Patent ID: 7460269
Filing Date: 2008-12-02
Classification: H04N

Abstract:
1. A method of generating color data for image formation in a color image forming device by converting data of color values for three colors of cyan, magenta, and yellow, representing a color image to be formed, into data of color values for four colors of cyan, magenta, yellow, and black, the method comprising: preparing a plurality of black data generating tables which have different black data conversion characteristics from one another; receiving a set of color data including color values for three colors of cyan, magenta, and yellow; extracting a minimum value among the three color values in the received set of color data; selecting only one black data generating table dependently on color of the extracted minimum value irrespective of whether the three color values in the received set of color data are different from one another; and generating a value for black using the selected black data generating table and based on the extracted minimum value.