# Spectral

Canonical URL: https://colorcurio.us/colormaps/colorbrewer.Spectral
Source type: Colormap
Type: diverging
Collection: colorbrewer
Attribution: Cynthia Brewer & Mark Harrower, ColorBrewer 2.0
License: Apache-2.0
Source: https://colorbrewer2.org/
Tags: diverging, colorbrewer, rainbow-like
Stops: 256

## Summary

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

ColorBrewer 2.0 diverging 'Spectral' (11-class anchors).

## Perceptual profile (OKLCh)

- Lightness: 0.449 → 0.484 (range 0.535, min 0.449, max 0.984); non-monotonic; midpoint 0.984
- Chroma: min 0.082, max 0.186, mean 0.123
- Hue: 7.8° → 289.0° (span 281.2°), path monotonic-cw; quadrants: red, orange, yellow, chartreuse, green, mint, cyan, azure, blue, violet
- Endpoint temperature: warm → cool
- Perceptual ΔE: total 174.6, mean/step 0.684, max step 1.430, smoothness 0.577, speed 0.684

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 149.3; preserves order: yes
- Deuteranopia: ΔE total 132.2; preserves order: yes
- Tritanopia: ΔE total 147.2; preserves order: yes

## Related

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