Contrast of extension balances color areas by their luminosity: yellow needs three times less area than violet to hold equal visual weight

Two colors may be in balance compositionally when their relative areas are inverse to their luminosities (light values). Goethe’s ratios: yellow:orange:red:violet:blue:green = 9:8:6:3:4:6. Derived harmonious area ratios for complementary pairs: yellow:violet = 1/4:3/4; orange:blue = 1/3:2/3; red:green = 1/2:1/2. A small amount of a bright, light color is ‘enough’ to balance a large area of a dark color. When areas deviate from harmonious proportions, contrast of extension becomes expressive: a minute accent color becomes visually provocative, seeming to intensify defensively. Extension contrast also amplifies any other contrast — it modifies hue contrast, simultaneous contrast, and saturation contrast. Importantly: color areas should not be predetermined by drawn outlines but should emerge from the chromatic forces of hue, saturation, and brilliance.

Examples

In a generative patch: a tiny yellow accent in a large violet composition will dominate perception even at 1/4 the area. In GLSL: weight complementary colors by area inverse to their luma to achieve visual balance.

Assessment

Calculate the harmonious area ratio for orange:blue; explain why a ‘minority’ color appears more vivid than when present in harmonious amounts; redesign a yellow/violet composition to be expressive rather than harmonious by adjusting area.