advpng (1) Linux Manual Page
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:
- •
- 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 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)