Patent ID: 8274695

Claim:
An image processing apparatus that generates print data based on image data included in a print job for a driving recording head that can eject ink droplets with a plurality of colors including black, and that can eject a treatment liquid corresponding to the ink droplets for aggregating color materials in the ink droplets, the apparatus comprising: a determining unit that determines whether an image is to be recorded by one of ejecting the treatment liquid based on the print job and ejecting the treatment liquid when the image is to be formed on both sides of a recording medium; a generating unit that generates print data by converting portions of each of the color data that are capable of being replaced by using black ink droplets into black data at a predetermined ratio based on the image data; the generating unit generating the print data using one of two or more color conversion tables, the ratios of which are different from each other; and a ratio setting unit that sets the ratio of the generating unit when the determining unit determines that the image is to be recorded by ejecting the treatment liquid so that the ratio is higher than that in other cases; the ratio setting unit selecting the color conversion table according to the result determined by the determining unit.