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fireattack said:
It does work great when the dpi is moderate. Hard to deal with high-dpi scan though.
Yes. The noise pattern should fine enough to the filter aware it as noise.

Radioactive said:
I've never used it as people abuse it to upscale images, but these were rather interesting. What were your settings?
Like fireattack said, use only denoise filter. I applied denoise level 2 twice per each image, using waifu2x-converter-cpp