Motion 5 - Working with Standard-Definition (SD) Video Displays

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Working with Standard-Definition (SD) Video Displays

Standard-definition (SD) video displays differ from computer displays in a significant way
(aside from interlacing): computer displays represent images using a grid of square pixels,
while SD video displays use rectangular pixels.

720 x 486 Broadcast

(720 x 480 DV)

640 x 480


Appendix B

Video and File Formats

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SD NTSC pixels are narrower than computer pixels and SD PAL pixels are wider than
computer pixels. As a result, a 720 x 486 pixel image looks different on a computer display
than it does on a video monitor. For example, if you capture a clip of video with a globe
in the picture, export a frame, and look at this frame in a graphics application, you’ll see
something like this:

Looks right

on a video monitor

NTSC square vs. nonsquare pixels example

Looks wrong

on a computer monitor

To display nonsquare pixel video correctly in Motion, choose Correct For Aspect Ratio in
the View pop-up menu above the Canvas.

Note: Because full-raster high-definition video uses only square pixels, its images always
appear correctly when displayed on SD video displays.