This talk will describe an imaging system for color appearance in mesopic vision. Haploscopic color matches were carried out to investigate the color appearance under various illuminance levels, ranging from scotopic, mesopic to photopic levels. Using these experimental data, we developed a color appearance model in any illuminance level. The model takes into account of rod intrusion both in the two color opponent channels and the luminance channel so that hue, saturation and lightness change with illuminance level. Finally, we propose an imaging system that provides color appearance of any natural scene under any illuminance level.