How to add this shadow border

[igloopants]

How do I add that type of shadowed border?

Even if someone can tell me what it's properly called so I can find a tutorial?

 

[reznap]

It's called a vignette. There's free actions and plugins for photoshop which do it very well.

Also, burned edges is another name with a slightly different look (less corners, more edges).

 

[igloopants]

Ah, thanks!