> > I'm thinking that the confusion is that you're thinking of this as audio or other wave-based signals > Doesn't most lossy image compression make the same a

> > I'm thinking that the confusion is that you're thinking of this as audio or other wave-based signals > Doesn't most lossy image compression make the same assumption, e.g. JPEG? Yes, but the key difference is that there's no temporal component; the wave is across the screen, not across time. When one speaks of a low-pass filter in image processing, it's generally operating on the horizontal- and vertical-axes, not the time-axis. To put "not wave-based" in to other words: Unlike audio, video across time is neither continuous nor band-limited.