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
       format, 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
       something  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
       correct endianness in your PGM or PPM output.

OPTIONS

       There  are  no  command line options defined specifically for pamendian, but it recognizes
       the options common to all programs based on libnetpbm (See
        Common Options ⟨index.html#commonoptions⟩ .)

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