pnmtorast, pnmtorle, pnmtosgi, pnmtosir, rasttopnm, rletopnm, sgitopnm, sirtopnm: add pages (#11410)

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/pnmtorast.md

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+# pnmtorast
+
+> Convert a PNM file to a Sun rasterfile.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtorast.html>.
+
+- Convert a PNM image to a RAST image:
+
+`pnmtorast {{path/to/input.pnm}} > {{path/to/output.rast}}`
+
+- Force either `RT_STANDARD` or `RT_BYTE_ENCODED` form for the output:
+
+`pnmtorast -{{standard|rle}} {{path/to/input.pnm}} > {{path/to/output.rast}}`

pages/common/pnmtorle.md

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+# pnmtorle
+
+> Convert a PNM file to an Utah Raster Tools RLE image file.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtorle.html>.
+
+- Convert a PNM image to an RLE image:
+
+`pnmtorle {{path/to/input.pnm}} > {{path/to/output.rle}}`
+
+- Print PNM header information to `stdout`:
+
+`pnmtorle -verbose {{path/to/input.pnm}} > {{path/to/output.rle}}`
+
+- Include a transparency channel in the output image in which every black pixel is set to fully transparent and every other pixel is set to fully opaque:
+
+`pnmtorle -alpha {{path/to/input.pnm}} > {{path/to/output.rle}}`

pages/common/pnmtosgi.md

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+# pnmtosgi
+
+> Convert a PNM file to an SGI image file.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtosgi.html>.
+
+- Convert a PNM image to an SGI image:
+
+`pnmtosgi {{path/to/input.pnm}} > {{path/to/output.sgi}}`
+
+- Specify whether or not compression should be used:
+
+`pnmtosgi -{{verbatim|rle}} {{path/to/input.pnm}} > {{path/to/output.sgi}}`
+
+- Write the specified string into the SGI image header's `imagename` field:
+
+`pnmtosgi -imagename {{string}} {{path/to/input.pnm}} > {{path/to/output.sgi}}`

pages/common/pnmtosir.md

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+# pnmtosir
+
+> Convert a PNM file to a Solitaire Image Recorder file.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtosir.html>.
+
+- Convert a PNM image to a SIR image:
+
+`pnmtosir {{path/to/input.pnm}} > {{path/to/output.sir}}`

pages/common/rasttopnm.md

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+# rasttopnm
+
+> Convert a Sun rasterfile to a PNM file.
+> More information: <https://netpbm.sourceforge.net/doc/rasttopnm.html>.
+
+- Convert a RAST image to a PNM file:
+
+`rasttopnm {{path/to/input.rast}} > {{path/to/output.pnm}}`
+
+- Use the color map indices in the raster if they are color values:
+
+`rasttopnm -index {{path/to/input.rast}} > {{path/to/output.pnm}}`

pages/common/rletopnm.md

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+# rletopnm
+
+> Convert a Utah Raster Tools RLE image file to a PNM file.
+> More information: <https://netpbm.sourceforge.net/doc/rletopnm.html>.
+
+- Convert an RLE image to a PNM file:
+
+`rletopnm {{path/to/input.rle}} > {{path/to/output.pnm}}`
+
+- Create a PGM image containing the RLE file's alpha channel:
+
+`rletopnm -alphaout {{path/to/alpha_file.pgm}} {{path/to/input.rle}} > {{path/to/output.pnm}}`
+
+- Operate in verbose mode and print the contents of the RLE header to `stdout`:
+
+`rletopnm -verbose {{path/to/input.rle}} > {{path/to/output.pnm}}`

pages/common/sgitopnm.md

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+# sgitopnm
+
+> Convert an SGI file to a PNM file.
+> More information: <https://netpbm.sourceforge.net/doc/sgitopnm.html>.
+
+- Convert an SGI image to a PNM file:
+
+`sgitopnm {{path/to/input.sgi}} > {{path/to/output.pnm}}`
+
+- Display information about the SGI file:
+
+`sgitopnm -verbose {{path/to/input.sgi}} > {{path/to/output.pnm}}`
+
+- Extract channel n of the SGI file:
+
+`sgitopnm -channel {{n}} {{path/to/input.sgi}} > {{path/to/output.pnm}}`

pages/common/sirtopnm.md

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+# sirtopnm
+
+> Convert a Solitaire Image Recorder file to a PNM file.
+> More information: <https://netpbm.sourceforge.net/doc/sirtopnm.html>.
+
+- Convert a SIR image to a PNM file:
+
+`sirtopnm {{path/to/input.sir}} > {{path/to/output.pnm}}`