Scientists finally complete Schrödinger’s 100-year-old color theory

Researchers at Los Alamos National Laboratory have completed a century-old mathematical framework for color perception originally proposed by physicist Erwin Schrödinger. Led by scientist Roxana Bujack, the team addressed a critical flaw in Schrödinger’s 1920s model by defining the neutral axis—the line of grays from black to white—which had never been formally established. The breakthrough reframes hue, saturation, and lightness as intrinsic properties of color space rather than learned perceptions. By using geometric metrics, the researchers demonstrated that these qualities emerge from the structure of color itself, not external factors like culture. Their work resolves a foundational gap in Schrödinger’s Riemannian model, which had relied on undefined relationships to the neutral axis. The team also corrected two key limitations in the older model. First, they accounted for the Bezold-Brücke effect—where varying light intensity alters perceived hue—by using the shortest geometric path between colors instead of straight-line assumptions. Second, they improved representation of diminishing returns in color perception by applying non-Riemannian spatial calculations. Human color vision depends on three cone cell types (red, green, and blue), creating a three-dimensional color space. Schrödinger’s original model built on Bernhard Riemann’s 19th-century insight that color spaces are curved, not flat. However, the neutral axis’s undefined nature left the model incomplete until Bujack’s team provided a rigorous geometric definition. The research was presented at the Eurographics Conference on Visualization and builds on Los Alamos’ broader work in color perception. By formalizing Schrödinger’s vision, the team’s advancements could enhance precision in color technologies, scientific visualizations, and human vision studies.