Help for CONFILL

      CONFILL is a VICAR program that fills by interpolation an image of
 contour lines.  The input image must consist of contour lines, each of whose
 DN is equal to the value of the contour.  The background pixels must all have
 a single DN value.  Interpolation is performed in the horizontal direction,
 and the user may choose either a linear or cubic spline interpolation.  The
 values of the outermost contours are extended to the edges of the image.
 ORIGINAL PROGRAMMER:  Ron Alley    6 March 1992
 
 CURRENT COGNIZANT PROGRAMMER: Ron Alley