Color characteristic measurement apparatus, color characteristic measurement method, and picked up image data storage medium

A picked up image data storage medium for adding to image data provided by an image pickup machine a gradation characteristic and a spectral sensitivity characteristic of the image pickup machine or data provided by performing operation on the gradation and spectral sensitivity characteristics and storing the image data.

A picked up image data storage medium for adding to image data provided by an image pickup machine having n color channels (n is a natural number), n+1 types of characteristics consisting of spectral sensitivity characteristics of the image pickup machine and a spectral distribution characteristic of an illumination light source at photograph taking time, n types of characteristics provided by multiplying the spectral sensitivity characteristics of the image pickup machine by the spectral distribution characteristic of the illumination light source for each wavelength, or data provided by performing operation on the characteristics and storing the image data.

A picked up image data storage medium for adding a multiplication factor for making a y coefficient representing a gradation characteristic of an image pickup machine equal to a γ coefficient of an image output unit to image data of the image pickup machine and storing the image data.

A picked up image data storage medium for adding to image data of the image pickup machine, coefficients of a matrix with three rows and three columns for making output signals Rc, Gc, and Bc of the image pickup machine provided by integrating products of ρ(λ), L(λ), and R(λ), ρ(λ), L(λ), and G(λ), and ρ(λ), L(λ), and B(λ) in all wavelengths equal to the signals Rs, Gs, and Bs through the matrix with three rows and three columns and storing the image data, when signals provided when a color chart with spectral distribution characteristic λ(λ) is imaged by an image pickup machine fitted to a color space of an image output unit under illumination of reference white stipulated on the color space are Rs, Gs, and Bs, in an image picked up by image pickup machine with spectral distribution characteristic R(λ), G(λ), B(λ) and an image file storing data of the image, when the color chart is imaged under illumination with spectral distribution characteristic L(λ).