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  program 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:  Wher-
              ever a pixel is black, the corresponding alpha value  is  trans-
              parent.  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 specify -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)

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