Apparatus and method for fortification of black pigment based ink using black dye based ink

An apparatus for improving the print quality of a print job having black content, the black content having a predetermined location on a print medium, the apparatus comprising:

• a first printhead configured to fire black dye based ink droplets on the print medium;
• a second printhead configured to fire black pigment based ink droplets on the print medium;
• and
• a processing system configured to fortify the black content by controlling the first printhead to fire droplets on the predetermined location, the processing system being further configured to print the black content by controlling the second printhead to fire droplets on the predetermined location;
• wherein the processing system is further configured to determine whether the print medium is incompatible with the black pigment based ink, control the first printhead to fire droplets on the predetermined location in an essentially uniform, partial density pattern and/or in an essentially complete coverage in response to the print medium being incompatible with the black pigment based ink, and control the second printhead to omit the firing of droplets on the predetermined location in response to the print medium being incompatible with the black pigment based ink.