AdvanceCOMP PNG Compression Utility

NAME

advpng − AdvanceCOMP PNG Compression Utility

SYNOPSIS

advpng [−l, −−list] [−z, −−recompress] [−0, −−shrink−0]

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:

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)