1280 x 720 vs. 1280 x 768

Discussion in 'Computers' started by MarkHastings, Jan 30, 2006.

  1. MarkHastings

    MarkHastings Executive Producer

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    So all of these high def tv's say they are 1280x768, but all of the high def videos (WMV files) are in a 1280x720 format.

    Can anyone explain what this means? I understand the 720p resolution because that works out to 16x9, but why are the montiors 1280x768?

    The other question I have is: Is the 1280x720 a square pixel or rectangular pixel acpect ratio???

    This is a bit confusing because I want to play a file on a screen that is 1280x768, but since all of the WMV files seem to be targeting 1280x720, should I also be targeting this size?

    And if I do target that size, do I need to worry about square or rectangular pizels? Do WMV files even support square or rectangular pixels?

    Or is this one of those cases where 1280x720 is the correct aspect ratio and while the screen will show black bars on top and bottom, the overscan will cover that all up???

    There are probably a lot of other questions that need to be asked, but I figured I'd start the ball rolling with the above.
     
  2. DaveF

    DaveF Moderator
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    This is a typical "computer" resolution, supported by many monitors and video cards. I would guess that the display systems are cross-designed for computer use, and so often are built according to the older VGA resolutions rather than the newer HD resolutions. But I'm just guessing.

    And I know even less about the rest of your questions...
     
  3. MarkHastings

    MarkHastings Executive Producer

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    After researching Microsoft's site, it does appear that 1280x720 is the HD spec. That does seem to make some sense and I wouldn't doubt it.

    Actually, if I recall, don't computer monitors work best when divisible by 16?

    720 / 16 = 45
    768 / 16 = 48

    and then,

    45 / 16 = 2.8125
    48 / 16 = 3


    I'm not sure if the above math means anything, but if the '16 pixel' rule means anything, that 768 would look a lot easier to deal with than the 720.
     
  4. Francois Caron

    Francois Caron Cinematographer

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    A 1280x720 monitor is a 16:9 aspect ratio device while a 1280x768 monitor is actually a 16:9.6 aspect ratio device. I've had a heck of a time wondering why so many 16:9 sources were being displayed with black bars until I did the math and corrected the resolution on my video card.
     
  5. DaveF

    DaveF Moderator
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    Yes, it's the 720p spec.
     
  6. JeremyErwin

    JeremyErwin Producer

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    ALthough you can find 1280x768 monitors out there, fairly cheaply (the WXGA standard), they aren't optimal for 720p sources-- the 720 bit gets stretched out to fill 768, and gets a bit blurry. Works in a pinch, though, if you can find non-hdcp sources. On a computer, black bars can be inserted, which helps somewhat.
     
  7. Ken Chan

    Ken Chan Producer

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    Both HD sizes, 1920x1080 and 1280x720 are square-pixel 16:9. That's the easy part.

    What I've heard regarding the TVs is that 768 is a standard panel size, which is easier for the manufacturers to make. For example, many plasma TVs are 1366x768, which is also 16:9. In that case, they always scale the picture up (720) or down (1080) -- after removing some on the edges (overscan).

    Plasmas usually aren't used as computer monitors. But for those that are, like LCDs, making the panel 768 means that it can also display 1024x768 windowboxed. Pretty much all widescreen monitors are actually 16:10 -- 1680x1050, 1920x1200, or 2560x1600. This gives you enough room for a 16:9 picture, plus some kind of bar above/below -- title, task, control, whatever.
     
  8. MarkHastings

    MarkHastings Executive Producer

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    Oh good, that's what I wanted confirmation on. I pretty much figured, but wasn't 100%.

    Thanks for the other info too, that should be enough to make sense of all of this. [​IMG]
     
  9. MarkHastings

    MarkHastings Executive Producer

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    I got it now. They went with the compromise between HD video res (1280x720) and computer res (1024x768) - it's like a hybrid monitor in that way.
     

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