PROBLEM TO BE SOLVED: To provide a color measuring technique, a color measuring device, and a gauge for directly reading tristimulus value, capable of implementing high precision measurement easily independently of spectral shape.;SOLUTION: The color measuring technique using a gauge for directly reading tristimulus value includes: the measured value acquisition process S21 of measuring a measuring object with the gauge for directly reading tristimulus value to acquire measured value in response to spectral responsiveness based on spectral transmission characteristics of an optical filter and spectral sensitivity characteristic of a light receiving element; the optimal single wavelength retrieval process S22 of retrieving a triangle of the minimum area which contains measured chromaticity computed from the measured value among triangles having the three points representing single wavelengths different each other as an apex in a gauge color coordinate for each single wavelength in which spectral responsiveness is converted; and the correction value computing process S23 of computing the matrix correction value correcting the measured value from a relation between spectral responsiveness and color-matching function at each single wavelength of the three points as the apex of the triangle.;COPYRIGHT: (C)2009,JPO&INPIT
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