| 摘要 |
PROBLEM TO BE SOLVED: To perform reproduction of an image or data transfer from a host computer to a color laser printer. SOLUTION: Halftone processing is performed in two stages. In the first stage, the first halftone data consisting of the pulse width pertaining to each picture element are generated (step S15), based on the gradation of the picture element of image data, using a gradation-to-pulse width table where pulse width to the gradation of the picture element of the image data are written as to a pattern matrix and each reference No. in the pattern matrix. In the second stage, the pulse position information pertaining to each pulse width is generated (step S18), based on the first halftone data, using the pulse width-to-pulse position table where the pulse position to each pulse width value is written, as to the same pattern matrix as was used in the first stage and each reference No. in the pattern matrix.
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