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It noteworthy that the CPU version bundled with koroshell/waifu2x-converter Windows port doesn't denoise as well as the version on the http://waifu2x.udp.jp/ webserver.

It currently adds a strange grain to the image, fails to remove almost all color noise, and oversmooths more detail than the test server version, which makes me think it's literally broken.

Either it has something to do with entirely skipping the CUDA/Torch7 routine, or there is a flaw in the current implementation. Everyone should probably avoid that particular Windows version for the time being.

Edit: I see the problem. The version bundled with koroshell/waifu2x-converter(WL-Amigo) only supports the waifux2 model for filtering Y luminance, while the web version filters RGB. For obvious reasons, when filtering out heavy jpeg compression you really need those nasty color artifacts to be denoised as well.