NAME

       advpng - AdvanceCOMP PNG Compression Utility

SYNOPSIS

       advpng [-l, --list] [-z, --recompress] [-0, --shrink-0]
            [-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 png files to get the smallest possible size.

       Please  note  that  this utility is not able to read a generic file. It´s granted to be able to read only
       the files generated by the AdvanceMAME emulator.

       To compress the files this utility uses the following strategies:
       •      Remove all ancillary chunks.
       •      Concatenate all the IDAT chunks.
       •      Use the 7zip Deflate implementation.

OPTIONS

       -l, --list FILES...
              List the content of the specified files.

       -z, --recompress FILES...
              Recompress the specified files. If the -1, -2, -3 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.

COPYRIGHT

       This file is Copyright (C) 2002 Andrea Mazzoleni, Filipe Estima

SEE ALSO

       advzip(1), advmng(1), advdef(1)

                                                                          AdvanceCOMP PNG Compression Utility(1)