Photoshop offers a wealth of tools for cropping images. You can crop to an aspect ratio, use content-aware fill and many other techniques.

A new episode and lesson of Shooting Cars! This is an editing walk through of how to clean or detail a dirty car in photoshop ...

It only takes a few steps to change your image's background color in Photoshop. You'll just need to use the Quick Selection Tool and Quick Mask mode.