Figure 1

(Right) The 1976 CIE u’v’ color diagram used by the Cambridge Colour Test. (Left) An image of the stimulus provided by the CCT showing the isoluminant noise and letter C (left). The gray area indicates all of the colors seen by the human visual system, and the white triangle indicates all of the colors used by the monitor for this luminance level. The P, D, and T lines correspond to the protan, deutan, and tritan confusion axes tested in the Trivector protocol.