NAME
      rlespiff - Use simple contrast enhancement to
      "spiff up" an image.

 SYNOPSIS
      rlespiff [ -b blacklevel ] [ -s ] [ -t threshold ] [ -w whitelevel ] [
      -o outfile ] [ infile ]

 DESCRIPTION
      Rlespiff "spiffs up" an image by stretching
      the contrast range so that the darkest pixel
      maps to black and the lightest to white.  If
      the -s flag is given, the color channels will
      be treated separately.  This will likely
      cause some drastic color shifts.

 OPTIONS
      -b blacklevel
           The darkest input pixel will map to this
           pixel value in the output image.  The
           default is 0.

      -s   If specified, each color channel will be
           mapped separately.

      -t threshold
           This argument controls the number of
           samples of a pixel value that should be
           considered insignificant (and will
           therefore be ignored).  It is specified
           in pixels/million.  A threshold of 4
           applied to a 512x512 image would mean
           that any value that existed at only one
           pixel would be ignored.  The default
           value is 10.

      -w whitelevel
           The lightest input pixel will map to
           this pixel value in the output image.
           The default is 255.

      -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.

      infile
           The input will be read from this file.
           If infile is "-" or is not specified,
           the input will be read from the standard
           input stream.

 SEE ALSO
      urt(1), RLE(5).

 AUTHOR
      Spencer W. Thomas











































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