I must have missed the instructions. To which instructions are your
referring? Are you trying to get the picture to fill the whole screen? If so,
your picture will have to have a 4:3 ratio of width to height. Otherwise,
depending on which instructions you follow, the picture will either be
distorted, cut off, or not filling the screen.
Try this:
After you have whitewashed your photo and before you have adjusted its size,
place the picture on the master slide (View > Master > Slide Master). Next,
drag the picture from any corner (not the middle of a side) to maintain the
width:height ratio. Keep dragging from corners until it is as close to
filling the screen as you can get it to be. Next, go to the Draw menu, and
choose Order > Send to Back. Now close the master view, and you should have a
non-distorted (though possibly cut off or not quite full-screen) watermark.
--David
David M. Marcovitz
Microsoft PowerPoint MVP
Author of _Powerful PowerPoint for Educators_
http://www.loyola.edu/education/PowerfulPowerPoint/