And also in 2016: "Lepton image compression: saving 22% losslessly from images" https://dropbox.tech/infrastructure/lepton-image-compression-saving-22-lossless

And also in 2016: "Lepton image compression: saving 22% losslessly from images" https://dropbox.tech/infrastructure/lepton-image-compression-saving-22-losslessly-from-images-at-15mbs https://dropbox.tech/infrastructure/lepton-image-compression... It's now deprecated though and quite comically tragically they are suggesting to switch to a different format and mention JPEG XL as an alternative.