Patent ID: 8514396

Claim:
A color measuring device comprising: a storage unit configured to store therein colorimetric values corresponding respectively to a plurality of colors constituting a reference chart in a predetermined color space that is device-independent; an image capturing unit configured to capture the reference chart and a subject to be a target for color measurement simultaneously to acquire RGB values of the reference chart and RGB values of the subject; a search unit configured to search for at least RGB values of four points corresponding to vertices of a polyhedron in the reference chart, the polyhedron including a specified RGB value of the subject in an RGB color space; a calculating unit configured to calculate a linear transformation matrix for converting the RGB values of the four points in the reference chart into the colorimetric values corresponding to the RGB values of the four points stored in the storage unit; and a conversion unit configured to convert the specified RGB value of the subject into a colorimetric value corresponding to the specified RGB value of the subject in the predetermined color space based on the linear transformation matrix.