pnm(5) - phpMan

The PNM Format(5)                      File Formats Manual                      The PNM Format(5)



NAME
       pnm - Netpbm superformat


DESCRIPTION
       The  PNM  format  is  just an abstraction of the PBM, PGM, and PPM formats.  I.e. the name
       "PNM" refers collectively to PBM, PGM, and PPM.

       The name "PNM" is an acronym derived from "Portable Any Map." This derivation  makes  more
       sense  if  you  consider it in the context of the other Netpbm format names: PBM, PGM, and
       PPM.

       The more general term "Netpbm format" refers to the PNM formats plus PAM.

       PNM is principally used with Netpbm(1).

       Note that besides being names of formats, PBM, PGM, PPM, and PNM are also classes of  pro-
       grams.   A  PNM  program can take PBM, PGM, or PPM input.  That's nothing special -- a PPM
       program can too.  But a PNM program can often produce multiple output formats as well, and
       a  PNM  program can see the difference between PBM, PGM, and PPM input and respond to each
       differently whereas a PPM program sees everything as if it were PPM.   This  is  discussed
       more in the description of the netpbm programs" (1).

       "pnm"  also  appears  in the names of the most general Netpbm library routines(1), some of
       which aren't even related to the PNM format.


INTERNET MEDIA TYPE
       No Internet Media Type (aka MIME type, content type) for PNM has been registered with  the
       IANA, but the value image/x-portable-anymap is conventional.

       Note that there are also conventional Internet Media Types for each of the PNM subformats.
       The recommended practice is to use those in preference to the PNM code when it  is  conve-
       nient to do so.


FILE NAME
       There are no requirements on the name of a PNM file, but the convention is to use the suf-
       fix "pbm", "pgm", or "ppm", depending on the particular subformat, or "pnm" if it  is  not
       convenient to distinguish the subformats.



SEE ALSO
       ppm(1), pgm(1), pbm(1), pam(1), programs that process PNM(1), libnetpbm(1)

DOCUMENT SOURCE
       This  manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master
       documentation is at

              http://netpbm.sourceforge.net/doc/pnm.html

netpbm documentation                     27 November 2013                       The PNM Format(5)

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