Nicer progressive display is possible in JPEG already: https://imageoptim.com/progressiveblurdemo.html https://imageoptim.com/progressiveblurdemo.html it's on

Nicer progressive display is possible in JPEG already: https://imageoptim.com/progressiveblurdemo.html https://imageoptim.com/progressiveblurdemo.html it's only a limitation of libjpeg that smoothing of early progressive scans is weak and incomplete, and thus looks very blocky. I wish browsers improved implementation of this. Partially loaded DCT coefficients correspond quite well to maximum possible image resolution, so it is known how much cross-block smoothing needs to be applied to get nearly-optimal smooth preview. There's even an implementation of that idea: http://johncostella.webs.com/unblock/ http://johncostella.webs.com/unblock/