Manual: pamendian

Pamendian User Manual(1)			   General Commands Manual			    Pamendian User Manual(1)

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	pro‐
       grams 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 .)

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(1)