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Old 12-04-2006, 06:33 PM   #1 (permalink)
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Default 720p and 1080i question

are they the same resolution? which on looks better?

because 720 has progressive, and 1080 is interlacing.
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Old 12-05-2006, 08:55 AM   #2 (permalink)
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the 'p' is like the native resolution. i think by 720 you mean 768...
but anyway

there are 2 different types of hi-def... this is a big secret that places like best buy dont want you to know.

there is "768p, 1080i" and "768i, 1080p" basicly the 'p' is the resolution of the tv... in other words, the actual number of pixels the tv has. the 'i' mean that it will convert this resolution to its native resolution. "True Hi-Def" is 1080p.

about half of the hi def channels out there are 1080p the rest are 768p. eventually all will be 1080p. HD-DVD and BlueRay uses 1080p.

I can only recommend buying a 1080p. it is the highest def HD tv you can buy right now. it will recieve 768 signal and convert it up to display on your screen (768i). this is far better than recieving a 1080 signal and converting down to a 768 image
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Old 12-05-2006, 12:24 PM   #3 (permalink)
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Quote:
Originally posted by cwiz
the 'p' is like the native resolution. i think by 720 you mean 768...
but anyway

there are 2 different types of hi-def... this is a big secret that places like best buy dont want you to know.

there is "768p, 1080i" and "768i, 1080p" basicly the 'p' is the resolution of the tv... in other words, the actual number of pixels the tv has. the 'i' mean that it will convert this resolution to its native resolution. "True Hi-Def" is 1080p.

about half of the hi def channels out there are 1080p the rest are 768p. eventually all will be 1080p. HD-DVD and BlueRay uses 1080p.

I can only recommend buying a 1080p. it is the highest def HD tv you can buy right now. it will recieve 768 signal and convert it up to display on your screen (768i). this is far better than recieving a 1080 signal and converting down to a 768 image
Completely wrong.

There are 5 types of signals you will get from HDTV sources.

SDTV = 480i

HDTV = 1080P > 1080i > 720P > 720i > 480P

Before I explain what i and p mean, a "scanline" is a line of pixels horizontally. For instance, if you have your computer monitor set to 800x600, then it is 800 pixels wide with 600 scanlines.

i means interlaced. Interlaced means that every other scanline of the TV is refreshed at once, then on the next refresh it refreshes the other scan lines. So if the TV has 4 scanlines, on the first refresh it will refresh line 1 and 3, and on the second refresh it will refresh 2 and 4. Standard TV is like this, and it leaves for some nasty looking horizontal flashing lines.

P means progressive scan. Progressive scan means that all the scanlines are refreshed at once. Better picture quality, and no horizontal lines.

So,

1080P means 1080 progressive scanlines.
1080i means 1080 interlaced scanlines.
720p means 720 progressive scanlines.
720i means 720 interlaced scanlines.
480p means 480 progressive scanlines.
480i means 480 interlaced scanlines.

90% of HDTV channels are 1080i.

"P" isn't the number of pixels.

"768P" isn't what he means, he means 720P.

And this is just completely wrong right here, I really have no idea what you're talking about, i has nothing to do with converting anything to anything at all.

Quote:
there is "768p, 1080i" and "768i, 1080p" basicly the 'p' is the resolution of the tv... in other words, the actual number of pixels the tv has. the 'i' mean that it will convert this resolution to its native resolution. "True Hi-Def" is 1080p.
So basically, just read my post and disregard cwiz's post because there is only one shred of truth to it at all, and that's that "True HD" is 1080P. Oh, and that Blu-Ray = 1080p, but I haven't seen an HD-DVD player that outputs 1080P, just 1080i, so yeah.
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Old 12-05-2006, 12:39 PM   #4 (permalink)
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dude, im not completely wrong.

i know p doesnt mean pixels

i was wrong about the 768p thing, there are just alot of hd tvs that play 720p on 768 verticle pixels

it is true that 1080's actual vertical pixel count is 1080 pixels
and that 720 or 768's actual vertical pixel count is 720 or 768

i was simplifying it and u want to crucify me

the fact is if he buys a 720p/1080i TV, he's not going to be watching true HDTV, hes going to be watching a down scaled version of 1080 HDTV

you were right about the HD-DVD's though, i thought they were 1080p, they'r just 720p
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Old 12-05-2006, 12:53 PM   #5 (permalink)
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Quote:
Originally posted by cwiz
dude, im not completely wrong.

i know p doesnt mean pixels

it is true that 1080p's actual vertical pixel count is 1080 pixels
and that 720p or 768p's actual vertical pixel count is 720 or 768

i was simplifying it and u want to crucify me
If by "simplifying it" you mean "lying" then I see what you mean. But clearly you didn't know what you were talking about. For instance, there isn't "768p, 1080i" and "768i, 1080p" ... you completely made that whole paragraph up.

Quote:
Originally posted by cwiz
the fact is if he buys a 720p/1080i TV, he's not going to be watching true HDTV, hes going to be watching a down scaled version of 1080 HDTV
One more thing you need to understand is that you can't get a ###i or ####i HDTV. That is just the signal being displayed. Think about it, how many pixels does it take to actually display 1080i? It takes 1920x1080 pixels, and with a panel at that resolution, there is no reason to limit it to 1080i, especially if the pixels are there. 720P and 1080i are completely different. 720P is 1280x720 progressive, 1080i is 1920x1080 interlaced, they shouldn't be referred to as "720p/1080i" because that makes it seem like they are at all the same.

But, you are right, unless he has a 1080P HDTV, there is no way he will be able to get full quality, BUT, you can't deny that any HDTV he gets will be higher quality than a regular SDTV. (unless you get a really crappy one that breaks or something) ... fact is - any HDTV signal, 480p - 1080p looks better than 480i, only thing is if you get a 1366x768 TV, you won't get the full quality out of 1080i or 1080p. It will still look great though. I watch SNL which is broadcast at 1080i on my TV in the other room which is 1366x768 and it still looks fantastic.

Quote:
Originally posted by cwiz
you were right about the HD-DVD's though, i thought they were 1080p, they'r just 720p
Yeah, I don't know what the deal is, I figured they'd both be 1080p but I guess they aren't. I'm still not going to get either of them, as I don't have a computer with a burner or anything like that so I can't copy the movies so there's no point. Plus, regular DVDs look perfectly fine to me on this TV. I got an "upconverting" DVD player with an HDMI output from woot.com for $39, I'm still waiting on it, though I don't see how it will be any better quality than progressive scan through component, as DVD's are 480p, and that's what signal I'm sending it through ... perhaps it has some post processing stuff or something.
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