Is it lossless 1st of all?
Is it lossless 1st of all?
1) Not lossless as it doesn't have its own decoder. And runs on lossy-formats.
2) They claim to have a "pre-compression" algorithm that optimizes JPG files and still lets them be decoded by existing decoders. But, critically, they don't offer and example JPG files that have this applied. Instead, they show PNG files.
[edit]
Quick search says that this is their "patented" tech:
https://patents.google.com/patent/US20080260269A1
https://patents.google.com/patent/US8208740B2
its looks lossy
They say "similiar quality"
do they use their own inhouse solution, or existing one, like guetzli or smallfry..etc