1. A method comprising: providing a display area for displaying an image that comprises a plurality of edges; and providing a border drawing tool that in response to movement of a location indicator across the image displays a search window about the location indicator, the search window specifying a region to search for edges in the image along which to define a border for display over the image, wherein a size of the search window varies based on a speed of the location indicator, wherein when the border drawing tool identifies a plurality of edges within the search window for a particular location, the tool defines the border along an edge closest to the center of the search window.