PowerPoint has very limited picture editing capabilities. Your best bet
is to use a program designed for editing pictures. Also, you need to be
careful about your confidentiality constraints. If you are removing the
birthdates to protect confidentiality, just about anything PowerPoint can
do will not be good enough for the electronic file. In PowerPoint you can
use the cropping tool, or you can cover up the birthdates with a box.
These things would not show the birthdates when printed, but anyone with
access to the electronic file could uncrop or move the box (unless you
export the slide as a picture).
I remember a case a few years ago where some government agency had posted
files to the Internet with certain confidential information blacked out.
Unfortunately, the black boxes could easily be removed revealing the
names that were supposed to be hidden. This wasn't in PowerPoint, but the
same priniciple applies.
--David
--
David M. Marcovitz
Microsoft PowerPoint MVP
Director of Graduate Programs in Educational Technology
Loyola College in Maryland
Author of _Powerful PowerPoint for Educators_
http://www.PowerfulPowerPoint.com/