andy_brehm
Stunt Coordinator
- Joined
- Oct 10, 2001
- Messages
- 155
i have a bit of an idea of what the HD formats are but i was wondering where i could read up to understand exactly what 1080i 720p etc are and what their sources are.
thanks
thanks
I wonder how he came up with those numbers.Your understanding is correct. I’m not sure how he came up with the numbers, but it is probably information overload.
For example VHS resolves about (I can no longer remember exactly) 300 lines. The NTSC specifications are for around 540 lines (don’t remember exactly), but only 480 for display—the others are used for sync information and text or other non-picture data. For many, many years, most TVs could not resolve even the 480 lines available for display.
DVD is 480—that is the spec and I don’t know where he would have come up with a different number.
The ATSC (digital) specifications do allow for 480p (this is what Fox broadcasts on their digital channels)—it is not HD, however. So even though it is in the digital broadcast specifications, it fails the HD definition test—which begins at 720p.