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pnmtorle(1)


NAME

   pnmtorle - convert a Netpbm image file into an RLE image file.

SYNOPSIS

   pnmtorle [ -h ] [ -v ] [ -a ] [ -o outfile ] [ pnmfile ]

DESCRIPTION

   This  program converts Netpbm image files into Utah RLE(5) image files.
   You can include an alpha mask.  If the input is a multiple image  file,
   the output consists of several concatenated RLE images.

   The  RLE file will contain either a three channel color image (24 bits)
   or a single channel grayscale image (8 bits)  depending  upon  the  pnm
   file  depth.   If a converted ppm is displayed on an 8 bit display, the
   image must be dithered.  In order to produce a better looking image (on
   8  bit  displays), it is recommended that the image be quantizing (to 8
   bit mapped color) prior to its display.  This may be done by piping the
   output  of this program into the Utah mcut(1) or rlequant(1) utilities.
   An example of this is shown later.

OPTIONS

   -v     This option will cause pnmtorle to operate in verbose mode.  The
          header  information  is written to "stderr".  Actually, there is
          not much header information stored in a  Netpbm  file,  so  this
          information is minimal.

   -h     This  option  allows the header of the Netpbm image to be dumped
          to "stderr" without converting the file.  It  is  equivalent  to
          using the -v option except that no file conversion takes place.

   -a     This  option  causes pnmtorle to include an alpha channel in the
          output  image.   The  alpha  channel  is  based  on  the  image:
          Wherever  a  pixel  is  black,  the corresponding alpha value is
          transparent.  Everywhere else, the alpha value is fully opaque.

   -o outfile
          If specified, the output will  be  written  to  this  file.   If
          outfile  is  "-",  or if it is not specified, the output will be
          written to the standard output stream.

   pnmfile
          The name of the Netpbm image data file to be converted.  If  not
          specified, standard input is assumed.

EXAMPLES

   pnmtorle -v file.ppm -o file.rle
          While  running  in  verbose mode, convert file.ppm to RLE format
          and store resulting data in file.rle.

   pnmtorle -h file.pgm
          Dump the header information of the Netpbm file called file.pgm.

SEE ALSO

   rletopnm(1), urt(1), RLE(5).

AUTHOR

   Wes Barris
   Army High Performance Computing Research Center (AHPCRC)
   Minnesota Supercomputer Center, Inc.



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