Hi

In master view double click the picture to open the format picture dialogue
box. On the picture tab change 'picture' from automatic to washout. This may
or may not work depending on your picture :-). If you don't like that result,
undo, draw a rectangle over the entire slide (rectangle shape will be on your
drawing toolbar, probably down the bottom of your screen. If you can't see
the drawing toolbar, view -> toolbars -> tick drawing), double click it to
open format shape dialogue, on the colours and lines tab play with fill
colour & transparency.

Hope that makes :-) Post back if not.

Lucy