Art Colour Theory, terminology. Value = lightness/darkness. Saturation, intensity - intensity of pigments. Hue - the name of colour. (Undertone - from cool to warm). Chroma = colour purity. Four chroma groups of colours: Tints = hues mixed with white, Tones - hues with grey, Hues = pure saturated colours, Shades = hues mixed with black. Every group has cool, neutral and warm colours.