Here's one thing I don't understand about DVD: how can some DVD titles look absolutely perfect, whereas others will have "edge enhancement", pixelation, moire effects, jagged edges, shimmering, and other nasty problems? I mean, this is supposed to be digital video, right? Isn't there one standard for how film is transferred to DVD? Shouldn't all studios be able to consistently produce "reference" DVDs? I don't get it. Can anyone explain?