RLEBG(1) 1 (November 12, 1986) 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 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
Page 1 (printed 12/1/98)
