If you like to take photos of coral, fish, and fauna, this will interest you.
It’s a video from the folks at MacWorld, simple-but-cheap advice about how to take photos underwater and then what to do with them to make them look better.
Although it shows post processing your pictures using iPhoto, other editing software like Photoshop Elements and Picasa can help you do the same things.
Click to see the video: http://media.macworld.com/media/vodcast/mwvodcast66.mp4 (Be patient, it’s a QuickTime movie and needs to download.)
I have been using the underwater settings and underwater encloseure with my Canon A540 for a couple of years now. The underwater setting really makes a big difference as it filters out the excess blue in the image. Take a look at one of my St. John underwater videos at:
http://www.travelistic.com/video/show/2959/Diving-Haulover-Bay-North-on-St.-John's-East-End