HD Formats

Discussion in 'Beginners, General Questions' started by andy_brehm, Nov 17, 2003.

  1. andy_brehm

    andy_brehm Stunt Coordinator

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    i have a bit of an idea of what the HD formats are but i was wondering where i could read up to understand exactly what 1080i 720p etc are and what their sources are.

    thanks
     
  2. Rob Ritch

    Rob Ritch Agent

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    Basically the number indicates the the number or horizontal lines or resoltuion ie 480 720 960 an 1080. Then there is the i or p, these indication interlaced or progressive. With interlaced, the display "paints every other line going down the screen and then fill in the remaining lines coming back up. With progressive, the display paints evey line as it goes down. Hope this helps.
     
  3. ChrisWiggles

    ChrisWiggles Producer

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    I'd like to clarify/correct.

    The number that denotes the scanlines is per frame of video. The P and I denote, as mentioned, progressive or interlaced, which indicates whether the number of scanlines is ALSO per *field.* A progressive display scans the entire resolution of a frame of video in each field. An interlaced display runs two fields, even and odd lines, to create one frame of video. Also, another nitpick, is that a CRT does not scan coming up. It scans one way, returns to the top, and scans again, for each field in an interlaced picture. It does this twice, once for both even and odd sets of scanlines, in two fields, to create the one frame of video. Progressive does this all at once, going the same direction, every line after the previous one.

    Here is also a good link:

    http://members.aol.com/ajaynejr/vidhdtv.htm
     
  4. ChrisWiggles

    ChrisWiggles Producer

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    I'll also link you here:

    http://www.digitaltelevision.com/consumer/index.shtml

    Theres lots of info there, and in that list, pay particular attention to "consumer basics" parts 1-3.

    Also beware that those are a tad out of date, but the technical info should still be solid.
     
  5. ChrisWiggles

    ChrisWiggles Producer

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  6. WayneG

    WayneG Stunt Coordinator

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    Last night a rep. from my cable company (Rogers) was on TV. A caller asked him about HDTV. He explained that regular TV was 300 lines of resolution, DVDs 525 lines, and HDTV 480 to 1080 lines. I found those numbers unusual because I understood that TV and DVDs were 480 and HD 720p or 1080i. I wonder how he came up with those numbers.
     
  7. Lew Crippen

    Lew Crippen Executive Producer

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  8. ChrisWiggles

    ChrisWiggles Producer

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    because 480 actually is more than that, hence the 525. He was incorrect with the hi-def that's 720p and up, usually 720p/1080i. I gotta run but im sure someone can explain the 480 to 525 number better.
     

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