I think there are settings on your camera that may bump it up to a higher resolution when taking pictures?? I have that option on camera.
The reason I know about the high res stuff is, I used to work in a print shop, so I exactly what you need. Scott is right. Printers like to use a 300dpi resolution picture. The higher the better. If is a small picture, the resolution doesn't matter too much. It depends on the final size though.
GOOD LUCK!!
