advdef

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
              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)