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| AVG4(1) | FreeBSD 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 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. PetersonBUGS
Very simple minded - more elaborate filters could be implemented.| November 12, 1986 | 4th Berkeley Distribution |
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