Is anyone able to tell me if there's a particular name for the type of effect applied to the photos on this site (it's a demo of a Wordpress theme): http://demo.mountainthemes.com/05/ . I'm referring to the layer of noise; when you zoom in you can see it's a screen of tiny black squares. Gives it a sort of modern, hi-tech look. Don't really need step-by-step instructions, just some terminology, so I could perhaps search for other themes that use the same effect.
thx!
thx!