[saltysalty]

I am not an expert, but AFAIK JPEG is a lossy format. The comparison is purely based on the size, and I couldn't find anything in the paper about data loss compared to other encoders. Can someone please explain why is this a fair comparison?

[janwas]

We did an experiment with comparisons of Guetzli and (slightly larger) libjpeg output: https://arxiv.org/abs/1703.04416 Turns out that 75% of the 614 ratings are in favor of the Guetzli version.