Re: 720i

["Arvid Björn" <arvidbjorn(at)gmail.com>]

Some people claim that 1080i is the same 540p, and therefor making the point that 720p is better.  But that's only true if the source is interlaced at 50Hz and you freeze the frame or you try to perform a sloppy deinterlace, that'll give you half the resolution. 
But if we're talking about movies shot progressively (or on film), and your TV can handle interlaced inputs and truly display the fields as intended, 1080p and 1080i are completely equal. 1080p25 contains the same amount of info as 1080i50, which shouldn't be a surprise. Blu-Ray movies uses 1080p24, that's even less than todays HDTV-standards, but the bit-rate is much higher, two or three times higher. So theoretically speaking, you may as well broadcast movies and progressive 24/25-material in 1080p - same amount of info.

You can inverse-telecine 1080i to 1080p without loss, and it really should be the preferred format in all situations except sports, where you might want to use the 50p for slow-motion playbacks.

I have both 720p and 1080i channels at home, 1080i is the clear winner in my book :)

On 4/6/07, John Morgan <John.Morgan(at)slcc.edu> wrote:

1280x720 (at) 60fps is legitimate. It's referred to as "720p", or if frame
rates are mentioned, 720/60p or 720/24p. 720/24p is very common. There are
no interlaced options in 720p.

The arguments about 720p being "half HD" are false. When you compare the
quality of 1080i vs 720p, considering one field of 1080i (1920x1080
interlaced) is only "half" a field by virtue of interlacing, the outcomes
are nearly equal.

Half the broadcast industry uses 720p because the data rate allows other
control signals (such as On Demand interaction) to be pushed down the pipe.
That said, the other half of the broadcast industry thinks 1080i rules. But
the REAL winner is 1080p. Broadcasters aren't using 1080p yet, but some
Blu-Ray/HDDVD titles will eventually go that route.
John

-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto: owner-xsi(at)Softimage.COM] On Behalf Of
digimata
Sent: Thursday, April 05, 2007 8:44 PM
To: XSI(at)Softimage.COM
Subject: 720i

Is 720i (1280x720 interlace) a legitimate video format?
Just about to render a 1280x720 project in XSI, it defaults to
progressive (60 frames a second)

Thanks,
Leoung
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