You can use the Quick Selection tool in Photoshop to easily select and edit specific parts of a photo. Once you've made your selection, you can delete or edit that section without affecting the rest ...

Photoshop CS5 Tutorial showing how to use the Refine Edge, the Refine Radius tool, Edge Detection & the quick selection tool!

You can use the Magic Wand tool in Photoshop to automatically select a specific section of the image. The Magic Wand uses colors to decide what should be selected, and you can change its "Tolerance" ...