AdvanceCOMP Deflate CompressGenerallAdvanceCOMPnDeflate Compression Utility(1)
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 previ-
ous 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 com-
pressed. 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 com-
pressor. 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 op-
tion.
-4, --shrink-insane
Set the compression level to "insane" using the zopfli compres-
sor. 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 uncom-
pressed data.
COPYRIGHT
This file is Copyright (C) 2003, 2004 Andrea Mazzoleni
SEE ALSO
advpng(1), advmng(1), advzip(1), gzip(1), bzip2(1)
AdvanceCOMP Deflate Compression Utility(1)
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