| 摘要 |
PROBLEM TO BE SOLVED: To provide an image processing apparatus having less amplification of a quantization noise without using a special table to obtain an output image in which the generation of a unique pattern is suppressed; and to provide an image processing method, an image processing program, and a recording medium recording the program. SOLUTION: In gradation data conversion processing (pre-gradation conversion processing: S20) to be performed before color correction processing, gradation data of an input image is converted into a level value having reduced kinds, thereby giving variation to the gradation data of the input image. Then, in gradation data conversion processing (post-gradation conversion processing: S40) by halftone processing, an unprocessed pixel is selected based on the centroid of a cell to generate a cell. At this time, error data exceeding a threshold are returned to a pixel which is lastly incorporated into the cell. COPYRIGHT: (C)2006,JPO&NCIPI
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