between 72 and 150 ppi final image size is fine, depending on your final use.

There is a presentation on Preparing PPT files from Last year's GNSI
meeting  here:
http://www.gnsi.science-art.com/2003CO/meeting.html

>Hi everyone,
>
>I am putting together a series of PowerPoint slides to accompany a
>talk I'm giving. I've never done this before, and I am wondering as
>I scan images if there is an ideal dpi and format (jpeg, tiff...)
>that maximizes the sharpness of the image when projected. So far I'm
>doing 150 dpi, high quality (low compression) jpegs. A friend is
>going to let me use a projector to try them out, but I thought the
>wisdom of the list might save me lots of trial and error! Also, I
>want to use some images off the web.  Is there any chance they will
>be sharp enough to project?
>
>Thanks,
>
>Hannah
>--
>Hannah Bonner
>Calle Caro 21, 5,1
>07013 Palma de Mallorca
>Spain
>Home   34-971-450034
>Studio 34-971-724813
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