DragonFly On-Line Manual Pages

AdvanceCOMP PNG Compression Utility(1)       DragonFly General Commands Manual

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:
       o      Remove all ancillary chunks.
       o      Concatenate all the IDAT chunks.
       o      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)