This option is used when tiling images with an overlap. This mark shows where the overlap begins and ends to help you combine tiles easily. When piecing the tiles together, the [Tile Dotted Overlap] mark of one tile overlays the corresponding mark on the adjacent tile.
To use [Tile Dotted Overlap] marks, enable this box. Please note you must first enable Registration of the [Edge Marks] going to Job Editor > Finishing tab > Mark tab in or [Marks] of the Finishing tree in the Advanced Quick Sets.