1. A method for changing a tonal compensation parameter of a printer without resort to calorimetric measurement, said method comprising the acts: instructing the printer to print a test graphic comprised of elements that should differ slightly in tone value; receiving data based on a difference between the visual appearance of first and second of said elements, as actually printed; and by reference to said received data, changing a tonal compensation parameter of the printer; wherein said receiving data comprises receiving data from a sensor disposed within a housing of said printer.