Free Lossless Image Format
This is really interesting. One of the most interesting parts is the progressive decoding/responsive images. http://flif.info/example.php (go to the bottom of the page).Basically, the last example shows that, if you want a scaled version of the image, you can simply stop decompressing. No need for multiple image files. Just create one with very high quality and decompress until you get the quality you want and scale it down with html.edit: more info on the responsive side of FLIF: http://flif.info/responsive.php