That's no problem. After you grow the image, simply fade it out and fade-in the one with high resolution.
That should be it. Separately, a nice Powerpoint plug-in tool for doing simple tweens is called Tweeny (google Tweeny Powerpoint). A great Flash authoring tool and inexpensive is called KoolMoves. Great program, great support. Some people feel its the best (also support forum).
Have Fun!
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