Rainbow (Plotly)

Summary

Rainbow (Plotly) is a sequential colormap from plotly. Lightness spans 0.35–0.92, hue sweeps 324° from rose to red, and order breaks under protan, deutan, and tritan simulation.

Plotly 9-anchor rainbow.

Perceptual profile (OKLCh)

• Lightness: 0.441 → 0.628 (range 0.575, min 0.349, max 0.924); non-monotonic; midpoint 0.878
• Chroma: min 0.126, max 0.306, mean 0.222
• Hue: 353.7° → 29.2° (span 324.4°), path monotonic-ccw; quadrants: rose, magenta, violet, blue, azure, cyan, mint, green, chartreuse, yellow, orange, red
• Endpoint temperature: warm → warm
• Perceptual ΔE: total 228.1, mean/step 0.894, max step 2.432, smoothness 0.377, speed 0.894

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 167.3; preserves order: no
• Deuteranopia: ΔE total 166.6; preserves order: no
• Tritanopia: ΔE total 214.5; preserves order: no

Related

• Family: plotly
• Source: plotly.js / plotly.py contributors
• Similar sequential maps: Blackbody (Plotly), Earth (Plotly), Electric, Jet, Plotly3, Portland
• All colormaps