I realise that my comment above wasn't as clear as it could have been. It doesn't need to be a white background. It just needs to be a background of the same colour for the tool to work most effectively. You select the colour you want to remove when you open the tool from the menu (white is the default, I believe).

When you have a single colour background, it's literally a one-click solution to remove it, so it's super easy to use. Hope it works for you. Any probs, just holler.