Patent ID: 7581841

Claim:
A luminance correcting apparatus for correcting the luminance of an image projected onto a screen by a projecting apparatus based on the luminance of reflected light from image light projected onto the screen by the projecting apparatus, comprising: detecting means for detecting luminance of reflected lights of projected lights individually in red, green, blue and one other color having a center wavelength that is different from a center wavelength of red, green and blue; first memory means for storing information representing luminances of the reflected lights in the respective colors which are detected by said detecting means; second memory means for storing information representing predetermined reference luminances of the reflected lights in the respective colors; luminance correcting data generating means for generating luminance correcting data by comparing the information stored in said first memory means and the information stored in said second memory means; and correcting means for correcting an image signal input to said projecting apparatus based on said luminance correcting data to increase color reproducibility.