Keys: 1: B/W monochrome 2: 3-Bit RGB 3: Random colour palette 4: CMYK 5: Gameboy 6: HTML colours (the 16 with names) 7: Commodore 64 (16 colours) Press "I" to import an image in @layzej s image format. You can use his image scanner to scan your own images: https://scratch.mit.edu/projects/66980580/ Algorithm based on works by by Robert Floyd and Louis Steinberg. Update 13.06.16 - Added Option to change Resolution (Key R) - Added Option to change Colour Distance Algorithm (Key D, be warned, deltaE1994 is very slow!) - Added Commodore 64 palette thanks @layzej for implementing the 3 algorithms for colour distance in https://scratch.mit.edu/projects/113496817/