Values in Luca Signorelli rest in the mid-range - neither dramatically lit nor steeped in shadow. The dominant temperature is warm, with earth tones and fire-hues setting the emotional key. Saturation is measured and controlled, giving the palette presence without visual aggression. The most saturated colour, #CE974A, is reserved to 10.5% of the surface, where it acts as a focal punctuation. A value spread of 62 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. Luca Signorelli's palette 4 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.