Hdtv

[garry]

This dude is basically saying that 1080i is the same as 1080p,so saying that hes mean people should use 1080i over 720p,i allways though 720p was better than 1080i.
http://ozymandias.com/archive/2006/08/14/Home-Theater-Magazine_3A00_-No-Difference-Between-1080i-and-1080p-for-Movies.aspx

Heres the orriginal blog THERE IS NO DIFFERENCE BETWEEN 1080i AND 1080p
http://blog.hometheatermag.com/geoffreymorrison/

[TMM TOM1111]

1080i is not the same as 1080p.
1080p is the better HD mode

http://en.wikipedia.org/wiki/1080i

[garry]

yeh theres that many versions of the truth out there i dont know what one to believe,some sites say 1080i is better than 720p and others say 720p is better than 1080i then i see a home theater mag site saying theres no difference between 1080i and 1080p,which if that is true it would mean it would be better to run 1080i than 720p.

I like this part where he says that there is no such thing of 1080i in most new plasmas and lcds,you only get 1080i with crt tvs.

http://blog.hometheatermag.com/geoffreymorrison/
1080i v. 1080p

Posted Mon Aug 7, 2006, 1:57 PM ET

There has been a lot of concern and confusion over the difference between 1080i and 1080p. This stems from the inability of many TVs to accept 1080p. To make matters worse, the help lines at many of the TV manufacturers (that means you, Sony), are telling people that their newly-bought 1080p displays are really 1080i. They are idiots, so let me say this in big bold print, as far as movies are concerned THERE IS NO DIFFERENCE BETWEEN 1080i AND 1080p. See, I did it in caps too, so it must be true. Let me explain (if your eyes glaze over, the short version is at the end).
For clarification, let me start by saying that there are essentially no 1080i TVs anymore. Unless you bought a CRT based TV, every modern TV is progressive scan (as in LCD, Plasma, LCOS, DLP). They are incapable of displaying a 1080i signal as 1080i. So what we’re talking about here mostly applies to people with 1080p native displays.

Movies and almost all TV shows are shot at 24 frames-per-second (either on film or on 24fps HD cameras). All TVs have a refresh rate of 60Hz. What this means is that the screen refreshes 60 times a second. In order to display something that is 24fps on something that is essentially 60fps, you need to make up, or create new frames. This is done using a method called 3:2 pulldown (or more accurately 2:3 pulldown). The first frame of film is doubled, the second frame of film is tripled, the third frame of film is doubled and so on, creating a 2,3,2,3,2,3,2 sequence. It basically looks like this: 1a,1b,2a,2b,2c,3a,3b,4a… Each number is the original film frame. This lovely piece of math allows the 24fps film to be converted to be displayed on 60Hz products (nearly every TV in the US, ever).

This can be done in a number of places. With DVDs, it was all done in the player. With HD DVD, it is done in the player to output 1080i. With Blu-ray, there are a few options. The first player, the Samsung, added the 3:2 to the signal, interlaced it, and then output that (1080i) or de-interlaced the same signal and output that (1080p). In this case, the only difference between 1080i and 1080p is where the de-interlacing is done. If you send 1080i, the TV de-interlaces it to 1080p. If you send your TV the 1080p signal, the player is de-interlacing the signal. As long as your TV is de-interlacing the 1080i correctly, then there is no difference. Check out this article http://hometheatermag.com/hookmeup/0506halfrez/ for more info on that.

The next Blu-ray players (from Pioneer and the like) will have an additional option. They will be able to output the 1080p/24 from the disc directly. At first you may think that if your TV doesn't accept 1080p, you'll miss out on being able to see the "unmolested" 1080p/24 from the disc. Well even if your TV could accept the 1080p/24, your TV would still have to add the 3:2 pulldown itself (the TV is still 60Hz). So you're not seeing the 1080p/24 regardless.

The only exception to that rule is if you can change the refresh on the TV. Pioneer's plasmas can be set to refresh at 72 Hz. These will take the 1080p/24, and do a simple 3:3 pull down (repeating each frame 3 times).

Short Version
What this all means is this:

• When it comes to movies (as in HD DVD and Blu-ray) there will be no visible difference between the 1080i signal and the 1080p signal, as long as your TV correctly de-interlaces 1080i. So even if you could input 1080p, you wouldn't see a difference (because there is none).

• There is no additional or new information in a 1080p signal from movie based content.

• The only time you would see a difference is if you have native 1080p/60 content, which at this point would only come from a PC and maybe the PS3. 1080p/60 does have more information than 1080i/30, but unless you're a gamer you will probably never see native 1080p/60 content. It is incredibly unlikely that they will ever broadcast 1080p (too much bandwidth) or that 1080p/60 content will show up on discs (too much storage space and no one is using it to record/film).

So all of you people who bought 1080p displays only to be told by the companies that you had bought 1080i TVs, relax. The TV will convert everything to 1080p. Now if you bought a TV that doesn't de-interlace 1080i correctly, well, that's a whole other story.

[Paranoid666au]

Yea 1080p is better but it's not as simple as that.

If you record in native 1080 interlace your going to get the usual problems of interlace scanning. That's because each frame is in a different place in time. Say the even lines are recorded first, then the odd lines which completed the frame. The odd frames are recorded one 60th (or 50th with PAL) of a second later. This is where 1080p or any other pro scan is better, because the entire frame is recorded at one point in time.

3:2 pull down is differnet however. Take HD DVD and Blu Ray. Movies on both formats are recorded in 1080p 24 but not many displays will work with that right now. So the 1080p 24 is converted to 1080i 60. This doesn't suffer the same problems of native 1080i because the odd and even frames are capturing the same frame, the same point in time. With 3:2 pull down 1080i output becomes virtually no different to 1080p but only because the source was 1080p in the first place. EDIT: It has to be put back together properly though!

Some HDV camers do the same thing. They record in 1080i. But they can also record in 24F. Which captures 24 pro scan frames use 3:2 pull down (inverse tellycine I believe it's called) to convert it to 1080i 60. You then converted it back to 1080 24p when you go to edit the footage.

EDIT: A lot of TV's don't have the proper 3:2 pulldown to take the 1080i and convert it back to 1080p. And a lot of sources are native 1080i anyway, not that, again most TV don't have proper de interlacing.

[Paranoid666au]

As for 720p verses 1080i, 1080i has higher resolution only on slow moving images. Fast moving images and things end up with degraded resolution -> what I said before about the odd and even frames being recorded at two points in time. So 720p should be better for fast motion.

EDIT: And what I've said so far is not realy to do with games. I have no idea how the hell games are done.

[TMM TOM1111]

yeah its mainly to do with HD tv and how it is broadcast.1080p is the most efficient broadcast of HD due to the FPS not having to be changed or something along those lines.In gaming i dont think there would be a difference

[garry]

yeh its all to confusing i thnk im better of just sticking with 720p,sometimes if a run a 360 game at 1080i i sware it looks a bit clearer but then i go back to 720p and and it looks pretty much the same so its hard to pick,i think you would have to have two of the same tvs side by side both running the same game,one in 1080i and the other in 720p to be able to really tell te difference.

[Paranoid666au]

yeah its mainly to do with HD tv and how it is broadcast.1080p is the most efficient broadcast of HD due to the FPS not having to be changed or something along those lines.In gaming i dont think there would be a difference

1080i takes up less bandwidth, because there's only half the amount of lines in each field. That's why PAL and NTSC is interlaced, the first TV's could only handle interlace (the electron gun in CRT's have to scan twice as fast in pro scan) and it's easier to broadcast and record.


I would stick to a resolution that looks best to you.