# Cubehelix

Canonical URL: https://colorcurio.us/colormaps/matplotlib.cubehelix
Source type: Colormap
Type: sequential
Collection: matplotlib
Attribution: matplotlib developers
License: matplotlib (BSD-derived)
Source: https://github.com/matplotlib/matplotlib/blob/main/lib/matplotlib/_cm.py
Tags: perceptually-uniform, dark-bg, astronomy
Stops: 256

## Summary

Cubehelix is a sequential colormap from the matplotlib collection. Inspect its perceptual lightness, chroma, and hue profile on colorcurio.us.

Dave Green 2011 astronomy ramp; black→bright.

## Perceptual profile (OKLCh)

- Lightness: 0.000 → 1.000 (range 1.000, min 0.000, max 1.000); monotonic; midpoint 0.602
- Chroma: min 0.000, max 0.117, mean 0.069
- Hue: 0.0° → 0.0° (span 360.0°), path monotonic-ccw; quadrants: magenta, violet, blue, azure, cyan, mint, green, chartreuse, yellow, orange, red, rose
- Endpoint temperature: null → null
- Perceptual ΔE: total 209.6, mean/step 0.822, max step 1.326, smoothness 0.690, speed 0.822

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 147.3; preserves order: yes
- Deuteranopia: ΔE total 141.3; preserves order: yes
- Tritanopia: ΔE total 174.8; preserves order: yes

## Related

- Family: https://colorcurio.us/colormaps/families/matplotlib
- All colormaps: https://colorcurio.us/colormaps