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I wonder how Dropbox's Lepton[1] compresses JPEGs encoded using Guetzli. Since they already pack more info/byte would there be noticeable compression? Someone
by ktta 10y ago
I wonder how Dropbox's Lepton[1] compresses JPEGs encoded using Guetzli. Since they already pack more info/byte would there be noticeable compression?
Someone out there must have tried this.
[1]:https://blogs.dropbox.com/tech/2016/07/lepton-image-compression-saving-22-losslessly-from-images-at-15mbs/ https://blogs.dropbox.com/tech/2016/07/lepton-image-compress...
- Scaevolus 10y agoI'd expect it to still save >20%. Lepton uses arithmetic encoding instead of Huffman (-10%), and predicts each 8x8 block based on its neighbors (-20%). Guetzli shouldn't interfere with either of these.
- JyrkiAlakuijala 10y agoWhen we pack guetzlified JPEGs we see slightly smaller wins than with stock JPEGs. Think -14% for guetzlified JPEGs vs. -20% libjpeg JPEGs.