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Man Pages


Manual Reference Pages  -  AVG4 (1)

NAME

avg4 - Downfilter an image by simple averaging.

CONTENTS

Synopsis
Description
Options
See Also
Author
Bugs

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 pixels 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 improvement 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.

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1 AVG4 (1) Nov 12, 1986

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