A handy website called WaifuXL uses AI or something to clean up, color-correct, upscale, and enhance anime images. Above left is a very old picture of Madoka from Kimagure Orange Road I’ve had since high school. It’s a very low-resolution picture. To the right is a 4x enhanced version, courtesy of WaifuXL. (I never use the term “waifu” and it’s pretty stupid, but this website is pretty cool.)
Linna from Bubblegum Crisis. Look how blurry and low-res the original is.
Nadia taking a shower. You can see how it clears up the dithering considerably.
Nadia taking a nap. It really sharpened up the picture.
Nadia’s wedding.
Nadia wedding dress.
Komillia from Macross 2036. The original looks blurry in comparison.
Plus it works on non-character images. Look at how it cleaned up this image of a Macross Valkyrie prepping for takeoff:
This is a nice tool. Apparently it does not work on non-anime images well.