# OrRd

Canonical URL: https://colorcurio.us/colormaps/colorbrewer.OrRd
Source type: Colormap
Type: sequential
Collection: colorbrewer
Attribution: Cynthia Brewer & Mark Harrower, ColorBrewer 2.0
License: Apache-2.0
Source: https://colorbrewer2.org/
Tags: sequential, colorbrewer, orange-red, light-start
Stops: 256

## Summary

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

ColorBrewer 2.0 sequential multi-hue 'OrRd' (9-class anchors).

## Perceptual profile (OKLCh)

- Lightness: 0.979 → 0.375 (range 0.605, min 0.375, max 0.979); monotonic; midpoint 0.755
- Chroma: min 0.017, max 0.205, mean 0.131
- Hue: 76.1° → 29.2° (span 48.0°), path monotonic-ccw; quadrants: yellow, orange, red
- Endpoint temperature: warm → warm
- Perceptual ΔE: total 80.8, mean/step 0.317, max step 0.448, smoothness 0.824, speed 0.317

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 73.6; preserves order: yes
- Deuteranopia: ΔE total 67.2; preserves order: yes
- Tritanopia: ΔE total 76.9; preserves order: yes

## Related

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