1AdvanceCOMP Deflate CompressiGoenneUrtailliCAtodymv(ma1an)ncdesCOMMaPnuDaelflate Compression Utility(1)
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NAME

6       advdef - AdvanceCOMP Deflate Compression Utility
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SYNOPSIS

9       advdef [-z, --recompress] [-0, --shrink-store]
10            [-1, --shrink-fast] [-2, --shrink-normal] [-3, --shrink-extra]
11            [-4, --shrink-insane] [-i, --iter N]
12            [-f, --force] [-q, --quiet]
13            [-h, --help] [-V, --version] FILES...

DESCRIPTION

15       The  main  purpose of this utility is to recompress the data present in
16       the .png, .mng, .gz, .tgz and .svgz files.
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18       The internal structure of the files isn´t changed.  Only the compressed
19       data is modified.
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OPTIONS

22       -z, --recompress FILES...
23              Recompress  the  specified  files. If the -1, -2, -3, -4 options
24              are specified it´s used the smallest file choice from the previ‐
25              ous compressed data and the new compression. If the -0 option is
26              specified the file is always rewritten without any compression.
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28       -0, --shrink-store
29              Disable the compression. The file is only stored  and  not  com‐
30              pressed. The file is always rewritten also if it´s bigger.
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32       -1, --shrink-fast
33              Set the compression level to "fast" using the zlib compressor.
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35       -2, --shrink-normal
36              Set  the compression level to "normal" using the libdeflate com‐
37              pressor.  This is the default level of compression.
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39       -3, --shrink-extra
40              Set the compression level to "extra" using  the  7z  compressor.
41              You  can  define  the  compressor iterations with the -i, --iter
42              option.
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44       -4, --shrink-insane
45              Set the compression level to "insane" using the zopfli  compres‐
46              sor.   You  can  define  the  compressor iterations with the -i,
47              --iter option.
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49       -i, --iter N
50              Define an additional numer of iterations for the 7z  and  zopfli
51              compressors for modes -3 and -4.  More iterations usually give a
52              better compression, but may require a lot more  time.   Try  for
53              example with 10, 15, 20, and so on.
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55       -f, --force
56              Force the use of the new file also if it´s bigger.
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LIMITATIONS

59       The  advdef  program cannot be used to recompress huge files because it
60       needs to allocate memory for both the complete  compressed  and  uncom‐
61       pressed data.
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64       This file is Copyright (C) 2003, 2004 Andrea Mazzoleni
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SEE ALSO

67       advpng(1), advmng(1), advzip(1), gzip(1), bzip2(1)
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71                                    AdvanceCOMP Deflate Compression Utility(1)
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