I'd imagine that depends on what resolution is put on the disc in the first place. HDTVs will still show a 720p picture even if it only does 1080i. It just converts it to another format (I'm guessing 1080i).Originally Posted by Vamp
Use Logic Or STFU!
I'd imagine that depends on what resolution is put on the disc in the first place. HDTVs will still show a 720p picture even if it only does 1080i. It just converts it to another format (I'm guessing 1080i).
Oh, so you don't buy a 720p TV or a 1080i TV? The signal is just in one of those and your TV adjusts accordingly?
Use Logic Or STFU!
No.
.
You can buy a tv whose max capability is 720, or one which can handle 1080, the tv will always display at its native resolution.
If a 1080 tv receives a 720 signal it will upconvert but the picture will be no better than the original signal. In fact it will be marginally worse because 1080 is not a direct multiple of 720, but the difference may not be noticable to the naked eye.
If a 720 tv receives a 1080 signal it will downconvert, but the picture can never be better than the native resolution. Again it will actually be slightly worse for the same reasons.
The difference between i and p is more subtle, and actually refers to the frame rate not the screen size. With interleaved only half the information is transmitted at any one time.
A 1080 transmission could have the following frame rates and types:
30i, 29.97i, 30p, 29.97p, 24p, 23.976p.
By contrast, a 720 transmission could have:
60p, 59.94p, 30p, 29.97p, 24p, 23.976p.
Note that the 1080 transmission doesn't have 60p or 59.94p because the data rate would be too high. Similarly the 720 transmission doesn't have 30i or 29.97i because the picture quality would be too low.
Progressive transmissions are likely to be used for shows with a lot of high speed motion such as sports shows, interleaved is more likely to be used for slower motion shows such as movies.
.Political correctness is based on the principle that it's possible to pick up a turd by the clean end.
Wouldn't i framerate be 60? (60i, not 30i) seeing as an NTSC framerate of 30FPS is being shown in 60 half frames?
.
No.
Each half frame is called a field, and contains either the odd numbered lines or the even numbered lines. You need both fields to make a frame. Although you get 60 fields per second, you've still only got 30 frames so the framerate is still 30i.
.Political correctness is based on the principle that it's possible to pick up a turd by the clean end.
Confused: So why would progressive scan which draws all the lines in one pass be at 60?
.
1280 columns x 720 lines x 60p frames = 55296000 pixels / sec
1920 columns x 1080 lines x 30p frames = 62208000 pixels / sec
1920 columns x 540 lines x 2 fields x 30i frames = 62208000 pixels / sec
It's got nothing to do with progressive or interleaved. 720 at 60fps is a lower data rate than 1080 at 30fps, the data rate would be too high for 1080 at 60fps. Note that the data rate for 1080@30p and 1080@30i are nominally the same.
.Political correctness is based on the principle that it's possible to pick up a turd by the clean end.
T__________________T
Biostar XE T5
i5-750 @ 4.0 GHZ stable (CM Hyper 212)
2 x 2GB Cosair XMS3 DDR3 1600MHZ
Radeon 5850 @ 866/1254MHZ
Intel X25-M in RAID 0
WD Caviar Black 2TB in RAID 0
3 x Asus 25.5" VW266H LCD [Eyefinity]
.
You must have a pretty high data rate to see all those stars.
.Political correctness is based on the principle that it's possible to pick up a turd by the clean end.
Posting Permissions
Reply With Quote
Bookmarks