Resolution/Frame dimension

Since iMovie's frame has a dimension of 640 x 480 does it matter that my images are much larger (in resolution not proportionally) when I import them? Ie., 960 x 720 or 1280 x 960? How does this affect playback if at all or should I crop all my images to 640 x 480 at 72dpi?

Yes, if your image is larger, then iMovie have to scale it. iMovie may do a bad job scaling.
Yes, for NTSC, you should create your images at 640x480 pixels, unless you want to use Ken Burns.
The dpi value is not relevant for video (just for scanning/printing).

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