/
It looks like it did a good job The windmill was less than 1/4 of the whole image.
And it seems to be free - but it will only handle a picture that is 300x300 px.
P.S. Here is the original image: