[gcompris-devel] Reducing size of GCompris by optimising PNG files

[Karl Ove Hufthammer]

Google has recently released their new Deflate-compatible compressor,
Zopfli:
http://googledevelopers.blogspot.no/2013/02/compress-data-more-densely-with-zopfli.html

This can also be used to reduce the size of PNG files (losslessly). 
I have done some tests on all the PNG files in GCompris, and running
TruePNG followed by PNGZopfli, the size of the files (~36.3 MiB) 
were reduced by ~7.4 MiB (though most of this came from TruePNG
optimisation).

I think this is a very worthwhile saving, and recommend using the
optimised PNG files. I have commit access to the Git repository, so 
if I get the go-ahead, I can commit the files.

-- 
Karl Ove Hufthammer
http://huftis.org/
Jabber: karl at huftis.org