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1080i vs 720p

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dafuzzbudd

Senior member
720 lines would be better than 540 right?

i read a thread talking about 1080i tv's upscaling to a false 1080p
but maybe i read it wrong

someone set me straight please
 
What are you talking about exactly?

720p is progressive scan - which means, 720 lines are on screen at once and every line is refreshed a certain number of times per second.
1080i is interlaced - which means, 1080 lines are on screen at once and every OTHER line is refreshed a certain number of times per second.

Hope that clears it up, if not, give me a direct/clear question.
 
Usually 1080i looks better, but it can depend on what you're watching and on what.

I've watched Blu-Ray movies in both 1080i and 1080p...can't really tell the difference. So I just naturally assume that 1080i looks the best out of the two, but it can depend.
 
Originally posted by: hans030390
Usually 1080i looks better, but it can depend on what you're watching and on what.

I've watched Blu-Ray movies in both 1080i and 1080p...can't really tell the difference. So I just naturally assume that 1080i looks the best out of the two, but it can depend.
Click to expand...

Wait.
1080i looks better then 1080p?

You need glasses?
I've heard, from a friend, who has tried both 720p (native res) and 1080i on his 720p display.

Apparently 1080i looked better.
 
progressive scan should look way better then interlaced. Interlaced screens only display some of the line at a time, while progressive displays all at once.
 
Originally posted by: wizboy11
Originally posted by: hans030390
Usually 1080i looks better, but it can depend on what you're watching and on what.

I've watched Blu-Ray movies in both 1080i and 1080p...can't really tell the difference. So I just naturally assume that 1080i looks the best out of the two, but it can depend.
Click to expand...

Wait.
1080i looks better then 1080p?

You need glasses?
I've heard, from a friend, who has tried both 720p (native res) and 1080i on his 720p display.

Apparently 1080i looked better.
Click to expand...

He means 720p vs. 1080i as better of the two.

I think he means

1080i about as good as 1080p to him

And since 1080p > 720p

Then 1080i > 720p
 
Originally posted by: Raider1284
progressive scan should look way better then interlaced. Interlaced screens only display some of the line at a time, while progressive displays all at once.
Click to expand...

Yeah, but 1080 displays more lines overall. I have a Sceptre 20" HDTV hooked up to my PS3; 1080i looks better, but the "flicker" is noticeable. Therefore, I prefer 720p because the loss of picture clarity and quality is barely noticeable, and it's smoother.
 
1080i can be better than 1080p if the upres engine sucks. True 1080p has twice the information of 1080i and if shot/edited well will look better.
 
Originally posted by: gsellis
1080i can be better than 1080p if the upres engine sucks. True 1080p has twice the information of 1080i and if shot/edited well will look better.
Click to expand...

False.

1080I is 1920X1080 With every lined refreshed 30 times at 60Hz (meaning one clock cycle even lines are refreshed and odd lines refreshed on the next clock cycle).

1080P is every line being refreshed being refreshed 24 or 30 a second.

They should look very similar. Though I should also note if not done well enough 1080 monitors have been known to mishandle 1080I information where playing back 1080P (24 or 30 Hz) on 1080I has almost always been faultless.
 
False.

1080I is 1920X1080 With every lined refreshed 30 times at 60Hz (meaning one clock cycle even lines are refreshed and odd lines refreshed on the next clock cycle).

1080P is every line being refreshed being refreshed 24 or 30 a second.

They should look very similar. Though I should also note if not done well enough 1080 monitors have been known to mishandle 1080I information where playing back 1080P (24 or 30 Hz) on 1080I has almost always been faultless.
Click to expand...

Huh? Have a cup of coffee and try again, I didn't understand one word of that... 🙂
 
I have a 1080P lcd and watch OTA HDTV on it on a regular basis. Some channels broadcast in 720p, some in 1080i. From couch distance (8 feet or so) the difference is negligable as far as clarity is concerned. If I get right up to the display though, 1080i looks a bit better. I think this is so because a 1080p display does not need to scale a 1080i signal (in my case, I have the digital tuner box set to output 1080i so I think the tuner is doing the scaling but scaling is scaling).

Where 720p is supposed to be better is with fast moving video. Some sports (especially sports with small objects like tennis, golf, hockey, etc) and action movies benefit from 720p because 1080i flickers more when there's more motion on screen. I can't really confirm this though, I don't watch that kind of stuff very much.
 
Originally posted by: Topweasel
Originally posted by: gsellis
1080i can be better than 1080p if the upres engine sucks. True 1080p has twice the information of 1080i and if shot/edited well will look better.
Click to expand...

False.

1080I is 1920X1080 With every lined refreshed 30 times at 60Hz (meaning one clock cycle even lines are refreshed and odd lines refreshed on the next clock cycle).

1080P is every line being refreshed being refreshed 24 or 30 a second.

They should look very similar. Though I should also note if not done well enough 1080 monitors have been known to mishandle 1080I information where playing back 1080P (24 or 30 Hz) on 1080I has almost always been faultless.
Click to expand...
Dude, read my post again. If something takes a 1080i/60 signal and creates a 1080p/30 signal and SUCKS at it, it can introduce aliasing and other issues. Most up-res engines don't, but some of the early ones could. 1080i != 1080p. Converting it can screw it up. Just like converting 480i/p to 1080p. 1080i to p will look much better. Not sure why anyone would think 480 -> 1080 will be "high def", but seen it advertised.

 
i would like to know the answer to this as well. I have a sony bravia 46inch 1080P lcd connected to dish network HD box (vip622 i believe) via HDMI. the dish network box will do 1080i and 720p but does not offer 1080P output. what would be the best setting to use? 1080i or 720p? I do know that all signals are converted by the lcd tv to progressive but would it be better to have the source at 1080i or 720p?

the wife and i compared 720p and 1080i but were unable to see a difference however we did not view both setting for very long. I currently have mine set to 1080i.
 
Originally posted by: mylok
i would like to know the answer to this as well. I have a sony bravia 46inch 1080P lcd connected to dish network HD box (vip622 i believe) via HDMI. the dish network box will do 1080i and 720p but does not offer 1080P output. what would be the best setting to use? 1080i or 720p? I do know that all signals are converted by the lcd tv to progressive but would it be better to have the source at 1080i or 720p?

the wife and i compared 720p and 1080i but were unable to see a difference however we did not view both setting for very long. I currently have mine set to 1080i.
Click to expand...

Depends on what you watch. Sports, go 720P. Movies, 1080i.
 
Watching movies on my television, 1080i does look better than 720p. But when playing the Xbox360 - 720p looks much better to me for some reason.
 
Originally posted by: adairusmc
Watching movies on my television, 1080i does look better than 720p. But when playing the Xbox360 - 720p looks much better to me for some reason.
Click to expand...

Fast motion. No flicker.
 
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