http://www.avsforum.com/avs-vb/showthread.php?t=698612
Below is Evan Powell's (Projector Central) appraisal of the 1080i vs 1080p controversy.
Below is Evan Powell's (Projector Central) appraisal of the 1080i vs 1080p controversy.
no difference between 1080i and 1080p????
- Thread starter michaels
- Start date
EKKC
Diamond Member
- May 31, 2005
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isnt 1080i interlaced by upconverting a 720p signal into 1080 lines? and 1080p = true 1080 horizontal lines output from the source?that said, i too have no idea what the difference is, i know the technical terms, but i set my xbox media center to output at 1080i for my LCDTV, and it's a bigger resolution than 720p, showing 1080 lines the resolution is smaller than 720p, there's no upconversion anywhere because the xbox was outputting 1080. so what the hell? isn't that 1080p then?
So there's no reason to buy a TV that has 1080p? I ask since I am in the market for a new LCD and don't really know what to invest in. 1080i is good?
Whoozyerdaddy
Lifer
- Jun 27, 2005
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That was because the first generation of 1080p displays came out before there was a 1080p HDMI protocol.
The 1080p sets coming out now can accept 1080p through their HDMI inputs. Problem solved.
Most networks don't even broadcast 1080i, let alone 1080p. I think you would be hard pressed to tell a difference between 1080i and p.
silverpig
Lifer
- Jul 29, 2001
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Whoozyerdaddy
Lifer
- Jun 27, 2005
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Originally posted by: EKKC
that said, i too have no idea what the difference is, i know the technical terms, but i set my xbox media center to output at 1080i for my LCDTV, and it's a bigger resolution than 720p, showing 1080 lines the resolution is smaller than 720p, there's no upconversion anywhere because the xbox was outputting 1080. so what the hell? isn't that 1080p then?
No. 720p, 1080i and 1080p are all independent formats.
I have no idea what you are trying to ask in your second question... I read it five times.
Whoozyerdaddy
Lifer
- Jun 27, 2005
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Being that most sets are now fixed pixel displays, (LCD, DLP, Plasma) there aren't many 1080i sets out there anymore. The only 1080i sets left would be CRT based and they are fading fast. The dominant display resolutions on the market today are 720p and 1080p. If you have any technology other than CRT your display cannot be 1080i.
You're confusing display resolution with broadcast resolution. They are two different things.
Rock Hydra
Diamond Member
- Dec 13, 2004
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MrChad
Lifer
- Aug 22, 2001
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That's a good point. But I'm not sure if I would notice enough of a difference between a 1080i signal downconverted to 720p on my plasma versus the same signal displayed on a 1080p native display.
If my choice is between a high-quality 720p set with excellent color, contrast and reliability and an off-brand 1080p set, I'll choose the 720p set.
Queasy
Moderator<br>Console Gaming
- Aug 24, 2001
- 31,796
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I can't remember where I saw it mentioned, but someone in a video forum (maybe AVS) said that the only time you would notice a difference is if you had a huge TV...like 55"+.
That said, it seems like the 1080i output on the HD-DVD is beating out the 1080p Blu-Ray for picture quality because Blu-Ray is still stuck on mpeg-2 instead of an mpeg-4 format (VC1) like HD-DVD is using.
That said, it seems like the 1080i output on the HD-DVD is beating out the 1080p Blu-Ray for picture quality because Blu-Ray is still stuck on mpeg-2 instead of an mpeg-4 format (VC1) like HD-DVD is using.
If there was no difference between 1080i and 1080p as your question supposes, why would there then would there be two different ratios called 1080i and 1080p if, supposedly, they were much the same hdtv resolution standard to begin with?
You guys are all misreading what the guy said.
He's not saying that there's no difference between the standards, he's saying that there's no difference between them if you're watching a movie that's been transferred from film (24 fps, progressive). Therefore, it doesn't matter if your screen refreshes all 1080 line at once or half at a time, because there will be no change of information between the frames anyway.
He's not saying that there's no difference between the standards, he's saying that there's no difference between them if you're watching a movie that's been transferred from film (24 fps, progressive). Therefore, it doesn't matter if your screen refreshes all 1080 line at once or half at a time, because there will be no change of information between the frames anyway.
I call bullmalarkey.
I'd rather not have my display de-interlace the material and just present it untouched.
1080p for me please.
I'd rather not have my display de-interlace the material and just present it untouched.
1080p for me please.
Whether your DVD player deinterlaces it, or your TV deinterlaces it, the outcome and the output is still the same (barring any diferences in the quality of the scalers).
QED, you know full well that de-interlacers are not created equal.
Plus why go through the whole interlace/de-interlace anyway?
Plus why go through the whole interlace/de-interlace anyway?
Exactly.
It really depends on which device has the better de-interlacer whether I would output 1080i or 1080p.
Some of the first-gen 1080p TVs had horrible de-interlacers for 1080i signals-- they were literally throwing away every other frame so the net effect was what some call "540p" TV
soydios
Platinum Member
- Mar 12, 2006
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1080i and 1080p both have a display resolution of 1920 pixels wide by 1080 pixels tall.
Progressive scan refreshes all pixels at once, at I think 30 or 24 frames per second. Your computer monitor, for instance, is progressive scan, though it often refreshes at a faster rate (60Hz, 75Hz, etc.). 1080p refreshes all 1080 horizontal lines at the same time.
Interlacing is where alternating horizontal lines are refreshed, at I think 60 frames per second. First the odd lines are refreshed, then the even lines. In this way, the entire screen is completely refreshed 30 times per second. 1080i is simply 1080 lines interlaced. I witnessed a very odd effect once, and this must have been on a very large 1080i screen with a slower refresh rate, was where a bold letter "A" was displayed. It seemd to be "bouncing." I was actually observing the interlacing (hence it must have been slow refresh rate, as eyes only capture about 30 frames per second). The letter was jumping up and down by one line of resolution (hence it was a big TV, so I could actually notice the movement).
These are the formats that I know of:
- 480i, standard television, 640x480 interlaced
- *edit* 480p and 720p, apparently I was wrong on the resolutions, but they are progressive scan
- 1080i, early HDTV, 1920x1080 interlaced
- 1080p, later HDTV, 1920x1080 progressive
Progressive scan refreshes all pixels at once, at I think 30 or 24 frames per second. Your computer monitor, for instance, is progressive scan, though it often refreshes at a faster rate (60Hz, 75Hz, etc.). 1080p refreshes all 1080 horizontal lines at the same time.
Interlacing is where alternating horizontal lines are refreshed, at I think 60 frames per second. First the odd lines are refreshed, then the even lines. In this way, the entire screen is completely refreshed 30 times per second. 1080i is simply 1080 lines interlaced. I witnessed a very odd effect once, and this must have been on a very large 1080i screen with a slower refresh rate, was where a bold letter "A" was displayed. It seemd to be "bouncing." I was actually observing the interlacing (hence it must have been slow refresh rate, as eyes only capture about 30 frames per second). The letter was jumping up and down by one line of resolution (hence it was a big TV, so I could actually notice the movement).
These are the formats that I know of:
- 480i, standard television, 640x480 interlaced
- *edit* 480p and 720p, apparently I was wrong on the resolutions, but they are progressive scan
- 1080i, early HDTV, 1920x1080 interlaced
- 1080p, later HDTV, 1920x1080 progressive
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