It turns out, for 4:3 standard television, that static resolutions are about equal: ~330 X 330. The 330 horizontal resolution is per picture height as I mentioned earlier, or 1.33 X ~330 across the screen width. The dynamic vertical resolution (moving images) drops to about 50% of 480 scan lines.
The resolution ratios for HDTV, which I summarized here
, are for the 16:9 ratios of HDTV. Vertical resolution of 1080i images varies constantly from ~400 to ~800 (dynamic to static) as parts of the image change. Don't see any problem with that myself. The density of pixels along each horizontal line can vary all the way up to the number sampled by HDTV cameras (1920), although there's about 20% filtration in sets. The more detail the merrier. Images or the aspect ratio won't become unbalanced, just more detailed (within ATSC parameters). As movement occurs, the human eye is insensitive to details within that movement. As resolution drops, as with VHS tapes, images just appear softer because the tape system doesn't have the bandwidth to carry higher frequencies that create finer image details.
What happens with some of the new printers that print relatively few horizontal lines, but with extremely high dot densities on each line? Just more-detailed photo-like images. (Yes, photos have more actual detail.) -- John
[This message has been edited by John Mason (edited 09-30-2001).]