.TH "AdvanceCOMP PNG Compression Utility" 1
.SH NAME
advpng \- AdvanceCOMP PNG Compression Utility
.SH SYNOPSIS 
advpng [\-l, \-\-list] [\-z, \-\-recompress] [\-0, \-\-shrink\-0]
.PD 0
.PP
.PD
	[\-1, \-\-shrink\-fast] [\-2, \-\-shrink\-normal [\-3, \-\-shrink\-extra]
.PD 0
.PP
.PD
	[\-4, \-\-shrink\-insane] [\-i, \-\-iter N]
.PD 0
.PP
.PD
	[\-f, \-\-force] [\-q, \-\-quiet]
.PD 0
.PP
.PD
	[\-h, \-\-help] [\-V, \-\-version] FILES...
.PD 0
.PP
.PD
.SH DESCRIPTION 
The main purpose of this utility is to recompress png
files to get the smallest possible size.
.PP
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.
.PP
To compress the files this utility uses the following
strategies:
.PD 0
.IP \(bu
Remove all ancillary chunks.
.IP \(bu
Concatenate all the IDAT chunks.
.IP \(bu
Use the 7zip Deflate implementation.
.PD
.SH OPTIONS 
.TP
.B \-l, \-\-list FILES...
List the content of the specified files.
.TP
.B \-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.
.TP
.B \-0, \-\-shrink\-store
Disable the compression. The file is
only stored and not compressed. The file is always
rewritten also if it\'s bigger.
.TP
.B \-1, \-\-shrink\-fast
Set the compression level to \[dq]fast\[dq] using the zlib
compressor.
.TP
.B \-2, \-\-shrink\-normal
Set the compression level to \[dq]normal\[dq] using the libdeflate
compressor.
This is the default level of compression.
.TP
.B \-3, \-\-shrink\-extra
Set the compression level to \[dq]extra\[dq] using the 7z
compressor.
You can define the compressor iterations with
the \-i, \-\-iter option.
.TP
.B \-4, \-\-shrink\-insane
Set the compression level to \[dq]insane\[dq] using the zopfli
compressor.
You can define the compressor iterations with
the \-i, \-\-iter option.
.TP
.B \-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.
.TP
.B \-f, \-\-force
Force the use of the new file also if it\'s bigger.
.SH COPYRIGHT 
This file is Copyright (C) 2002 Andrea Mazzoleni, Filipe Estima
.SH SEE ALSO 
advzip(1), advmng(1), advdef(1)