1AdvanceCOMP PNG Compression UGteinleirtayl(1C)ommaAnddvsanMcaenCuOaMlP PNG Compression Utility(1)
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NAME

6       advpng - AdvanceCOMP PNG Compression Utility
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SYNOPSIS

9       advpng [-l, --list] [-z, --recompress] [-0, --shrink-0]
10            [-1, --shrink-fast] [-2, --shrink-normal [-3, --shrink-extra]
11            [-4, --shrink-insane] [-i, --iter N]
12            [-f, --force] [-q, --quiet]
13            [-h, --help] [-V, --version] FILES...

DESCRIPTION

15       The  main purpose of this utility is to recompress png files to get the
16       smallest possible size.
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18       Please note that this utility is not able to read a generic file.  It´s
19       granted  to be able to read only the files generated by the AdvanceMAME
20       emulator.
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22       To compress the files this utility uses the following strategies:
23       ·      Remove all ancillary chunks.
24       ·      Concatenate all the IDAT chunks.
25       ·      Use the 7zip Deflate implementation.
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OPTIONS

28       -l, --list FILES...
29              List the content of the specified files.
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31       -z, --recompress FILES...
32              Recompress the specified files. If the -1, -2,  -3  options  are
33              specified  it´s  used the smallest file choice from the previous
34              compressed data and the new compression. If  the  -0  option  is
35              specified the file is always rewritten without any compression.
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37       -0, --shrink-store
38              Disable  the  compression.  The file is only stored and not com‐
39              pressed. The file is always rewritten also if it´s bigger.
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41       -1, --shrink-fast
42              Set the compression level to "fast" using the zlib compressor.
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44       -2, --shrink-normal
45              Set the compression level to "normal" using the libdeflate  com‐
46              pressor.  This is the default level of compression.
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48       -3, --shrink-extra
49              Set  the  compression  level to "extra" using the 7z compressor.
50              You can define the compressor iterations  with  the  -i,  --iter
51              option.
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53       -4, --shrink-insane
54              Set  the compression level to "insane" using the zopfli compres‐
55              sor.  You can define the  compressor  iterations  with  the  -i,
56              --iter option.
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58       -i, --iter N
59              Define  an  additional numer of iterations for the 7z and zopfli
60              compressors for modes -3 and -4.  More iterations usually give a
61              better  compression,  but  may require a lot more time.  Try for
62              example with 10, 15, 20, and so on.
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64       -f, --force
65              Force the use of the new file also if it´s bigger.
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68       This file is Copyright (C) 2002 Andrea Mazzoleni, Filipe Estima
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SEE ALSO

71       advzip(1), advmng(1), advdef(1)
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75                                        AdvanceCOMP PNG Compression Utility(1)
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