advpng ‐ AdvanceCOMP PNG Compression Utility
advpng [‐l, ‐‐list] [‐z, ‐‐recompress] [‐0, ‐‐shrink‐0]
[‐1, ‐‐shrink‐fast] [‐2, ‐‐shrink‐normal [‐3, ‐‐shrink‐extra]
[‐4, ‐‐shrink‐insane] [‐f, ‐‐force] [‐q, ‐‐quiet]
[‐h, ‐‐help] [‐V, ‐‐version] FILES...
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
To compress the files this utility uses the following strategies:
· Remove all ancillary chunks.
· Concatenate all the IDAT chunks.
· Use the 7zip Deflate implementation.
‐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.
Disable the compression. The file is only stored and not
compressed. The file is always rewritten also if it’s bigger.
Set the compression level to ˝fast˝.
Set the compression level to ˝normal˝. This is the default level
Set the compression level to ˝extra˝.
Set the compression level to ˝insane˝.
Force the use of the new file also if it’s bigger.
This file is Copyright (C) 2002 Andrea Mazzoleni, Filipe Estima
advzip(1), advmng(1), advdef(1)
AdvanceCOMP PNG Compression Utility(1)