A method of, and apparatus for, printing information on a hardcopy medium includes
the acceptance of data representing a first information and the acceptance of data
representing a second information. Second information is printed in regions on
the medium where first information data is not printed. Second information data
is encoded into a grayscale or color data representation such that necessary or
maximum data density is achieved. First information is printed using black (K)
ink (or alternatively using a different color gamut than that used for printing
the second information) such that first information can be filtered out in a straightforward
manner upon scanning of the printed medium by a digital scanning apparatus, and
second information can then be recovered and utilized to advantage.