Click the Slide Layouts button in the Elements Gallery & take a look at the
dotted rectangles on various layouts. The rectangles that display the 6
'insert content' icons are Content Placeholders. Use a slide layout that
includes a Content Placeholder of that type & select that placeholder before
inserting the content. The incoming content will be constrained by the
placeholder. If you don't select a placeholder the content is
pasted/inserted at whatever its default dimensions happen to be.
Along the same line, it's best to process graphic content using a graphics
editing program in order to determine the resolution, pixel dimensions, etc.
before inserting them into any type of document file. This is especially for
raster images, which is what any photograph would be. Scaling raster
graphics in the document app can tender quite unacceptable results.
One further word of friendly advice
Pasting graphic content into any
type of document is one of the worst practices you can adopt. Use the
Insert> menu to insert images... Especially photos. Rely on copy/paste only
if there is no other alternative.
HTH |:>)
Bob Jones
[MVP] Office:Mac