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RLEBG(1)							      RLEBG(1)

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 com‐
       positing	 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
	      512×480.

       -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 frac‐
	      tions 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 out‐
	      file is "-", or if it is not specified, the output will be writ‐
	      ten to the standard output stream.

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

AUTHOR
       Rod Bogart

4th Berkeley Distribution      November 12, 1986		      RLEBG(1)
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