Patent ID: 8675961

Claim:
A projector comprising: a correction unit correcting an input image signal based on a three-dimensional color space having apexes of respective reference colors, a black color and a white color, the respective reference colors including plural reference colors of an RGB and CMY system in the three-dimensional color space; a projection unit projecting an image based on the input image signal corrected by the correction unit; and an update unit updating the three-dimensional color space by: converting a first apex of the apexes of the respective reference colors into an HSV color space in accordance with a predetermined rotation matrix, adjusting at least one of a hue, chroma, and brightness of the first apex in the HSV color space according to adjustment information of the first apex to obtain an adjusted first apex, converting the adjusted first apex to the three-dimensional color space in accordance with an inverse matrix of the predetermined rotation matix, and replacing the first apex with the adjusted first apex; wherein: when the first apex corresponds to a CMY reference color and the adjustment information indicates the brightness of the first apex is to be adjusted, the update unit adjusts the brightness of the first apex by smaller increments as compared to when the first apex corresponds to a RGB reference color, and the correction unit corrects the input image signal based on an updated color space from the update unit, the input image signal being input after the update unit updates the color space.