NAME¶
advdef - AdvanceCOMP Deflate Compression Utility
SYNOPSIS¶
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...
DESCRIPTION¶
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.
OPTIONS¶
- -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 7z 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.
LIMITATIONS¶
The advdef program cannot be used to recompress huge files because it needs to
allocate memory for both the complete compressed and uncompressed data.
COPYRIGHT¶
This file is Copyright (C) 2003, 2004 Andrea Mazzoleni
SEE ALSO¶
advpng(1),
advmng(1),
advzip(1),
gzip(1),
bzip2(1)