Whats the diff between 1080i and 1080p besides the p?

Discussion in 'Games' started by G5Unit, Nov 26, 2005.

  1. G5Unit macrumors 68020

    G5Unit

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    #1
    I know the i stands for interlaced, but what does that really meen? Are there any screenshots that compare the 2?(On the xbox 360)
     
  2. risc macrumors 68030

    risc

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  3. G5Unit thread starter macrumors 68020

    G5Unit

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    #3
    Oh sry duh. I forgot. But will thr ps3 really have any advantage over the xbox because it can do progressive?
     
  4. GFLPraxis macrumors 604

    GFLPraxis

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    #4
  5. G5Unit thread starter macrumors 68020

    G5Unit

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    #5
  6. risc macrumors 68030

    risc

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    #6
    The xbox does 720p and the fact that the PS3 is capable of doing 1080p doesn't mean developers will use the format, if you remember back to the PS3 "demos" (and I use the word lightly) the stuff shown using the new Unreal engine was all at 720p.
     
  7. G5Unit thread starter macrumors 68020

    G5Unit

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    #7
    So even if I have a TV capable or 1080i, can I still play a slightly blurry 720p?
     
  8. GFLPraxis macrumors 604

    GFLPraxis

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    #8
    A great article on the subject:
    http://www.projectorcentral.com/video_signals.htm

    Some quotes:
    EDTV is 480p.


    http://en.wikipedia.org/wiki/Progressive_scan

     
  9. risc macrumors 68030

    risc

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    #9
    You really have no idea about HD do you? 1080i would be blurry not 720p, 720p is progressive scan 1080i is interlaced.

    Here is a picture of the 360 running 720p

    [​IMG]

    and here is it is in SD still progressive scan

    [​IMG]

    Obvisouly both will look better than this because this was taken straight off a tv. In real life I'm sure 720p just looks amazing.
     
  10. Flying Llama macrumors 6502a

    Flying Llama

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    #10
    I think he meant blurry because of the lower resolution.
     
  11. GFLPraxis macrumors 604

    GFLPraxis

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    #11
    Well, interlaced is what you see on a normal TV, 480i, it just goes really fast (sixty fields per second, those images shown are slow motion and show about six fields).

    The 360 supports 720p, which is lower resolution but a higher framerate (60 frames per second instead of 60 fields (half frames) per second), brighter, looks better in motion and removes the jaggies caused by interlacing, so many feel 720p looks better than 1080i.


    The PS3 supports 1080p, 1080i, 720p, 480p, and 480i (SD).
    The 360 supports 1080i, 720p, 480p, and 480i (SD).


    No; some HDTV's support both 1080i and 720p, and others support only 1080i. Check which your TV does.

    However, all HDTV's will support 480p. So I'd say test. Compare 480p and 1080i and check if you have 720p. See which looks better; higher framerate and brighter image/contrast or higher resolution.
     
  12. risc macrumors 68030

    risc

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    #12
    A TV that can do 1080i and 720p but not 1080p is going to have a native resolution of 720p, imo that makes 720p the better choice.
     
  13. GFLPraxis macrumors 604

    GFLPraxis

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    #13
    Well when you think about it, even though 720p is a lower resolution, because it does a full frame instead of fields you are seeing more pixels per second.
     
  14. gnasher729 macrumors Pentium

    gnasher729

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    #14
    In the real world, interlaced doesn't look that terrible at all. In the examples that you saw, it looked like the screen was erased first, then the first half of scanlines filled in, then the next half. In reality, one half of scanlines overwrites the screen, then the other half overwrites the other half. There are two passes, but each pass is twice as fast as with progressive.

    When progressive is exactly half done with a frame, the top half is from the new frame, the bottom half still from the old frame. With interlaced, every even line is from the new frame, every odd line from the old frame.
     
  15. clayj macrumors 604

    clayj

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    #15
    Short answer: 1080p will look marginally smoother (less jumpy) than 1080i because there will be no interlacing.

    Long answer: Of course, the reality is that pretty much all plasma TVs, and most LCD TVs, don't even have 1080 lines of resolution in the first place: most of them have 768 lines of resolution, so a 1080 signal is getting downconverted to 720 anyway. This is why ABC and FOX, for example, broadcast their HD content in 720p instead of 1080i... the 1080i usually gets dropped to 720i (effectively) when TVs can't show all 1080 lines. If you can't show all 1080 lines, the best thing to do is to show what you can (720 lines) in the best format (progressive). So, 720p is often BETTER than 1080i (and just as good as 1080p, when it comes along).

    Only when TVs have 1080 lines will the 1080p really be any better than 720p.
     

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