1. A method of printing comprising: replacing each of black dots of a first subset of black dots of a halftoned bit map for a predetermined area with a process black dot; adding a non-black dot to each of black dots of a second subset of black dots of the bit-mapped data; wherein the halftoned bit map is generated by halftoning continuous tone data; wherein the black dots of the second subset comprises a percentage of all the black dots that tends to generally increase as a ratio of black coverage to total coverage in the predetermined area increases; wherein the second subset comprises black dots that are not in the first subset; and printing the bit map.