pamendian



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 multi-
       ple bytes are defined to have them in big endian (most significant byte
       first)  order.   However, there exist variations on these formats, pri-
       marily developed before official multibyte Netpbm formats existed, that
       are  identical  to  Netpbm formats in every respect except that samples
       are in little endian (least signficant 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.

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

       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 pro-
       grams  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 cre-
       ate 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.



SEE ALSO

       pnmdepth(1), rawtopgm(1), rawtoppm(1), pnm(1)



netpbm documentation             16 March 2002        Pamendian User Manual(0)

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