In Direct Mode it is possible to make manual corrections on the grains / intercepts binary overlay image. Once the measurement starts, the corresponding buttons tied with the selected method appear on the left toolbar:
Separate Grains 
Figure 1441.
Manually drawn curve separates two grains. It must have two intersections with the grain boundary – one intersection is ignored.
Connect Grains 
Figure 1442.
Manually drawn curve connects all the grains the line goes through or touches.
Smart Delete Grain 
Figure 1443.
Left click on the grain connects the touched grain to the best neighbour using internal algorithm.
Delete Grain 
Figure 1444.
Left click on the grain connects the touched grain to the best neighbour using internal algorithm.