You can edit a mask after it has been applied:
- To add to the mask, place the mouse cursor in the baseline bitmap window at the position where you want to begin adding to
the mask. Click and drag the mouse cursor to outline a rectangle. Then release the left mouse button.
- To delete part of the mask, place the mouse cursor in the baseline bitmap window at the position where you want to begin
deleting part of the mask. While pressing and holding the
Shift key, drag the mouse cursor over the area of the existing map that you want to delete, and then release the
Shift key and the left mouse button.