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Pnmtorle User Manual(0)                                Pnmtorle User Manual(0)

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


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

       This program is part of Netpbm(1).

       This  program  converts  Netpbm  image files into Utah RLE 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 pro-
       gram into the Utah mcut or rlequant utilities.  We show an example of this later.

       -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 you specify this option, pnmtorle writes the output to this file.  If outfile is - or you don't spec-
              ify -o, pnmtorle writes the output to Standard Output.

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

          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.


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

netpbm documentation            March 31, 1994         Pnmtorle User Manual(0)