advdef - AdvanceCOMP Deflate Compression Utility
advdef [-z, --recompress] [-0, --shrink-store]
[-1, --shrink-fast] [-2, --shrink-normal] [-3, --shrink-extra]
[-4, --shrink-insane] [-i, --iter N]
[-f, --force] [-q, --quiet]
[-h, --help] [-V, --version] FILES...
The main purpose of this utility is to recompress the data present in the .png,
.mng, .gz, .tgz and .svgz files.
The internal structure of the files isn´t changed. Only the compressed
data is modified.
- -z, --recompress FILES...
- Recompress the specified files. If the -1, -2, -3, -4
options are specified it´s used the smallest file choice from the
previous compressed data and the new compression. If the -0 option is
specified the file is always rewritten without any compression.
- -0, --shrink-store
- Disable the compression. The file is only stored and not
compressed. The file is always rewritten also if it´s bigger.
- -1, --shrink-fast
- Set the compression level to "fast" using the
zlib compressor.
- -2, --shrink-normal
- Set the compression level to "normal" using the
libdeflate compressor. This is the default level of compression.
- -3, --shrink-extra
- Set the compression level to "extra" using the 7z
compressor. You can define the compressor iterations with the -i, --iter
option.
- -4, --shrink-insane
- Set the compression level to "insane" using the
zopfli compressor. You can define the compressor iterations with the -i,
--iter option.
- -i, --iter N
- Define an additional numer of iterations for the 7z and
zopfli compressors for modes -3 and -4. More iterations usually give a
better compression, but may require a lot more time. Try for example with
10, 15, 20, and so on.
- -f, --force
- Force the use of the new file also if it´s
bigger.
The advdef program cannot be used to recompress huge files because it needs to
allocate memory for both the complete compressed and uncompressed data.
This file is Copyright (C) 2003, 2004 Andrea Mazzoleni
advpng(1),
advmng(1),
advzip(1),
gzip(1),
bzip2(1)