View Full Version : 720 vs. 1080 debate


Pages : 1 2 [3]

David Kennett
August 11th, 2005, 08:30 AM
Bill,

I have been observing AVSForum for quite a while too! Never signed up though. There have been times I wanted to say something, but so far have resisted the urge. I have never been an extremist on the 1080i - 720p issue, and for some time thought (and still do) that 1080i was a little preferable. It is only recently that I began to realize that the CRT is disappearing. Interlaced scanning was DESIGNED for the CRT, and offers some disadvantages to progressive displays.

Soon, the street price of smaller flat panel displays (up to, say 30 inches) will be less than comparable tubes, and chip projectors are about that stage now. I'll bet that manufacturing costs of the newer technologies are already less than CRTs, but there are still development costs to recoup. In the not too distant future, you will not see a CRT at Best Buy or CompUSA.

Bill Porter
August 13th, 2005, 11:21 PM
If you were to shoot both 1080i/p and 720p both at 24 fps 720p would be much lower in terms of quality.

If I'm not mistaken,

A) there's a big difference between 1080i and 1080p so those shouldn't be lumped together

B) saying 1080i @ 24fps would have much higher quality than 720p @ 24fps is half right and half wrong. It would have more temporal resolution but the quality would suffer in terms of jaggies...

Graeme Nattress
August 14th, 2005, 08:09 AM
If I'm not mistaken,
B) saying 1080i @ 24fps would have much higher quality than 720p @ 24fps is half right and half wrong. It would have more temporal resolution but the quality would suffer in terms of jaggies...

There's no such thing as 1080i24. There's 1080p24 embedded into 1080i60 with 3:2 pulldown though. If you've 720p24 and 1080p24, the temporal resolution is identical. I don't see how you think the 1080p24 in 1080i60 with 3:2 or whatever would have more jaggies just doesn't make sense. Can you explain more what you're getting at??

Graeme

Bill Porter
August 14th, 2005, 09:07 AM
Hey, I did say "If I'm not mistaken" ;-)

I was not aware there was no straight 1080i24, and that rather it is 1080p24 embedded into 1080i60. Is it captured as a true 24 fps progressive?

Graeme Nattress
August 14th, 2005, 11:31 AM
You can remove the pulldown after it's captured to get back to the original 1080p24. Obviously, some high end decks record and play 1080p24 without any pulldown, but then it's 1080p24, not 1080i60.

Graeme