NAME
      mergechan - merge channels from several RLE
      files into a single output stream

 SYNOPSIS
      mergechan [ -a ] [ -o outfile ] infiles ...

 DESCRIPTION
      Mergechan takes input from several RLE files
      and combines them into a single output
      stream.  Each channel in the output stream
      comes from the respective filename specified
      on the input (i.e., channel zero is taken
      from the first file, channel one from the
      next, etc).  The same file can be specified
      more than once.  If the -a flag is given, the
      channels are numbered from -1 (the alpha
      channel) instead of zero.  All of the input
      channels must have exactly the same
      dimensions (use crop(1) to adjust files to
      fit each other).

      Mergechan is typically used to introduce an
      alpha mask from another source into an image,
      or combine color channels digitized
      independently.

      If -o is specified, the output will be
      written to outfile.

 SEE ALSO
      crop(1), rleswap(1), urt(1), RLE(5).

 AUTHOR
      John W. Peterson, University of Utah.

 BUGS
      Mergechan is totally ignorant of the color
      maps of the input files.

      The restriction that all input files must be
      the same size could probably be removed.








9