||FreeBSD General Commands Manual
avg4 - Downfilter an image by simple averaging.
avg4 [ -o outfile ] [ infile ]
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.
fant(1), rlecomp(1), smush(1), urt(1),
Rod Bogart, John W. Peterson
Very simple minded - more elaborate filters could be implemented.
- The input will be read from this file, otherwise, input will be taken from
- -o outfile
- If specified, output will be written to this file, otherwise it will go to
Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.