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25 lines
710 B
Bash
Executable File
25 lines
710 B
Bash
Executable File
#!/bin/sh
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# pngzop file.png > file_pz.idat
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# For use in the pngzop project
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# Copyright 2013 by Glenn Randers-Pehrson
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# Released under the pngcrush license (equivalent to the libpng license)
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# From a PNG file, finds the smallest resulting compressed IDAT
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# data from zopfli compression of filter types 0 through 4 and
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# "adaptive" (f5) filtering.
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# To do: replace the IDAT chunks in the source PNG file with the
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# result.
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for f in 0 1 2 3 4 5
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do
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rm -f pngzop-f$f-$$.png
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pngcrush -q -m 1 -f $f -force $1 pngzop-f$f-$$.png
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pngidat pngzop-f$f-$$.png
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zopfli --i25 --zlib pngzop-f$f-$$.idat
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done
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echo `ls -S pngzop-f?-$$.idat.zlib | tail -1`
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rm pngzop-f?-$$.png pngzop-f?-$$.idat pngzop-f?-$$.idat.zlib
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