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21 lines
946 B
Markdown
21 lines
946 B
Markdown
# pamditherbw
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> 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.
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> See also: `pbmreduce`.
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> More information: <https://netpbm.sourceforge.net/doc/pamditherbw.html>.
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- Read a PGM image, apply dithering and save it to a file:
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`ppmditherbw {{path/to/image.pgm}} > {{path/to/file.pgm}}`
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- Use the specified quantization method:
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`ppmditherbw -{{floyd|fs|atkinson|threshold|hilbert|...}} {{path/to/image.pgm}} > {{path/to/file.pgm}}`
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- Use the atkinson quantization method and the specified seed for a pseudo-random number generator:
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`ppmditherbw {{[-a|-atkinson]}} {{[-r|-randomseed]}} {{1337}} {{path/to/image.pgm}} > {{path/to/file.pgm}}`
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- Specify the thresholding value for quantization methods that perform some sort of thresholding:
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`ppmditherbw -{{fs|atkinson|thresholding}} {{[-va|-value]}} {{0.3}} {{path/to/image.pgm}} > {{path/to/file.pgm}}`
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