tldr/pages/common/pamditherbw.md

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# 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 -atkinson -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}} -value {{0.3}} {{path/to/image.pgm}} > {{path/to/file.pgm}}`