| 摘要 |
PROBLEM TO BE SOLVED: To provide an image processor and an image forming method, with which the original color image data (R, G and B) in the same color are expressed with the same color tone by using the combination of fixed pallets (the grid points of R, the grid points of G and the grid points of B) of the same number at all times when applying degradation processing to image data while using an error diffusion method. SOLUTION: A diffusion error 302 or the like is added from the periphery to original image data 301 or the like for 0 to 255 pieces for each of RGB channels by an adder 306 or the like and compared with a threshold by a comparator 303 or the like and an output value 304 or the like and a generation error 305 or the like are provided. Since the threshold for each of RGB channels to be used at such a time is found from the absorption rate of 60% of each of inks, for example, the threshold becomes different for each of inks. As a result, since the degradation processing result is different for each of RGB channels, the combination of pallets for expressing a certain color becomes the most at all times and the combination of fixed pallets for expressing one color can be fixed at all times. |
