Is 1366 x 768 1080i?

[GreenMotion]

Last year I bought a Panasonic TH-50PX600u and I must admit I've been very happy with it. I only recently started getting into blu-ray and have been lurking on these boards ever since.

I am learning a lot from all the posts which brings me to my subject matter.

While reading the various "is 1080p really better than 1080i" and "can you tell a difference between 1080p and 1080i" posts, I started to question some specs from my TV. I think I understand the difference between interlaced and progressive, but if it takes 1920x1080 pixes to get 1080p, I assume the same can be said for 1080i? (just interlaced).

However, my TVs resolution is 1366 x 768. So is that really 720P then? Why do the specs of my TV advertise 480i, 480p, 720p and 1080i. I am confused.

Thanks guys, and my apologies if this has been asked before. (I did do a search, but didn't find any posts that really answered this question.

[UltimateFighter]

In a word, No. That is your TV's highest progressive resolution. 1080i is 1920x1080 in an interlaced mode.

Read this for more

http://en.wikipedia.org/wiki/1080i

[matthewrounds]

What you are really wanting to know is what is the native resolution of my TV? The answer is 720p, 1080i capable meaning the pixels have the ability to "adjust" to 1080i resolution. If you have been watching HD for a whie then you can no doubt tell the difference between a FOX/ABC broadcast (720p) and an NBC/CBS broadcast 1080i. If you have not seen a lot of HD there is really no difference.

I really want to upgrade to a 1080p native set by the end of the year, but I still cannot decide if I will be able to tell a difference especially watching my BD discs. I think I will be able too, but I am not sure.

[Greenmatiz2]

Yes, you can notice a difference between 1080p and 1080i (downscaled to 1366x768) on a set larger than 40". You have to look at the very-fine details, and things in the background to notice. Things in the foreground don't look any different.

[Deciazulado]

Originally Posted by Matthew.Rounds

What you are really wanting to know is what is the native resolution of my TV? The answer is 720p, 1080i capable meaning the pixels have the ability to "adjust" to 1080i resolution. If you have been watching HD for a whie then you can no doubt tell the difference between a FOX/ABC broadcast (720p) and an NBC/CBS broadcast 1080i. If you have not seen a lot of HD there is really no difference.

I really want to upgrade to a 1080p native set by the end of the year, but I still cannot decide if I will be able to tell a difference especially watching my BD discs. I think I will be able too, but I am not sure.

The maximum possible resolution for a fixed pixel panel (like an LCD) it's it's native pixel count (768p is 768 x 1366, 720p is 720 x 1280 )and if you send it a smaller signal (like 480 x 720 it has to enlarge that by interpolation or you'll see a small image surrounded by black. It'd still be 480 in detail when upsized. It might look a little better if it uses an advanced algorythm (like bicubic and sharpening) but it will still have only the 480 resolution.

If you send it a higher resolution signal (like 1080 x 1920) to a 720 x 1280 panel it has to resize it to the panel's lower resolution. Furthermoere, in the case of 1080i it has to add a deinterlacing step in it to convert it to a progressive signal too.

Since 720 x 1280 is a TV standard, for a 768p it could go from 1080 x 1980 ->720 x 1280 first and then to 768 x 1366 instead of going directly 1080 x 1920 -> 768 x 1366.

Also if it uses the easiest way to make 1080 60i to 60p it could just use the alternating at 60Hz interlaced 540 pixel even/odd fields (that make up the whole 1080i lines) into sixty 540 x 1920 "frames" and resize that into 720 x 1280 (or 768 x 1366). In any case a 720 x 1280 or 768 x 1366 TV , is not 1080i nor 1080p, it just accepts that and resizes that to it's native resolution.



Roughly a true in/out 1080p (1:1) display is twice the resolution of 720p/768p, so you can either sit at 2/3rds the distance with a 1080p, or have a display that is 1.5x bigger diagonally, for the same subjective quality, from signals that reach the true 1080p potential. ymmv

[GreenMotion]

Wow .. all these numbers ....

With all that said though, how come 1080i still looks that much better on my TV than 720P?

[NARMAK]

I'm no expert so i could be wrong but all if not most should be capable of
1080i.

My theory is that 720p TVs are all capable of doing 1080i, because of this

1280 x 720 = 720p

1920 x 1080 = 1080p

960 x 540 x2 = 1080i.

The TV passes 960 x 540 on one pass and again in the second giving you that 1080 image albeit interlaced a la 1080i.

My theory is that they can do 1080i because they pass less than the native 1280 x 720 resolution in one pass and because they do it twice, you are able to get a 1080i image.

Back to topic. 1080i will look better when the images are more slow moving to say although i seem to watch all movies fast or slow in 1080i without problem.

[Greenmatiz2]

For whatever reason, my TV looks much better when upscaling DVDs to 1080i than when set at 720p. Even the colors are more rich, which makes no sense to me.

Max resolution is 1366x768

Must be a PS3 thing.

[takezo]

Originally Posted by UltimateFighter

In a word, No. That is your TV's highest progressive resolution. 1080i is 1920x1080 in an interlaced mode.

Read this for more

http://en.wikipedia.org/wiki/1080i

Note 1080i = 1920x540. Why? becuse that's what interlaced means. It's only displaying half the lines at a time.

Why does broadcast channels look the same at 720p and 1080i? Simple. Bitrate. HD Broadcasts are encoded in much lower bitrates that what is used on Blu-ray or HD-DVD. The diffrence in resolution between 720p and 1080i is not apparent at these low bitrates. In other words there is no diffrence.

What is superior. 1080i or 720? If your watching blu-ray. I say from my experience. 1080i looks better. Why? because downscaling 1080p encoded movie to 720p apparantly add flaws to the video quality when done on the fly. 1080i is not down scaling, it's basicaly removing half the lines and adding duplicate frames (from 24fps film to 29.99 NTSC) in a process known as teleicine. Thus the picture interity is left untouched.

But how much better is 1080p to 1080i? Why is progressive scan DVD much better than regular 480i DVD? Because of the increased resolution. You instantly double the vertical resolution going from interlaced to progressive.

[Greenmatiz2]

Wiki (although interesting and useful) is something of a fountain of misinformation. Some go as far as to call it a tragedy of sorts.

I don't take what's printed there as fact.

[darkpoet25]

Your tv's native resolution is 768p. It can display in 1080i, but you will need to set the tv's resolution to this format or on your Blu-Ray player or PS3. To get a native resolution of 1080i/p your tv would need to be 1920x1080. And yes you can tell a difference in 1080p. The video quality is mcuh smoother and cleaner with less moire pattern, aliasing, and video noise. You know what they say, once you go High Def you never go back.

[Greenmatiz2]

Actually, I went from 1080p back down to 1080i on a bigger screen. Yeah, there's a slight difference, but I wager most general consumers won't care a lot.

I watch more DVDs now that the PS3 has added upscaling. The difference between DVDs and 720p is a lot more dramatic, but I live with it.

I will rent BR's, but I'm not interested in buying a lot of them (they're not really available here in Korea, save for 25 or so Sony titles).