All digital images require sharpening - even if shot on a state of the art digital SLR in focus. Most cameras can sharpen in camera but the highest quality sharpening is achieved in post-production. Elements will allow you to select the amount and the areas that require sharpening most. For images destined for print the monitor preview is just that - a preview. The actual amount of sharpening required for optimum image quality is usually a little more than looks comfortable on screen - especially when using a TFT monitor (flat panel).
The basic concept ...