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 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.

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)