RLEBG(1)RLEBG(1)NAMErlebg - generate simple backgrounds
SYNOPSISrlebg [ -l ] [ -v [ top [ bottom ] ] ] [ -s xsize ysize ] [ -o outfile
] red green blue [ alpha ]
DESCRIPTIONrlebg 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 ALSOrlesetbg(1), urt(1), RLE(5).
AUTHOR
Rod Bogart
4th Berkeley Distribution November 12, 1986 RLEBG(1)