                                                                mask
Chapter 11 Raster Manipulation

Similar to the corridor command, the mask command generates a perimeter of a
specified radius around all of the objects in a specified set and then fills
(turns pixels on within) the new polygonal areas.

mask

    Overlays objects in set s with solid mask of radius r.

*        mask s u r
*   ___________________________________________________________________________
*   Options/arguments:
*
*        s         Set number, where:
*                  0 - 24 are valid entries
*        u         radius units code, where:
*                  0 = pixels
*                  1 = map inches
*                  2 = ground feet
*                  3 = ground miles
*                  4 = map centimeters
*                  5 = ground meters
*                  6 = ground kilometers
*        r         Radius in pixels
*   ___________________________________________________________________________
*   Example(s):
*
*   To overlay the objects in set 12 with a solid mask with a radius if 16
*   pixels, enter:
*    
*        mask 12 0 16
    ___________________________________________________________________________
    See also:

              open_solids, corridors
    ___________________________________________________________________________
