Comment by JyrkiAlakuijala

3 months ago

When I built WebP lossless format I kept testing design decisions against PNG. The average gain against my Internet PNG test corpus was 42 % and 26.5 % if I optimized the PNGs with pngcrush and pngout (kzip). I had not yet come up with ZopfliPNG ideas, those were backports from some WebP lossless ideas into gzip and PNG.

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