fstopgm, lispmtopgm, pgmtofs, pgmtolispm, pgmtoppm, pnmalias: add pages (#12198)

pages/common/fstopgm.md

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+# fstopgm
+
+> Convert a Usenix FaceSaver file into a PGM image.
+> See also: `pgmtofs`.
+> More information: <https://netpbm.sourceforge.net/doc/fstopgm.html>.
+
+- Convert the specified Usenix FaceSaver file into a PGM image:
+
+`fstopgm {{path/to/input.fs}} > {{path/to/output.pgm}}`

pages/common/lispmtopgm.md

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+# lispmtopgm
+
+> Convert a Lisp Machine bitmap into a PGM image.
+> See also: `pgmtolispm`.
+> More information: <https://netpbm.sourceforge.net/doc/lispmtopgm.html>.
+
+- Convert the specified Lisp Machine bitmap file into a PGM image:
+
+`lispmtopgm {{path/to/input.lispm}} > {{path/to/output.pgm}}`

pages/common/pgmtofs.md

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+# pgmtofs
+
+> Convert a PGM image to Usenix FaceSaver format.
+> See also: `fstopgm`.
+> More information: <https://netpbm.sourceforge.net/doc/pgmtofs.html>.
+
+- Convert the specified PGM image to Usenix FaceSave format:
+
+`pgmtofs {{path/to/input.pgm}} > {{path/to/output.fs}}`

pages/common/pgmtolispm.md

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+# pgmtolispm
+
+> Convert a PGM image to Lisp Machine format.
+> See also: `lispmtopgm`.
+> More information: <https://netpbm.sourceforge.net/doc/pgmtolispm.html>.
+
+- Convert the specified PGM image to Lisp Machine format:
+
+`pgmtolispm {{path/to/input.pgm}} > {{path/to/output.lispm}}`

pages/common/pgmtoppm.md

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+# pgmtoppm
+
+> Colorize a PGM image.
+> More information: <https://netpbm.sourceforge.net/doc/pgmtoppm.html>.
+
+- Map all greyscale values of the input image to all colors between the two specified colors:
+
+`pgmtoppm -black {{red}} --white {{blue}} {{path/to/input.pgm}} > {{path/to/output.ppm}}`
+
+- Map all greyscale values of the input image to colors according to the specified colormap:
+
+`pgmtoppm -map {{path/to/colormap.ppm}} {{path/to/input.pgm}} > {{path/to/output.ppm}}`

pages/common/pnmalias.md

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+# pnmalias
+
+> Apply antialiasing onto a PNM image.
+> More information: <https://netpbm.sourceforge.net/doc/pnmalias.html>.
+
+- Perform antialiasing on a PNM image, taking black pixels as background and white pixels as foreground:
+
+`pnmalias {{path/to/input.pnm}} > {{path/to/output.ppm}}`
+
+- Explicitly specify the background and foreground color:
+
+`pnmalias -bcolor {{background_color}} -fcolor {{foreground_color}} {{path/to/input.pnm}} > {{path/to/output.ppm}}`
+
+- Apply altialiasing to foreground pixels only:
+
+`pnmalias -fonly {{path/to/input.pnm}} > {{path/to/output.ppm}}`
+
+- Apply antialiasing to all surrounding pixels of background pixels:
+
+`pnmalias -balias {{path/to/input.pnm}} > {{path/to/output.ppm}}`