What PowerPoint version are you using?
In PowerPoint 2002/XP and above, you can add Emphasis (Grow) effect. To do
so, click Slide Show > Custom Animation. Select the word, click Add effect >
Emphasis > Grow/Shrink. Set the size to about more than 100%. Set the speed
to slow so that it enlarge slowly.
You will need to enable Hardware graphics acceleration. Without hardware
graphcis accleration, the word will become jaggy when enlarged. To enable it,
click Slide Show > Set Up Show. Put a checkmark on Use Hardware graphics
acceleration. Click Ok.
Alternately, if you prefer not to use hardware graphics acceleration (which
only applies to the current PC you are on), here's the workaround:
"Retain image quality when Emphasis: Grow"
http://pptheaven.mvps.org/tutorials/ImageEnlarge.html
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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: Nov 15, 2006
Added PowerPoint 2007 Visual Tour (OfficeArt Effects)
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate