advdef - AdvanceCOMP Deflate Compression Utility

       This file is Copyright (C) 2003, 2004 Andrea Mazzoleni

       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.

       The advdef program cannot be used to recompress huge files because it needs to allocate memory  for  both
       the complete compressed and uncompressed data.

       advdef - AdvanceCOMP Deflate Compression Utility

-z,--recompressFILES...
              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,--iterN
              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.

advpng(1), advmng(1), advzip(1), gzip(1), bzip2(1)

                                                                      AdvanceCOMPDeflateCompressionUtility(1)

       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...