pamditherbw — Apply dithering to a greyscale image, i.e. turn it into a pattern of black and white pixels that loo

Read a PGM image, apply dithering and save it to a file

pamditherbw {{path/to/image.pgm}} > {{path/to/file.pgm}}

Use the specified quantization method

pamditherbw -{{floyd|fs|atkinson|threshold|hilbert|...}} {{path/to/image.pgm}} > {{path/to/file.pgm}}

Use the atkinson quantization method and the specified seed for a pseudo-random number generator

pamditherbw {{[-a|-atkinson]}} {{[-r|-randomseed]}} {{1337}} {{path/to/image.pgm}} > {{path/to/file.pgm}}

Specify the thresholding value for quantization methods that perform some sort of thresholding

pamditherbw -{{fs|atkinson|thresholding}} {{[-va|-value]}} {{0.3}} {{path/to/image.pgm}} > {{path/to/file.pgm}}