The Modify Image Registration tool is used to add or edit the control points. It lists all control points that have been assigned to the raster image. Each control point has a label, indicating the name of the control point. The label is optional; if you do not specify a label, MapInfo Pro assigns a default label, such as Pt 1.
Click the image to open the Add Control Point dialog box. Once you have entered several control points, MapInfo Pro displays an error calculation for each control point. An error value of zero indicates that the control point is placed correctly. An error value greater than zero indicates that the control point's placement seems incorrect, given the placement of the other control points. The numeric error code indicates the control point's distance, in pixels, from where MapInfo Pro calculates the control point should be placed.