darksoul16
Re:Lepton image compression: saving 22% losslessly from images at 15MB/s
on Saturday July 16, 2016 @06:45AM (#12105918)
The best I've seen is a new compressor at
http://encode.ru/threads/2459-EMMA-Context-Mixing-Compressor
Can also recompress GIF and some RAW formats, but is much, much slower