High Pass is special good for noise images.
But with Smart Sharpen we can have more control.
The secret is apply a bit more strong sharpen value and then
fade(SHIFT+CTRL+F) in luminosity mode!
Video tutorial:
Code:
http://www.photoshopsupport.com/tutorials/tt-cs2/smart-sharpen-tutorial.html
Some toughts
Code:
http://www.popphoto.com/howto/2200/inside-photoshop-using-cs2s-smart-sharpen-filter.html?print_page=y
If the image is noisy you may go this way or the High Pass way...
Code:
http://www.luminous-landscape.com/tutorials/smart_sharp.shtml