law of simultaneous contrast

The law of simultaneous contrast describes how the perception of a color is affected by adjacent colors. When two colors are placed next to each other, they mutually influence each other's hue, value, and intensity. This phenomenon, also referred to as the law of simultaneous contrast, was studied by the 19th-century physicist Michel-Eugène Chevreul.12

For example, a light, dull red next to a dark, bright yellow will make the yellow appear darker, brighter, and greener. Simultaneously, the red will appear lighter, duller, and bluer. This mutual enhancement of opposites causes colors to appear more intense when juxtaposed with their complementary colors.123