example

Here is an example of what you can find over in the "in the know" section of the blog.  In this example I darkened the background to in effect lighten the foreground or the subjects of the photo. 

Here is the before...

Here is the after....

To see exactly how to do this jump on over to the fun stuff section and select in the know.  Once the new page has loaded search the topic "photoshop" and you should find it.  Have fun!