# Jet

Canonical URL: https://colorcurio.us/colormaps/plotly.jet
Source type: Colormap
Type: sequential
Collection: plotly
Attribution: plotly.js / plotly.py contributors
License: MIT
Source: https://github.com/plotly/plotly.py/blob/main/_plotly_utils/colors/plotlyjs.py
Tags: rainbow, considered-harmful
Stops: 256

## Summary

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

MATLAB's classic jet ramp (kept as a baseline; perceptually problematic).

## Perceptual profile (OKLCh)

- Lightness: 0.276 → 0.377 (range 0.692, min 0.276, max 0.968); non-monotonic; midpoint 0.899
- Chroma: min 0.132, max 0.254, mean 0.188
- Hue: 264.1° → 29.2° (span 235.0°), path monotonic-ccw; quadrants: blue, azure, cyan, mint, green, chartreuse, yellow, orange, red
- Endpoint temperature: cool → warm
- Perceptual ΔE: total 223.7, mean/step 0.877, max step 1.780, smoothness 0.449, speed 0.877

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 178.2; preserves order: no
- Deuteranopia: ΔE total 173.5; preserves order: no
- Tritanopia: ΔE total 193.4; preserves order: no

## Related

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