Depends on what your deliveralble is:
(Render out at 72 dpi)

Standard Def: DVD: (4:3)   720x480
DV Widescreen (16:9) 720x480 aniamorphic

 NTSC D1: (4:3) 720 x 486
 NTSC D1: (16:9) 720 x 486 anamorphic

HD:
HDV/HDTV 720 (16:9) 1280x720
HDTV 1080 (16:9) 1920x1080

Film:
2K (512:389) 2048x1556
4K (512:389) 4096x3112

There are a lot more variations, not to mention PAL

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