pbmtopgm, pbmtoplot, pbmtoppa, pbmtoptx, pbmupc, pgmenhance: add pages (#12224)

pages/common/pbmtopgm.md

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+# pbmtopgm
+
+> Convert a PBM image to PGM by averaging areas surrounding individual pixels.
+> See also: `pnmconvol`, `pamditherbw`.
+> More information: <https://netpbm.sourceforge.net/doc/pbmtopgm.html>.
+
+- Convert PBM image to PGM by averaging the `w`x`h`-sized area surrounding each pixel:
+
+`pbmtopgm {{w}} {{h}} {{path/to/image.pbm}} > {{path/to/output.pgm}}`

pages/common/pbmtoplot.md

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+# pbmtoplot
+
+> Convert a PBM image into a UNIX plot file.
+> More information: <https://netpbm.sourceforge.net/doc/pbmtoplot.html>.
+
+- Convert a PBM image into a UNIX plot file:
+
+`pbmtoplot {{path/to/image.pbm}} > {{path/to/output.plot}}`

pages/common/pbmtoppa.md

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+# pbmtoppa
+
+> Convert a PBM image to HP Printer Performance Architecture format.
+> More information: <https://netpbm.sourceforge.net/doc/pbmtoppa.html>.
+
+- Convert a PBM image into a PPA file:
+
+`pbmtoppa {{path/to/image.pbm}} > {{path/to/output.ppa}}`
+
+- Specify the desired dots-per-inch and paper size:
+
+`pbmtoppa -d {{300}} -s {{a4}} {{path/to/image.pbm}} > {{path/to/output.ppa}}`

pages/common/pbmtoptx.md

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+# pbmtoptx
+
+> Convert a PBM image into Printronix printer graphics.
+> More information: <https://netpbm.sourceforge.net/doc/pbmtoptx.html>.
+
+- Convert a PBM image into a PTX file:
+
+`pbmtoptx {{path/to/image.pbm}} > {{path/to/output.ptx}}`

pages/common/pbmupc.md

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+# pbmupc
+
+> Generate a PBM image of a Universal Product Code (UPC).
+> More information: <https://netpbm.sourceforge.net/doc/pbmupc.html>.
+
+- Generate a UPC image for the specified product type, manufacturer code, and product code:
+
+`pbmupc {{product_type}} {{manufacturer_code}} {{product_code}} > {{path/to/output.pbm}}`
+
+- Use an alternative style that does not display the checksum:
+
+`pbmupc -s2 {{product_type}} {{manufacturer_code}} {{product_code}} > {{path/to/output.pbm}}`

pages/common/pgmenhance.md

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+# pgmenhance
+
+> Edge-enhance a PGM image.
+> See also: `pamedge`.
+> More information: <https://netpbm.sourceforge.net/doc/pgmenhance.html>.
+
+- Edge-enhance a PGM image:
+
+`pgmenhance {{path/to/image.pgm}} > {{path/to/output.pgm}}`
+
+- Specify the level of enhancement:
+
+`pgmenhance -{{1..9}} {{path/to/image.pgm}} > {{path/to/output.pgm}}`