A specific method can be called Pareto-optimal if no other method can achieve the same (or better) compression density in less time. There might be other methods that compress better but take more time, or that compress faster but result in larger files. But a Pareto-optimal method delivers the smallest files for a given time budget, which is why it’s called "optimal."
Medium Quality
More recently, the JPEG XL team at Google has built yet another JPEG encoder, jpegli, which is both faster and better than even mozjpeg. It is based on lessons learned from guetzli and libjxl, and offers a very attractive trade-off: it is very fast, compresses better than WebP and even high-speed AVIF, while still producing good old JPEG files that are supported everywhere.
High Quality
At this point, mozjpeg no longer beats WebP, though jpegli still does. The Pareto front is now mostly covered by JPEG XL, though for very fast encoding, good old JPEG is still best. At this quality point, AVIF is not on the Pareto front: at its slowest settings (at 0.5 Mpx/s or slower) it matches the compression density of the second-fastest libjxl setting, which is over 100 times as fast (52 Mpx/s).
Conclusion
Meanwhile, the old JPEG is still attractive thanks to better encoders. The new jpegli encoder brings a significant improvement over mozjpeg in terms of both speed and compression. Perhaps surprisingly, good old JPEG is still part of the Pareto front — when extremely fast encoding is needed, it can still be the best choice.
[^] # Re: Rappel
Posté par antistress (site web personnel) . En réponse au lien Google's Jpegli Offers ~35% Compression Improvement For High Quality JPEGs. Évalué à 5.
Morceaux choisis :
Donc WebP est out ?