Hans-Christoph Steiner a6653300e8 zopfli compress PNGs in this repo to reduce to 50-90% of original ...

zopfli is a compression algorithm that optimizes the standard ZIP DEFLATE
compression. All of this is visually lossless, except for two minor things:

* lossy_transparent: remove colors behind alpha channel 0. No visual
  difference, removes hidden information.

* lossy_8bit: convert 16-bit per channel image to 8-bit per channel.

This was done using the 'zopfli' package in Debian/buster, invoking this way:
zopflipng --iterations=50 --filters=01234mepb --lossy_8bit --lossy_transparent -y $f ${f}.zopfli.png

2017-10-10 17:27:52 +02:00

33 KiB

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