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>
This commit is contained in:
Rogério Brito 2014-02-24 17:17:01 -03:00
parent d553f18625
commit 22817277c6
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