I have some images saved, in the past I reduced the size of the images a lot to save disk space (for example, I reduced an image from 3840x2160 to 1280x720, that is, 200% reduction).
Now I need to go back to the original size, and well, that's a problem, because I kept these images for other people, and these people want the original image (they cannot suspect that the image quality has been reduced).
I know it is impossible to increase with the original quality, but what is the best algorithm to increase the size of images in Gimp to get as close to the original? To me, NoHalo looks the best, the others seem to blur the image.
There are some sites that promise to increase quality using AI for free, but what is the guarantee of privacy? I don't want private images stored or posted around. And it is very suspicious of a website doing this for free.
Now I need to go back to the original size, and well, that's a problem, because I kept these images for other people, and these people want the original image (they cannot suspect that the image quality has been reduced).
I know it is impossible to increase with the original quality, but what is the best algorithm to increase the size of images in Gimp to get as close to the original? To me, NoHalo looks the best, the others seem to blur the image.
There are some sites that promise to increase quality using AI for free, but what is the guarantee of privacy? I don't want private images stored or posted around. And it is very suspicious of a website doing this for free.