| 摘要 |
The present invention accurately measures both colorimetric values and photometric values even if a luminous efficiency function does not approximate a portion of a color-matching function. In a direct-stimulus-value-reading-type colorimetric photometer, a first colorimetric optical system, second colorimetric optical system, and third colorimetric optical system have spectral responsivities respectively approximating a first part, second part, and third part of a color-matching function. A derivation unit derives, from three signals, a colorimetric value for when the color-matching function is selected as a colorimetric evaluation function and a photometric value for when the luminous efficiency function is selected as a photometric evaluation function. The luminous efficiency function does not correspond to the first part, second part, or third part. A fourth colorimetric optical system may have a spectral responsivity approximating the luminous efficiency function, and the derivation unit may derive, from four signals, the colorimetric value for when the color-matching function is selected as a colorimetric evaluation function and the photometric value for when the luminous efficiency function is selected as a photometric evaluation function. |
