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PNMTORLE(1)					      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 quan
       tizing (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  ver
	      bose  mode.   The	 header information is written to
	      "stderr".	  Actually,  there  is	not  much  header
	      information stored in a Netpbm file, so this infor
	      mation 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.   Every
	      where 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  speci
	      fied,  the  output  will be written to the standard
	      output stream.

       pnmfile
	      The name of the Netpbm image data file to	 be  con
	      verted.	 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.

1			  March 31, 1994	      PNMTORLE(1)

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