| 摘要 |
PROBLEM TO BE SOLVED: To conduct proper limit processing by limiting output image data based on the amount of a recording material on which an image is formed, allowing a gradation correction device to conduct gradation correction in response to the resolution and limiting the data amount to an amount in response to the resolution based on the image forming enable recording medium amount. SOLUTION: A UCR black generating section 40, a gamma correction section 50, and a binarization processing section 60 in the image processing unit 100 conduct processing. Each processing section is limited based on control of a CPU 71. At first image data of 1001-1003 multi-value level of yellow Y, magenta M and cyan C are received. A minimum value min CMY 1004 in the Y, M, C multi-value data is obtained. Then the processing to generate a black multi- value level K1006 is generated by the min CMY. Let a function to conduct the processing be BGFR(), then a generated black bgrCMY is expressed as grCMY=BGR(minCMY). The sum C+M+Y+K of color injection amounts is limited so as to be within twice of the maximum value of the multi-value level by UCR, BGR functions. |
