mirror of https://github.com/CrimsonTome/tldr.git
pbmnoise, pgmhist, pgmkernel, pgmnoise, pgmramp, pgmtexture: add pages; ppmhist: modify page (#12202)
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# pbmnoise
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> Generate white noise.
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> More information: <https://netpbm.sourceforge.net/doc/pbmnoise.html>.
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- Generate a PGM image containing white noise:
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`pbmnoise {{width}} {{height}} > {{path/to/output.pbm}}`
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- Specify the seed for the pseudo-random number generator:
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`pbmnoise {{width}} {{height}} -randomseed {{value}} > {{path/to/output.pbm}}`
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- Specify the desired rate of white to black pixels:
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`pbmnoise {{width}} {{height}} -ratio {{1/3}} > {{path/to/output.pbm}}`
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# pgmhist
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> Print a histogram of the values present in a PGM image.
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> See also: `ppmhist`.
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> More information: <https://netpbm.sourceforge.net/doc/pgmhist.html>.
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- Display the histogram for human reading:
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`pgmhist {{path/to/image.pgm}}`
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- Display the median grey value:
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`pgmhist -median {{path/to/image.pgm}}`
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- Display four quartile grey value:
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`pgmhist -quartile {{path/to/image.pgm}}`
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- Report the existence of invalid grey values:
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`pgmhist -forensic {{path/to/image.pgm}}`
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- Display machine-readable output:
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`pgmhist -machine {{path/to/image.pgm}}`
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# pgmkernel
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> Generate a convolution kernel to be used with `pnmconvol`.
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> See also: `pnmconvol`.
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> More information: <https://netpbm.sourceforge.net/doc/pgmkernel.html>.
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- Generate a convolution kernel:
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`pgmkernel {{width}} {{height}} > {{path/to/output.pgm}}`
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- Generate a quadratic convolution kernel:
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`pgmkernel {{size}} > {{path/to/output.pgm}}`
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- Specify the weight of the center in the generated kernel:
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`pgmkernel -weight {{value}} {{width}} {{height}} > {{path/to/output.pgm}}`
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# pgmnoise
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> Generate white noise.
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> More information: <https://netpbm.sourceforge.net/doc/pgmnoise.html>.
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- Generate a PGM image containing white noise:
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`pgmnoise {{width}} {{height}} > {{path/to/output.pgm}}`
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- Specify the seed for the pseudo-random number generator:
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`pgmnoise {{width}} {{height}} -randomseed {{value}} > {{path/to/output.pgm}}`
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# pgmramp
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> Generate a greyscale map.
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> More information: <https://netpbm.sourceforge.net/doc/pgmramp.html>.
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- Generate a left-to-right greyscale map:
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`pgmtexture -lr > {{path/to/output.pgm}}`
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- Generate a top-to-bottom greyscale map:
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`pgmtexture -tb > {{path/to/output.pgm}}`
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- Generate a rectangular greyscale map:
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`pgmtexture -rectangle > {{path/to/output.pgm}}`
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- Generate a elliptical greyscale map:
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`pgmtexture -ellipse {{path/to/image.pgm}} > {{path/to/output.pgm}}`
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- Generate a greyscale map from the top-left corner to the bottom-right corner:
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`pgmtexture -diagonal {{path/to/image.pgm}} > {{path/to/output.pgm}}`
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# pgmtexture
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> Extract textural features from a PGM image.
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> More information: <https://netpbm.sourceforge.net/doc/pgmtexture.html>.
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- Extract textural features from a PGM image:
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`pgmtexture {{path/to/image.pgm}} > {{path/to/output.pgm}}`
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- Specify the distance parameter for the feature extraction algorithm:
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`pgmtexture -d {{distance}} {{path/to/image.pgm}} > {{path/to/output.pgm}}`
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# ppmhist
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> Print a histogram of the colors present in a PPM image.
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> See also: `pgmhist`.
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> More information: <https://netpbm.sourceforge.net/doc/ppmhist.html>.
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- Generate the histogram for human reading:
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`ppmhist -nomap {{path/to/image_file.ppm}}`
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`ppmhist -nomap {{path/to/image.ppm}}`
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- Generate a PPM file of the colormap for the image, with the color histogram as comments:
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`ppmhist -map {{path/to/image_file.ppm}}`
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`ppmhist -map {{path/to/image.ppm}}`
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- Display version:
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