You
            can wipe the result image when you want to apply a uniform colour
            at the current frame in a single brush stroke. Alternatively, you can
            use a source, to wipe over an image.
         
         To wipe the result image with a colour
            or a source:
         
         
            - From the View box, select Result (F4).
            
- Do one of the following:
               
                  - Pick the wipe colour by clicking the
                     colour pot to the right of the Wipe button. See 
                                    Colour Picker.
- Select the source in the Sources list
                     and enable Use Source.
                  
 
- To display the source as an overlay of
               the result image, enable Overlay (Tab).
               You can apply transformations to the source before you apply the
               wipe:
               
            
- Click Wipe.