RLEPATCH(1) 1 (Nov 8, 1987) RLEPATCH(1)
NAME
rlepatch - patch smaller RLE files over a larger image.
SYNOPSIS
rlepatch [ -o outfile ] infile patchfiles...
DESCRIPTION
Rlepatch puts smaller RLE files on top of a larger RLE
image. One use for rlepatch is to place small "fix" images
on top of a larger image that took a long time to compute.
Along with repos(1), rlepatch can also be used as a simple
way to build image mosaics.
Unlike rlecomp(1), rlepatch does not perform any arithmetic
on the pixels. If the patch images overlap, the patches
specified last cover those specified first.
If the input files each contain multiple images, they are
treated as streams of images merging to form a stream of
output images. I.e., the nth image in each input file
becomes part of the nth image in the output file. The
process ceases as soon as any input file reaches its end.
OPTIONS
infile
The background image will be read from this file. If
input is to be taken from stdin, "-" must be specified
here.
-o outfile
If specified, output will be written to this file,
otherwise it will go to stdout.
SEE ALSO
rlecomp(1), crop(1), repos(1), urt(1), RLE(5).
AUTHOR
John W. Peterson, University of Utah.
BUGS
Rlepatch uses the "row" interface to the RLE library. It
would run much faster using the "raw" interface,
particularly for placing small patches over a large image.
Even fixing it to work like rlecomp (which uses "raw" mode
only for non-overlapping images) would make a major
improvement.
Page 1 (printed 12/1/98)
