Coolwarm

Summary

Coolwarm is a diverging colormap from vispy. Two arms meet at a pivot of lightness 0.90, hue sweeps 170° from violet to red, and order holds under all three colorblind simulations.

vispy preset 'coolwarm' (Kenneth Moreland 2009 diverging).

Perceptual profile (OKLCh)

• Lightness: 0.476 → 0.487 (range 0.421, min 0.476, max 0.897); non-monotonic; midpoint 0.896
• Chroma: min 0.001, max 0.195, mean 0.109
• Hue: 271.1° → 22.4° (span 170.4°), path monotonic-cw; quadrants: violet, blue, orange, red
• Pivot: t 0.502, lightness 0.897, hue jump 170.4°, smoothness 0.842
• Endpoint temperature: cool → warm
• Perceptual ΔE: total 125.5, mean/step 0.492, max step 0.917, smoothness 0.752, speed 0.492

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 116.7; preserves order: yes
• Deuteranopia: ΔE total 113.0; preserves order: yes
• Tritanopia: ΔE total 128.6; preserves order: yes

Related

• Family: vispy
• Source: vispy 0.x, vispy/color/colormap.py
• All colormaps