8. The method of claim 7 in which each location's data item indicates whether the location has a first color or a second color, the substep of applying the criterion further comprising a substep of determining whether the location's data item indicates that the location has the first color.
8. The method of claim 7 in which each location's data item indicates whether the location has a first color or a second color, the substep of applying the criterion further comprising a substep of determining whether the location's data item indicates that the location has the first color. 9. The method of claim 8 in which each of the second number of locations has two or more neighboring locations in the image, the substep of applying the criterion further comprising substeps of: accessing the respective data items of the location's neighboring locations; and determining whether the respective data item of any of the neighboring locations indicates that the neighboring location has the second color so that the location is at an edge between the first color and the second color.