Rainbow

Summary

Rainbow is a sequential colormap from tol. Lightness spans 0.31–0.94, hue sweeps 293° from violet to red, and order breaks under protan, deutan, and tritan simulation.

Tol's continuous 'discrete rainbow' anchor sequence (rainbow_linear) — multi-hue smooth rainbow.

Perceptual profile (OKLCh)

• Lightness: 0.945 → 0.305 (range 0.639, min 0.305, max 0.945); non-monotonic; midpoint 0.695
• Chroma: min 0.021, max 0.216, mean 0.118
• Hue: 274.0° → 29.9° (span 292.9°), path monotonic-ccw; quadrants: violet, magenta, blue, azure, cyan, mint, green, chartreuse, yellow, orange, red
• Endpoint temperature: cool → warm
• Perceptual ΔE: total 230.3, mean/step 0.903, max step 1.068, smoothness 0.965, speed 0.903

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 172.0; preserves order: no
• Deuteranopia: ΔE total 166.2; preserves order: no
• Tritanopia: ΔE total 226.2; preserves order: no

Related

• Family: tol
• Source: Paul Tol, "Colour Schemes" (SRON/EPS/TN/09-002)
• Similar sequential maps: Incandescent, Iridescent, Smooth rainbow, WhOrBr, YlOrBr
• All colormaps