slides with images - screen vs. print?!

S

Sal

I've created some images in Photoshop

have found that png and gif work past as inserted images on powerpoint

my powepoint slide has a gif image as a background

some images are cutout (mostly elipical in shape) and have a "feathered"
border

Only the png's insert well in powerpoint - the gif's have a "hard" edge --
although the png's look ok on the pc monitor / projector - they develop the
same hard edge as the gif image slides when printed.

why the problem when printing?
 
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