http://waifu2x.udp.jp/

^ THIS IS SOME GOOD STUFF (just pretend it's called something else)


drawn at 100%!

and then upscaled x2 in waifu


THEN AGAIN


but if i do it in sai..

notcool

WORKS ON TRANSPARENT LINEARTS TOO
and for colored images. it's said that it doesn't work quite as well with anything soft shaded or painterly BUT IMO, still works pretty damn great. borderline flawless on hard, smooth linearts. I used the marker tool which has some opacity which explains the slight fading in the resized example images!

I HOPE YOU ENJOY