# Copper

Canonical URL: https://colorcurio.us/colormaps/matplotlib.copper
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: dark-bg, single-hue
Stops: 256

## Summary

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

Black→copper→tan.

## Perceptual profile (OKLCh)

- Lightness: 0.000 → 0.865 (range 0.865, min 0.000, max 0.865); monotonic; midpoint 0.558
- Chroma: min 0.000, max 0.136, mean 0.084
- Hue: 0.0° → 72.7° (span 72.7°), path monotonic-cw; quadrants: orange, yellow
- Endpoint temperature: null → warm
- Perceptual ΔE: total 81.8, mean/step 0.321, max step 0.539, smoothness 0.824, speed 0.321

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 69.4; preserves order: yes
- Deuteranopia: ΔE total 73.3; preserves order: yes
- Tritanopia: ΔE total 79.5; preserves order: yes

## Related

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