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images: Optimize PNG images further with optipng and advpng.
The commands used for recompression were: optipng -zc1-9 -zm1-9 -zs0-3 -f0-5 *.png advpng -z3 *.png advpng -z4 -i500 *.png Note that advpng uses different algorithms when recompressing the image. The 3 refers to 7zip's deflate implementation, while 4 refers to Google's zopfli. For zopfli, the argument to -i specifies how many iterations to run. Signed-off-by: Rogério Brito <rbrito@ime.usp.br>
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