White background in post production

[edgivs]

Joel
put the subject close to the edge (foreground), then aim an external flash to the background only. Use your camera flash as "fill light" to light the subject.

 

[Mully]

You should be able to do this with one light source .... the subject is small. You do not want to try to light the background and the subject separately, if you are going to shoot products keep it simple and you will be able to repeat your set-up over again with ease.