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 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.

COPYRIGHT

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

SEE ALSO

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

                                                           AdvanceCOMP PNG Compression Utility(1)