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A comment on Show HN: Kraken.io – image optimization service. Parent comment

Re:Show HN: Kraken.io – image optimization service by rb2k_ on Sunday August 11, 2013 @05:50AM (#6194528)
1-2% might be possible by using aggressive gzip encoders such as https://code.google.com/p/zopfli/

( as seen in https://github.com/sayurin/optipng-zopfli and mentioned in https://twitter.com/pornelski/status/356843309118922756 )

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Re:Show HN: Kraken.io – image optimization service by kraken-io on Sunday August 11, 2013 @06:07AM (#6194576)
We have been experimenting with Google's Zopfli but found out that the optimization time is too long for such a insignificant optimization gain.

Optimization speed has always a key factor for Kraken.io.

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Re:Show HN: Kraken.io – image optimization service by depsypher on Sunday August 11, 2013 @12:17PM (#6195271)
Another option using zopfli is pngtastic (disclaimer, my own project): https://github.com/depsypher/pngtastic

It really is significantly slower, but if you want to reduce every last byte in a png zopfli is your best bet.

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