Iridescent

Summary

Iridescent is a sequential colormap from tol. Lightness falls monotonically from 0.99 to 0.35, hue sweeps 260° from chartreuse to rose, and order holds under all three colorblind simulations.

Sequential pastel-to-purple; CVD-friendly.

Perceptual profile (OKLCh)

• Lightness: 0.986 → 0.350 (range 0.636, min 0.350, max 0.986); monotonic; midpoint 0.789
• Chroma: min 0.024, max 0.091, mean 0.066
• Hue: 99.1° → 359.1° (span 260.0°), path monotonic-cw; quadrants: chartreuse, green, mint, cyan, azure, blue, violet, magenta, rose
• Endpoint temperature: neutral → warm
• Perceptual ΔE: total 118.0, mean/step 0.463, max step 0.896, smoothness 0.705, speed 0.463

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 99.4; preserves order: yes
• Deuteranopia: ΔE total 98.4; preserves order: yes
• Tritanopia: ΔE total 117.8; preserves order: yes

Related

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