advpng - AdvanceCOMP PNG Compression Utility

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

       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.

       advpng - AdvanceCOMP PNG Compression Utility

-l,--listFILES...
              List the content of the specified files.

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

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

                                                                          AdvanceCOMPPNGCompressionUtility(1)

       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...