| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress production of noise and correct uneven contrast and stripes, in an image formed by an electrophotographic system. <P>SOLUTION: The degree of a primary component used for gradation conversion is properly revised to be proper by adjusting a density coefficient depending on high and low of a density area to which the density of a segment region belongs. Concretely, when the density of the segment region belongs to a predetermined low density region, the degree of the primary component used for the gradation conversion is lowered to first-order and second-order, when the density of the segment region belongs to a medium density region higher than the low density region, the degree of the primary component used for the gradation conversion is increased up to fourth-order from the first-order. Thus, the gradation conversion characteristic of each segment region can excellently be corrected and the gradation conversion can be executed by using the order of a degree not causing noise. <P>COPYRIGHT: (C)2008,JPO&INPIT |
