second actuator can be described as a twisting of the adjusted tone reproduction curve achieved by the first actuator an exemplary embodiment of a method of employing a second actuator will now be described in various exemplary embodiments an algorithm is employed that measures three tone reproduction curve levels in various exemplary embodiments the three measured levels correspond to 20 50 and 75 in various exemplary embodiments an algorithm is employed that calculates the sum of the three measured tone reproduction curve profiles step s 610 in fig6 thus these exemplary embodiments obtain an average profile weighted by a factor of 3 in various exemplary embodiments a difference profile u03b4d is calculated for the average profile in various exemplary embodiments the difference profile is calculated by subtracting reference patch density from all other patch values step s 620 in fig6 in various exemplary embodiments patch values correspond to discrete steps in the profile such as the exemplary profiles depicted in fig1 and 2 in various exemplary embodiments the patch values are obtained from patches that are uniformly spaced across a page thus corresponding to position on the page in various exemplary embodiments the reference patch density is arbitrarily selected in various exemplary embodiments the reference patch density corresponds to a predetermined color intensity such as the reference points referred to above at arbitrary unit 15 in fig1 and 2.