One of the questions I get asked a lot in classes and workshops is how to achieve a pure white background without a lot of Photoshop knockout. Well, the short answer is to simply light your background about one stop brighter than your subject. In this case, my background is  a 9 foot wide roll of white Savage 107X12-1 Seamless Background Paper - Super White. . For the floor, I've used white tile board from The Home Depot which…