DragonFly On-Line Manual Pages
AdvanceCOMP Deflate Compression Utility(1) DragonFly General Commands Manual
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)
AdvanceCOMP Deflate Compression Utility(1)