Values in Post-Impressionism rest in the mid-range - neither dramatically lit nor steeped in shadow. Built on cool foundations: the palette favours the blue-cyan-green arc. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. #6A4E39 delivers the chromatic peak at only 9.0% - a small shot of colour with outsized visual impact. The palette spans 50 value units: a measured range that delivers coherence over drama. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky.