ppmtospu
Convert a PPM file to an Atari Spectrum 512 image.
TLDR
Convert a PPM file to an Atari Spectrum 512 image
$ ppmtospu [path/to/input.ppm] > [path/to/output.spu]
Use a dithering matrix of the specified size (0 means no dithering)
$ ppmtospu -d[0|2|4] [path/to/input.ppm] > [path/to/output.spu]
