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)