1. A method comprising: dividing an electronic document page into a plurality of cells, the electronic document page including one or more objects, the objects including one or more transparent objects, each cell having an associated cell complexity; for each object: first identifying cells that are overlapped by the object; and increasing the associated cell complexity for each of the first identified cells; and for a subregion of the electronic document page: second identifying cells in the subregion; obtaining the cell complexities associated with the second identified cells; and combining all cell complexities associated with all second identified cells to determine a complexity for the subregion.