Optimal resolution for importing graphics?

What is the best resolution for importing background images into keynote? I'm working on a 800 x 600 presentation and am wondering what resolution of file I can get away with using as I have quite a few full background images. Can I get away with 72 dpi?
thx.

Forget about DPI.
DPI (Dots Per Inch) is absolutely meaningless in this world. Why? Because INCHES are meaningless in this world of the screen and projector, where EVERYTHING is measured in PIXELS.
Your screen is 800 x 600 pixels. That means, for optimum image quality, your background image should be 800 x 600 pixels. If your images are larger than that (for instance, my camcorder can shoot stills that are 1600x1200 pixels) then you need to resize to fit your screen.
If you are using some brain-dead program that won't speak in pixels (Microsoft PowerPoint jumps immediately to mind, although that is a poor example because it is also supposed to be dealing with the screen...) then you need to do some conversions. If you have a 72 DPI image that is 4 x 3 inches, then that image will have a resolution of (72x4) x (72x3) = 288 x 216 pixels.
--Dave Althoff, Jr.

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I have some confusion as far as the proper resolution for graphics...
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4:3 is not 720x480 yet a 4:3 DV video is 720x480.. so I am confused.
Welcome to the world of rectangular pixels. To further complicate the matter, for historical reasons there is some "extra room" around the actual video frame. That is a mess that produces all kinds of errors when people try to calculate the aspect ratios!
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http://www.sjoki.uta.fi/~shmhav/SVCDon_a_Macintosh.html#aspectratios
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http://www.iki.fi/znark/video/conversion/

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Optimal resolution for importing graphics?

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