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Waifu2x - I've used the library to upscale both old photos and videos with enough success to be pleased with the results.
https://github.com/nagadomi/waifu2x
For those going down this rabbit hole, perceptual downscaling is state of the art, and the closest thing we have to a Python implementation is here (with a citation of the original paper): https://github.com/WolframRhodium/muvsfunc/blob/master/muvsf...
Other supposedly better CUDA/ML filters give me strange results.
You can find the library here: pillow-resize.
[0] https://github.com/zurutech/pillow-resize
Image resizing is one of those things that most companies seem to build in-house over and over. There are several hosted services, but obviously sending your users photos to a 3rd party is pretty weak. For those of us looking for a middle-ground: I've had great success with imgproxy (https://github.com/imgproxy/imgproxy) which wraps libvips and well maintained.