# Delta

Canonical URL: https://colorcurio.us/colormaps/cmocean.delta
Source type: Colormap
Type: diverging
Collection: cmocean
Attribution: Thyng, Greene, Hetland, Zimmerle, DiMarco 2016, Oceanography 29(3)
License: MIT
Source: https://matplotlib.org/cmocean/
Tags: oceanography, blue-yellow
Stops: 256

## Summary

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

Designed for free-surface deviation / anomaly fields.

## Perceptual profile (OKLCh)

- Lightness: 0.248 → 0.240 (range 0.743, min 0.240, max 0.983); non-monotonic; midpoint 0.983
- Chroma: min 0.019, max 0.158, mean 0.099
- Hue: 263.8° → 137.5° (span 171.6°), path folded; quadrants: blue, azure, cyan, mint, green, chartreuse
- Endpoint temperature: cool → neutral
- Perceptual ΔE: total 192.9, mean/step 0.756, max step 7.990, smoothness 0.393, speed 0.756

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 166.8; preserves order: yes
- Deuteranopia: ΔE total 168.3; preserves order: yes
- Tritanopia: ΔE total 191.2; preserves order: yes

## Related

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