>>2190310>>2190314With digital anime there really isn't a lot you can do to improve the picture if it isn't already blu-ray quality.
Most older early digital works that are re-released as blu-ray are just put through an upscaling program. The worst example of this I've seen is the Negima! which literally looks like it was run through Waifu2x too many times, the linework is all screwed up and blurry whenever it's in motion.
