| 摘要 |
PROBLEM TO BE SOLVED: To reduce an operation time by alleviating a condition necessary for a memory in terms of a method and a printer wherein a gray scale gradation is approximated using an image forming apparatus in a more limited range. SOLUTION: This printer executes rendering of an object represented by a page description language in scanning of an image forming apparatus (401) and determines based on the rendering an image region having the object subjected to the rendering. At that time, bounding boxes 403, 405 that surround all of the objects subjected to the rendering are determined, then the image region is determined. Input pixels in the image region are subjected to screening (407), but ones outside thereof are not. Thus, the necessary or unnecessary of the screening is discriminated so that a time period required for the screening can be reduced and each row of preference matrix is divided into segments so that use of a memory is improved.
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