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tldr/pages/common/pamditherbw.md
Juri Dispan 6a6fc8ff86
pamditherbw: edit page; atktopbm, pamenlarge, pbmreduce, pbmtext, pbmtextps, pbmtoatk, pbmtobbnbg; add pages (#12236) 
* pamditherbw: edit page; atktopbm, pamenlarge, pbmreduce, pbmtext, pbmtextps, pbmtoatk, pbmtobbnbg; add pages

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Co-authored-by: Vitor Henrique <87824454+vitorhcl@users.noreply.github.com>
2024-02-12 15:10:11 +05:30

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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}}