# Coolwarm

Canonical URL: https://colorcurio.us/colormaps/vispy.coolwarm
Source type: Colormap
Type: diverging
Collection: vispy
Attribution: vispy 0.x, vispy/color/colormap.py
License: BSD-3-Clause
Source: https://vispy.org/api/vispy.color.colormap.html
Tags: Moreland-2009, blue-red, diverging, smooth-pivot
Stops: 256

## Summary

Coolwarm is a diverging colormap from the vispy collection. Inspect its perceptual lightness, chroma, and hue profile on colorcurio.us.

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
- 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: https://colorcurio.us/colormaps/families/vispy
- All colormaps: https://colorcurio.us/colormaps