Patent ID: 6864995
Filing Date: 2005-03-08
Classification: G06K,H04N

Abstract:
1. A gradation correction curve producing method of producing a gradation correction curve for correcting a gradation of an image, said gradation correction curve producing method comprising: a patch output step of outputting a plurality of monochromatic density patches for each of monochromes, and a plurality of gray density patches for a gray in which the monochromes are combined; a measurement and colorimetry step of measuring density of the plurality of monochromatic density patches, and performing a colorimetry of the plurality of gray density patches; and a gradation correction curve computing step of determining a gradation correction curve for each monochrome for gradation correction using a first gradation correction curve for each monochrome obtained through measuring density of the plurality of monochromatic density patches, and a second gradation correction curve for each monochrome determined from colorimetry values obtained through the colorimetry of the plurality of gray density patches.