This edited stock photograph is more effective and professional. In this title slide, the image is primary. Transparent border In this slide from the same presentation, the image is secondary and pushed to the back by editing it first in Photoshop.
Note and point: http://noteandpoint.com/category/keynote/ Flickr: http://www.flickr.com/photos/photographygal123/with/4885798964/#photo_4885798964
Create white border for the picture
Use a Big picture
5 PowerPoint Design Principles Keep it simple Limit bullet points and transitions Use color and fonts well Use high quality graphics Use audio or video