Alright so as promised I'll discuss Jpeg XL here. It's basically the successor to the old JPG image format that's been optimized to align with human cone cells so it ends up representing human vision better than other image formats.

However the benefit doesn't stop there because in addition to this it's backwards compatible with existing JPG images via lossless recompression. So you save like 20-30% file size with 0 quality loss.

Sadly it hasn't gained much adoption because it's rumored that google sabotaged the whole thing despite being a key player in it's creation.