Isolum CJM

Summary

Isolum CJM is a diverging colormap from colorcet. Two arms meet at a pivot of lightness 0.79, hue sweeps 109° from azure to rose, and order holds under all three colorblind simulations.

Perceptual profile (OKLCh)

• Lightness: 0.782 → 0.801 (range 0.027, min 0.774, max 0.801); non-monotonic; midpoint 0.784
• Chroma: min 0.004, max 0.148, mean 0.072
• Hue: 224.7° → 331.1° (span 109.4°), path monotonic-cw; quadrants: azure, rose
• Pivot: t 0.800, lightness 0.794, hue jump 0.0°, smoothness 0.996
• Endpoint temperature: cool → warm
• Perceptual ΔE: total 55.9, mean/step 0.219, max step 0.425, smoothness 0.587, speed 0.219

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 36.5; preserves order: yes
• Deuteranopia: ΔE total 35.8; preserves order: yes
• Tritanopia: ΔE total 56.6; preserves order: yes

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