tldr/pages/common/pamditherbw.md

pamditherbw

Apply dithering to a greyscale image, i.e. turn it into a pattern of black and white pixels that look the same as the original greyscale. See also: pbmreduce. More information: https://netpbm.sourceforge.net/doc/pamditherbw.html.

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

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

• Use the specified quantization method:

ppmditherbw -{{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:

ppmditherbw {{[-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:

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