Manual Reference Pages - AVG4 (1)
avg4 - Downfilter an image by simple averaging.
outfile ] [
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
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.
Rod Bogart, John W. Peterson
Very simple minded - more elaborate filters could be implemented.
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