Progressive Scan

Discussion in 'Archived Threads 2001-2004' started by Jack_F, Aug 21, 2002.

  1. Jack_F

    Jack_F Stunt Coordinator

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    Can someone offer an explanation of what "progressive scan" exactly means.

    As I understand it, progressive scan sends the signal every cycle, while passive(?) scan sends it every other cycle.

    Am I close or totally off base here?

    Thanks,
    Jack
     
  2. Andrew_Sch

    Andrew_Sch Cinematographer

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    I believe the term you're looking for as the "opposite" to progressive as interlaced. Unfortunately, besides the terms themselves, I'm as clueless as you on this subject, so I'll be awaiting the answer of someone more knowledgable than myself.:b
    Oh yeah, I almost forgot: Welcome to the HTF.[​IMG]
     
  3. Michael Reuben

    Michael Reuben Studio Mogul

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    NTSC video displays 30 frames per second. Each frame consists of 525 lines (of which only 480 are visible). Interlaced video traces every other line (or half a frame) every 60th of second. Progresssive scan traces the entire frame every 60th of a second, which results in a smoother image.
    Where this becomes critical is in video derived from film, because film runs at 24 frames per second and converting it to video requires something called the "3-2 pulldown". For a detailed explanation, with helpful diagrams, and further discussion of what progressive scan players do, look at the following link:
    http://www.dvdfile.com/news/special_...2_pulldown.htm
    M.
     

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