I don't feel like that page is entirely fair. The PNG and GIF comparisons are unfair; they're the same low resolution as FLIF, but given nearest-neighbor upsam

I don't feel like that page is entirely fair. The PNG and GIF comparisons are unfair; they're the same low resolution as FLIF, but given nearest-neighbor upsampling instead of bilinear. Most web browsers use bilinear or bicubic upsampling for progressive pictures now, so FLIF isn't nearly as unique as it presents itself. Aside from that, progressive is only useful if you're on a slow connection or the file is broken; in other cases re-rendering multiple times becomes a bottleneck and battery drain. In general it's rare that progressive decoding is a win anymore (although progressive encoding of JPEG is always a win). In another comment I pointed out that jpeg2000 can be encoded to any size, even 1k, even though the q-scale doesn't go that low, by using the target size parameter instead. It looks better than anything but BPG and is fully progressive. Of course, J2K is a dead format outside of DejaVu, PDF, and the medical field, but it serves as a useful baseline. A comparison to JXR would have been nice; it's an open, patent-indemnified format that fully supports progressive decoding, and compresses about as well as WebP. That format's the biggest disappointment for me, I thought it had everything in place to displace JPEG. BPG could be made somewhat progressive, but only by changing the underlying HEVC bitstream, while one of its goals is to stay as close as possible. The inclusion of a thumbnail is the only recourse.