You're right in practise (AFAIK, libjpeg still doesn't support this mode), but see http://en.wikipedia.org/wiki/Lossless_JPEG
> No you can't. You can use Lossless JPEG
You're right in practise (AFAIK, libjpeg still doesn't support this mode), but see http://en.wikipedia.org/wiki/Lossless_JPEG