Discrete rainbow

Summary

Discrete rainbow is a 29-color categorical colormap from tol. Its colors span lightness 0.27–0.94 and chroma 0.02–0.23.

Up to 23 mutually distinct hues.

Perceptual profile (OKLCh)

• Lightness: 0.945 → 0.266 (range 0.678, min 0.266, max 0.945); non-monotonic; midpoint 0.685
• Chroma: min 0.021, max 0.229, mean 0.121
• Hue: 274.0° → 34.9° (span 310.2°), path folded; quadrants: violet, magenta, rose, blue, green, chartreuse, yellow, orange, red
• Endpoint temperature: cool → warm
• Perceptual ΔE: total 287.9, mean/step 10.283, max step 41.240, smoothness 0.193, speed 1.000

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 231.2; preserves order: no
• Deuteranopia: ΔE total 222.6; preserves order: no
• Tritanopia: ΔE total 277.8; preserves order: no

Related

• Family: tol
• Source: Paul Tol — SRON Technical Note (2018)
• Similar categorical maps: Bright, Dark, High Contrast, Land Cover, Light, Medium Contrast, Muted, Pale
• All colormaps