AdvanceCOMP PNG Compression General(CommAdvanceCOMP PNG Compression Utility(1)
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 com-
pressed. 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 com-
pressor. 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 op-
tion.
-4, --shrink-insane
Set the compression level to "insane" using the zopfli compres-
sor. 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)
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