Patent ID: 7538791

Claim:
A device ( 200 ) for measuring a white chromaticity of a color monitor ( 100 ), having a function of displaying color images using the three primary colors of R, G, and B, the white chromaticity measuring device for color monitor comprising: a tone value storage means ( 220 ), storing a combination of tone values of the three primary colors R, G, and B; a test pattern display means ( 210 ), displaying a test pattern (T) on a screen of a color monitor based on the tone values of the three primary colors R, G, and B that are stored in the tone value storage means; a tone value varying means ( 240 ), performing a varying operation of varying, with time and in accordance with prescribed rules that are determined in advance, the tone values stored in the tone value storage means; a comparison result entering means ( 230 ), inputting, from an operator viewing the test pattern displayed on the screen of the color monitor in a state in which the varying operation by the tone value varying means is being performed, a comparison result, for which a color of a “reference body indicating white that serves as a reference” (Q) that is positioned near the test pattern and a color of the test pattern are the objects of comparison; and a measurement result output means ( 250 ), outputting, as a measurement result indicating the white chromaticity of the color monitor under a present illumination environment and based on the reference body, the combination of the tone values of the three primary colors R, G, and B that are stored in the tone value storage means at a point at which a comparison result, indicating that the objects of comparison are matched, is input into the comparison result entering means.