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AVG4(1)			    General Commands Manual		       AVG4(1)

NAME
       avg4 - Downfilter an image by simple averaging.

SYNOPSIS
       avg4 [ -o outfile ] [ infile ]

DESCRIPTION
       Avg4 downfilters	an RLE image into a resulting image of 1/4th the size,
       by simply averaging four	pixel values in	the input image	to  produce  a
       single  pixel in	the output.  If	the original image does	not contain an
       alpha channel, avg4 creates one by counting the number of non-zero pix-
       els in each group of four input pixels and using	the count to produce a
       coverage	value.	While the alpha	channel	produced  this	way  is	 crude
       (only  four  levels  of coverage) it is enough to make a	noticeable im-
       provement in the	edges of composited images.

OPTIONS
       infile The input	will be	read from this file, otherwise,	input will  be
	      taken from stdin.

       -o outfile
	      If  specified, output will be written to this file, otherwise it
	      will go to stdout.

SEE ALSO
       fant(1),	rlecomp(1), smush(1), urt(1), RLE(5).

AUTHOR
       Rod Bogart, John	W. Peterson

BUGS
       Very simple minded - more elaborate filters could be implemented.

4th Berkeley Distribution	 Nov 12, 1986			       AVG4(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | AUTHOR | BUGS

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