NAME
      rlebg - generate simple backgrounds

 SYNOPSIS
      rlebg [ -l ] [ -v [ top [ bottom ] ] ] [ -s xsize ysize ] [ -o outfile
      ] red green blue [ alpha ]

 DESCRIPTION
      rlebg generates a simple background.  These
      are typically used for compositing below
      other images.  The values red green blue
      specify the pixel values (between 0 and 255)
      the background will have.  If alpha is not
      specified, it defaults to 255 (full
      coverage).  rlebg generates both constant
      backgrounds and backgrounds with continuous
      ramps.

 OPTIONS
      -s xsize ysize
           This is the size of the background
           image.  The default is 512x480.

      -l   Generate a linear ramp of pixel values.
           If no ramp flag is given, rlebg
           generates a constant background.

      -v top bottom
           Generate a variable ramp, using a
           quadratic function (this looks best with
           gamma corrected images).  top and bottom
           are the fractions of the full color
           values at the top and bottom of the
           image.  The defaults are 1.0 0.1,
           respectively.  If both -v and -l are
           given, then a linear ramp function is
           used instead of a quadratic ramp.

      -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.

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

 AUTHOR
      Rod Bogart

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