mask_setup [value set, value displayed] [set radius, display radius] [contour radius] [contour colour]
Setting a pixel point on, associates the value 1 with that point. This command allows the user to decide if the mask is to be shaved, or expanded. When the mask is being edited, it appears as a grid of dots. These dots can either represent mask on or off, depending on what the user defines in Mask_setup. Radii are used to control the volume in which editing takes place, the volume to be displayed as dots, and the radius within which the mask can be contoured with Mask_contour. The contoured mask can of course have a user definable colour.