# Portland

Canonical URL: https://colorcurio.us/colormaps/plotly.portland
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: multi-hue
Stops: 256

## Summary

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

5-anchor blue→yellow→red Portland ramp.

## Perceptual profile (OKLCh)

- Lightness: 0.352 → 0.567 (range 0.515, min 0.352, max 0.867); non-monotonic; midpoint 0.865
- Chroma: min 0.080, max 0.217, mean 0.144
- Hue: 262.3° → 27.9° (span 234.5°), path monotonic-ccw; quadrants: blue, azure, cyan, mint, green, chartreuse, yellow, orange, red
- Endpoint temperature: cool → warm
- Perceptual ΔE: total 154.0, mean/step 0.604, max step 1.356, smoothness 0.517, speed 0.604

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 127.0; preserves order: yes
- Deuteranopia: ΔE total 114.8; preserves order: yes
- Tritanopia: ΔE total 123.6; preserves order: yes

## Related

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