Basically, the service will match paint chips to online photos–presumably even those uploaded by you (and publicly visible) on a service such as Flickr. You can even sign in with Facebook, if you’d like.
Naturally, I went and tested the out using two recent images shared here at RedWhiteandGrew.com. Then I made quick screenshots to show you the results. (Not sure why the second one is a little blurry, but you can see the color.)
Check ‘em out!