This is only marginally related to my previous thread about 480p, so I'm going to just create a new thread. I was wondering why 720x480 was selected as the resolution for DVD. It seems to be a very awkward resolution. Assuming 480 lines as the base numeric (NTSC obviously), a standard TV (4:3) would be a resolution of 640x480. Obviously 640x480 is a very common computer resolution, so a resolution of 640x480 would have made sense. Now enters the widescreen TV at 16:9 (1.78:1). One would think that the 720x480 resolution would be meant for widescreen TVs; however, a 16:9 AR with a 480 line base would actually yield an expected resolution of 853x480. Upon some further mathematical calculations, 720x480 turns out to be an aspect ratio of 1.5:1, which is not even a half-way point between 1.33:1 and 1.78:1. So, the resolution of 720x480 seems to be a very, very awkward resolution to use as the NTSC DVD standard. Does anyone have some insight as to why this resolution was selected?