Perceptual color systems Munsell https://en.wikipedia.org/wiki/Munsell_color_system OSA UCS https://en.wikipedia.org/wiki/OSA-UCS CIE LAB https://en.wikipedia.org/wiki/CIELAB_color_space Jzazbz https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-13-15131