Isolum CJO

Summary

Isolum CJO is a diverging colormap from colorcet. Two arms meet at a pivot of lightness 0.75, hue sweeps 164° from azure to orange, and order breaks under tritan simulation.

Perceptual profile (OKLCh)

• Lightness: 0.736 → 0.755 (range 0.020, min 0.735, max 0.755); non-monotonic; midpoint 0.742
• Chroma: min 0.002, max 0.159, mean 0.074
• Hue: 236.2° → 39.7° (span 163.8°), path monotonic-cw; quadrants: azure, blue, orange
• Pivot: t 0.800, lightness 0.749, hue jump 0.0°, smoothness 0.996
• Endpoint temperature: cool → warm
• Perceptual ΔE: total 55.1, mean/step 0.216, max step 0.427, smoothness 0.595, speed 0.216

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 42.7; preserves order: yes
• Deuteranopia: ΔE total 49.0; preserves order: yes
• Tritanopia: ΔE total 62.1; preserves order: no

Related

• Family: colorcet
• Source: Kovesi 2015 — "Good Colour Maps: How to Design Them" (arXiv:1509.03700)
• Similar diverging maps: Bjr, Bjy, Bkr, Bky, CB-Bwy, CB-Cwr, CET-D1, Diverging rainbow
• All colormaps