Abstract: A graphics display image is displayed on a display, the graphics display image being formed by a plurality of graphics display image components, at least some of which have to be edited. The graphics display image components may be generated from data obtained e.g. from optical reading of a hard-copy of a map, circuit diagram, or design drawing by a suitable optical reader. The graphics display image components which are to be edited are displayed with a different visual appearance from any components which do not have to be edited, e.g. by highlighting the components to be edited. As the editing of each components is completed, its visual appearance is changed, e.g. the highlighting cancelled, so the operator has an immediate visual indication of the components which have not yet been edited. In this way, complete editing can be ensured.