1) Binhex 
In image processing, hqx (`hq` stands for `high quality` and `x` stands for magnification) is one of the pixel art scaling algorithms developed by Maxim Stepin, used in emulators such as Nestopia, FCEUX, higan, Snes9x, ZSNES and many more. There are three hqx filters: hq2x, hq3x, and hq4x, which magnify by factor of 2, 3, and 4 respectively....