15 Replies Latest reply on Dec 13, 2011 12:36 PM by Jim_Simon

    720x480 -- SD and Widescreen not 4:3 or 16:9

    Sengstack Level 1

      Hi,

       

      This is one of those topics that I've not seen answered definitively.

       

      NTSC DV is 720x480 square pixels.

       

      If it's NTSC SD, the final display is 640x480 -- a 4:3 "frame" or screen aspect ratio. The pixels are squished (taller than wide) such that the pixel aspect ratio is .9091. But if you multiply 720 by .9091 you get 654.552. What happens to those extra 14.552 pixels?

       

      If it's NTSC widescreen, the final display is 853.333x480 -- a 16:9 "frame" or screen aspect ratio. In this case the pixels are stretched (wider than tall) such that the pixel aspect ratio is 1.2121. But if you multiply 720 by 1.2121 you get 872.712. What happens to those extra 19.37867 pixels?

       

      Thanks to whomever clears this up or points me to a definitive answer.

       

      Jeff S