Hqx
IMAGE SCALING ALGORITHM FOR PIXEL ART
Hq3x; Hq2x; HQX; Hq4x; Hqnx; Scalehq
In image processing, hqx ("high quality scale") 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 defined: hq2x, hq3x, and hq4x, which magnify by factor of 2, 3, and 4 respectively.