1. A picture quality analyzer having a display according to the method of displaying a color error map between a reference full color video signal and an impaired full color video signal produced by a picture quality analyzer comprising the steps of: calculating a difference value between an impaired value and a reference value for each pixel of a frame of each full color video having a luminance component and chrominance components obtained from the reference full color video signal and the impaired full color video signal, for each chrominance component adding the difference values to a pedestal; adding sufficient luminance as a function of the chrominance difference values to make the chrominance components visible in the color error map; and displaying the color error map.