Rainbow
Summary
Rainbow is a sequential colormap from colorcet. Lightness spans 0.47–0.85, hue sweeps 296° from blue to magenta, and order breaks under protan, deutan, and tritan simulation.
Perceptual profile (OKLCh)
- Lightness: 0.470 → 0.807 (range 0.380, min 0.470, max 0.850); non-monotonic; midpoint 0.849
- Chroma: min 0.077, max 0.284, mean 0.168
- Hue: 264.1° → 328.1° (span 296.0°), path monotonic-ccw; quadrants: blue, azure, cyan, mint, green, chartreuse, yellow, orange, red, rose, magenta
- Endpoint temperature: cool → cool
- Perceptual ΔE: total 196.8, mean/step 0.772, max step 1.940, smoothness 0.553, speed 0.772
Colorblind safety (ΔE under simulated CVD)
- Protanopia: ΔE total 165.4; preserves order: no
- Deuteranopia: ΔE total 156.4; preserves order: no
- Tritanopia: ΔE total 132.3; preserves order: no
Related
- Family: colorcet
- Source: Kovesi 2015 — "Good Colour Maps: How to Design Them" (arXiv:1509.03700)
- Similar sequential maps: Bgy, Bgyw, Blues (perceptual), Bmw, Bmy, CB-Kbw, CB-Kyw, CB-Kcw
- All colormaps