US Patent 7287823 Ink jet printing apparatus and ink jet printing method

This invention prevents smear and boundary bleeding and allows for printing of black images such as black characters with high quality. For this purpose, an AND operation generates print Bk data by culling original Bk data. Based on the data culled by the AND operation, PCBk application data generation operation generates PCBk application data that is used to apply C, M, Y color inks capable of forming a black by color mixing. Based on the PCBk application data, C, M, Y application data 1 for applying smear prevention color inks, C, M, Y application data 2 for applying boundary bleeding prevention color inks and original C, M, Y data. print C, M, Y data are generated.