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720p better than 1080i? Is this true? - Page 2

post #11 of 59
No, we're talking 1/60 second here.

A frame of interlaced video has even fields and odd fields. Both are encoded into one frame. If you are a moron and weave deinterlace something, then you will wind up with 30 combed frames per second. Blend deinterlacing is almost the same as weaving, but without the combing. Some people just discard half of the fields, which is gross-looking when there is motion. The proper way to deinterlace is to bob. If you bob deinterlace, even fields are picked, filled downward 1 line, and displayed for 1/60 second, and then the odd fields are picked, filled upward 1 line, and displayed for 1/60 second. You wind up with 60 progressive frames per second of half vertical detail, which the brain blends to look very close to full vertical detail, and motion is just as fluid as 720p60. The advantage of interlacing is that because fields are compressed to one frame, they share information, which makes for nice compressibility. You can interlace a 1080p24 movie to 1080i60 and lose nothing.
 
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post #12 of 59
i use a led in 1080i and it does it nicelly!is it more ressource affective?now that is a very good question!because the whole point here is to take the minimum ressource possible

if i can have a 1 million pixel data path and look as good or very close to a 2 million pixel then i am all for it!
i think the conversion all happen in the screen so the gpu sending 1million is probably right,but i aint sure here!

(i dont think there is redundancy going on here between i and p in the screen)just a conversion)

ty ramicio for the feed back!i love to have the real stuff or possibility of interlacing instead of debating witch is better!cause at the end we all want the best possible experience for our chosen toy!

when you mention bob etc isnt the new tv dispalying odd line first then even line after?so wouldnt deinterlacing etc be problematic in the new screen?
Edited by drbaltazar - 5/10/12 at 11:17am
post #13 of 59
Watch previous page cause I changed something to my post tongue.gif but was too late tongue.gif
   
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post #14 of 59
Literal: 1080p > 1080i > 720p > 720i > 480p > 480i
Perceived quality versus bandwidth: 1080i > 1080p > 720i > 720p > 480i > 480p

Interlacing is nothing more than a trick. The same goes for compression. Of course, tricks can't ever give you the quality of the original, but the perceived quality with the enormous space savings is the game that will always be played. Chroma subsampling is a trick that is hack and it absolutely ruins any cartoons for me.
 
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post #15 of 59
Quote:
Originally Posted by ASUSfreak View Post

1080p = 1080 lines per second --> EVERY second all the lines are refreshed --> resulting in lot's of data to be calculated per second

1080i = 540 (half of 1080) lines per second --> second 1 = lines 1, 2, 3, ..., 539 and second 2 = lines 2, 4, 6, ..., 540. Second 3 = lines 1,3,5,... and second 4 = lines 2, 4, 6, ... again. ETC... --> Resulting in half the data to be calculated per second

You should state that the lines are refreshed multiple times a second. If it was only once per second, the video would look awful.
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post #16 of 59
ramicio could you explain a bit more about chroma subsampling?the way you mention it seems like you suggest some might get better result by disabling it!how would a led tv plugged to a amd video card on computer go at it if he was to test ?ty again for taking time!might need this info after all lol!(sorry)
Edited by drbaltazar - 5/10/12 at 11:55am
post #17 of 59
Quote:
Originally Posted by losttsol View Post

You should state that the lines are refreshed multiple times a second. If it was only once per second, the video would look awful.

Thx wink.gif I just did it in the top of my post (so people know from the start tongue.gif)
Quote:
1080p = 1080 lines per second --> EVERY second all the lines are refreshed 50 times (Europe)/60 times (USA)--> resulting in lot's of data to be calculated per second
   
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post #18 of 59
You don't disable it. It's how video is encoded. There is a large failure in the area of PCs, HDMI, and TVs. Sometimes it's the video card that's outputting only 4:2:2, and sometimes it's the TV subsampling the input. Most often it's the TV that does not support 4:4:4. This is fine for video, because 4:2:2 is still better than 4:2:0, which is how ALL video that consumers see is sampled. It simply makes colored text against black backgrounds look like crap, which is why using TVs for monitors is a giant fail.
 
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post #19 of 59
720p will look better
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post #20 of 59
Quote:
Originally Posted by ramicio View Post

You don't disable it. It's how video is encoded. There is a large failure in the area of PCs, HDMI, and TVs. Sometimes it's the video card that's outputting only 4:2:2, and sometimes it's the TV subsampling the input. Most often it's the TV that does not support 4:4:4. This is fine for video, because 4:2:2 is still better than 4:2:0, which is how ALL video that consumers see is sampled. It simply makes colored text against black backgrounds look like crap, which is why using TVs for monitors is a giant fail.

Also because TV's uses HDMI and thats 1920x1080 thus 16:9

Monitor's can use DVI and that 1920x1200 thus 16:10

That also could give extra problems on how the viewer are seeing the images on screen...
   
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