If you have clients who bring you not-quite-right photos to fix, here is an easy-peasy Photoshop tutorial that you will find really useful.
Originally published by Digital Synopsis, this tutorial is by Unmesh Dinda. Sample images are included for download so that you can follow along. Pretty neat!
This Clever Photoshop Trick Lets You Stretch Backgrounds Without Distorting Your Subject
Happy 4th of July!