"normal" television resolution is 525 horizontal lines at 72dpi. I believe the image size of most broadcast material these days is 720x486 (a.k.a D1). DV is 640x480. The image size that can be viewed on the television is actually a few pixels less than 640x480. And just to throw this out, VHS is 320x240 - the same as mpeg1.

^billy

videoslave