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    • 8. 发明专利
    • Image forming apparatus and the tone control method
    • JP4006236B2
    • 2007-11-14
    • JP2002030057
    • 2002-02-06
    • キヤノン株式会社
    • 一生 鈴木
    • B41J29/46G03G15/00B41J2/52G03G15/01H04N1/29H04N1/407
    • PROBLEM TO BE SOLVED: To realize excellent gradation control regardless of the number of the levels of input signals in an image forming apparatus, its gradation control method and a printing system. SOLUTION: The image forming apparatus is equipped with a photoreceptor drum 1 on which a latent image corresponding to an image signal is formed, an image transfer body to which a visible image based on the latent image is transferred, a density detection sensor 13 for detecting the density of the visible image, a conversion means for forming a γ conversion table by reading a plurality of patch patterns formed in different density by the sensor 13, and a control means for controlling the gradation of an output image by using the γ conversion table. The apparatus is equipped with a reference density forming means for forming the patch pattern in the specified density being reference on the image transfer body and a comparison means for comparing the density of the patch pattern read by the sensor 13 with the reference density. Then, the γ conversion table is formed so that image density characteristic is different from the signal level of the γ characteristic of the reference according to the result of comparison, and the gradation control is performed by using the γ conversion table. COPYRIGHT: (C)2003,JPO