A method for normalizing a value indicating an equivalent lightness of a given color and a value indicating a vividness, a tone type determining method, a Munsell value calculating method, an image forming method, and an interface screen display device

摘要

A technique for calculating a psychophysical quantity of a color corresponding to an arbitrary tone by modeling a tone concept defined in PCCS (Practical Color Co-ordinate System). A method for generating a definition formula for each of the saturations to which each tone belongs for a plurality of types of tones defined in PCCS, wherein a computer is the same among a plurality of types of tones defined in PCCS The Munsell values of the colors belonging to each of the plurality of tones belonging to the saturation of the image are acquired, the computer stores the acquired plurality of Munsell values in a predetermined storage device, and the computer stores the plurality of Munsell stored in the storage device Each value is converted into a value on a predetermined color space composed of two axes of a value indicating brightness and a value indicating vividness, and the computer performs a predetermined regression on the point group projected on the predetermined color space. An arithmetic operation is performed to obtain a regression equation passing through the origin on the predetermined color space. [Selection] Figure 2