[Zlib-devel] Google's version of zlib code

[Frédéric Kayser]

Hi Glenn,
could you rerun it but force the filter 0 (none) this time? I'm no sure bzip2 and xz really benefit from the filters.

Regards
-- 
Frédéric Kayser

Le 4 mars 2013 à 07:28, glennrp at comcast.net a écrit :

> I extracted the IDAT chunk data from 1750 files from
> the Mozilla mercurial repository and recompressed them
> in various ways.  The gzip, zopfli, bzip2, and xz
> results are with the IDAT chunk data generated by
> pngcrush -brute and then decompressed, including
> only the PNG filter bytes and filtered pixel data.
> 
>      Method           time   IDAT bytes
>    original files      n/a    5019516
>    pngcrush           24.5    4299905
>    pngcrush -brute   310.8    4281038
>    gzip -9n            5.6    4339189
>    zopfli --zlib     596.7    4035633
>    bzip2 -9            3.8    4015342
>    xz                 14.6    3813468
> 
> The bzip2 and xz results include whatever overhead
> exists.  I subtracted 12 bytes per file from the
> gzip results to predict the IDAT length.
> 
> The tools for extracting the IDAT data are
> in the sourceforge pmt/pngzop project.
> 
> Glenn
> 
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