pamendian(1) - phpMan

Pamendian User Manual(0)                                                 Pamendian User Manual(0)



NAME
       pamendian - reverse endianness of a Netpbm image


SYNOPSIS
       pamendian


DESCRIPTION
       This program is part of Netpbm(1).

       All Netpbm formats that have samples in pure binary format with multiple bytes are defined
       to have them in big endian (most significant byte  first)  order.   However,  there  exist
       variations  on these formats, primarily developed before official multibyte Netpbm formats
       existed, that are identical to Netpbm formats in every respect except that samples are  in
       little endian (least significant byte first) order.

       pamendian  reverses  the  byte order of the sample to convert between the two formats.  If
       the input is true PAM, PGM, or PPM, the output is the little endian variation on that for-
       mat, and vice versa.

       The X Window System viewer xv expects the little endian variation of PGM and PPM.

       Programs  that  come  with  the Independent Jpeg Group's JPEG library are known to use the
       little endian variation of PGM and PPM.

       The reason some programs use this variant is that at one time during Netpbm's dark age(1),
       there was a version of Netpbm around that used it.  But it was never formally specified.

       This program takes input only on Standard Input.  Its output is always on Standard Output.

       You  should never have to use this program with images generated by programs in the Netpbm
       package or programs that use the Netpbm libraries.  If you do, that probably  means  some-
       thing  needs  to be fixed in those programs.  The Netpbm converter for any graphics format
       that represents numbers in little endian form should properly reverse the bytes to  create
       correct Netpbm output.

       If you create a Netpbm image from a generic stream of samples, using rawtopgm or rawtoppm,
       use options on those programs to declare the endianness of your input, thus creating  cor-
       rect endianness in your PGM or PPM output.


SEE ALSO
       pamdepth(1), rawtopgm(1), rawtoppm(1), pnm(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/pamendian.html

netpbm documentation                      16 March 2002                  Pamendian User Manual(0)

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