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PNMTORLE(1)									      PNMTORLE(1)

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

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

       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  con-
       catenated 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  dis-
       played  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

       -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.

	      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.

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

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

1					  March 31, 1994			      PNMTORLE(1)
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