pbmnoise, pgmhist, pgmkernel, pgmnoise, pgmramp, pgmtexture: add pages; ppmhist: modify page (#12202)

pages/common/pbmnoise.md

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+# pbmnoise
+
+> Generate white noise.
+> More information: <https://netpbm.sourceforge.net/doc/pbmnoise.html>.
+
+- Generate a PGM image containing white noise:
+
+`pbmnoise {{width}} {{height}} > {{path/to/output.pbm}}`
+
+- Specify the seed for the pseudo-random number generator:
+
+`pbmnoise {{width}} {{height}} -randomseed {{value}} > {{path/to/output.pbm}}`
+
+- Specify the desired rate of white to black pixels:
+
+`pbmnoise {{width}} {{height}} -ratio {{1/3}} > {{path/to/output.pbm}}`

pages/common/pgmhist.md

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+# pgmhist
+
+> Print a histogram of the values present in a PGM image.
+> See also: `ppmhist`.
+> More information: <https://netpbm.sourceforge.net/doc/pgmhist.html>.
+
+- Display the histogram for human reading:
+
+`pgmhist {{path/to/image.pgm}}`
+
+- Display the median grey value:
+
+`pgmhist -median {{path/to/image.pgm}}`
+
+- Display four quartile grey value:
+
+`pgmhist -quartile {{path/to/image.pgm}}`
+
+- Report the existence of invalid grey values:
+
+`pgmhist -forensic {{path/to/image.pgm}}`
+
+- Display machine-readable output:
+
+`pgmhist -machine {{path/to/image.pgm}}`

pages/common/pgmkernel.md

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+# pgmkernel
+
+> Generate a convolution kernel to be used with `pnmconvol`.
+> See also: `pnmconvol`.
+> More information: <https://netpbm.sourceforge.net/doc/pgmkernel.html>.
+
+- Generate a convolution kernel:
+
+`pgmkernel {{width}} {{height}} > {{path/to/output.pgm}}`
+
+- Generate a quadratic convolution kernel:
+
+`pgmkernel {{size}} > {{path/to/output.pgm}}`
+
+- Specify the weight of the center in the generated kernel:
+
+`pgmkernel -weight {{value}} {{width}} {{height}} > {{path/to/output.pgm}}`

pages/common/pgmnoise.md

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+# pgmnoise
+
+> Generate white noise.
+> More information: <https://netpbm.sourceforge.net/doc/pgmnoise.html>.
+
+- Generate a PGM image containing white noise:
+
+`pgmnoise {{width}} {{height}} > {{path/to/output.pgm}}`
+
+- Specify the seed for the pseudo-random number generator:
+
+`pgmnoise {{width}} {{height}} -randomseed {{value}} > {{path/to/output.pgm}}`

pages/common/pgmramp.md

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+# pgmramp
+
+> Generate a greyscale map.
+> More information: <https://netpbm.sourceforge.net/doc/pgmramp.html>.
+
+- Generate a left-to-right greyscale map:
+
+`pgmtexture -lr > {{path/to/output.pgm}}`
+
+- Generate a top-to-bottom greyscale map:
+
+`pgmtexture -tb > {{path/to/output.pgm}}`
+
+- Generate a rectangular greyscale map:
+
+`pgmtexture -rectangle > {{path/to/output.pgm}}`
+
+- Generate a elliptical greyscale map:
+
+`pgmtexture -ellipse {{path/to/image.pgm}} > {{path/to/output.pgm}}`
+
+- Generate a greyscale map from the top-left corner to the bottom-right corner:
+
+`pgmtexture -diagonal {{path/to/image.pgm}} > {{path/to/output.pgm}}`

pages/common/pgmtexture.md

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+# pgmtexture
+
+> Extract textural features from a PGM image.
+> More information: <https://netpbm.sourceforge.net/doc/pgmtexture.html>.
+
+- Extract textural features from a PGM image:
+
+`pgmtexture {{path/to/image.pgm}} > {{path/to/output.pgm}}`
+
+- Specify the distance parameter for the feature extraction algorithm:
+
+`pgmtexture -d {{distance}} {{path/to/image.pgm}} > {{path/to/output.pgm}}`

pages/common/ppmhist.md

@@ -1,15 +1,16 @@
 # ppmhist
 
 > Print a histogram of the colors present in a PPM image.
+> See also: `pgmhist`.
 > More information: <https://netpbm.sourceforge.net/doc/ppmhist.html>.
 
 - Generate the histogram for human reading:
 
-`ppmhist -nomap {{path/to/image_file.ppm}}`
+`ppmhist -nomap {{path/to/image.ppm}}`
 
 - Generate a PPM file of the colormap for the image, with the color histogram as comments:
 
-`ppmhist -map {{path/to/image_file.ppm}}`
+`ppmhist -map {{path/to/image.ppm}}`
 
 - Display version: