The value structure of Piero della Francesca is mid-key: quiet, controlled, and cohesive. Piero della Francesca balances warm and cool with remarkable evenness, giving the composition its characteristic vibrancy. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. The most saturated colour, #713D3D, is reserved to 2.4% of the surface, where it acts as a focal punctuation. The value range of 47 units sits in the comfortable middle: enough depth, enough light, neither extreme. In the context of Piero della Francesca's full range of palettes, group 9 represents one movement in an ongoing chromatic dialogue.