Smooth rainbow

Summary

Smooth rainbow is a sequential colormap from tol. Lightness spans 0.54–0.72, hue sweeps 61° from rose to orange, and order breaks under protan, deutan, and tritan simulation.

SRON 2018 perceptual smooth rainbow.

Perceptual profile (OKLCh)

• Lightness: 0.560 → 0.660 (range 0.177, min 0.544, max 0.721); non-monotonic; midpoint 0.720
• Chroma: min 0.147, max 0.229, mean 0.185
• Hue: 352.5° → 35.4° (span 60.7°), path monotonic-cw; quadrants: rose, red, orange
• Endpoint temperature: warm → warm
• Perceptual ΔE: total 65.2, mean/step 0.256, max step 0.532, smoothness 0.489, speed 0.256

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 65.0; preserves order: no
• Deuteranopia: ΔE total 57.6; preserves order: no
• Tritanopia: ΔE total 36.5; preserves order: no

Related

• Family: tol
• Source: Paul Tol — SRON Technical Note (2018)
• Similar sequential maps: Incandescent, Iridescent, Rainbow, WhOrBr, YlOrBr
• All colormaps