Portland

Summary

Portland is a sequential colormap from plotly. Lightness spans 0.35–0.87, hue sweeps 234° from blue to red, and order holds under all three colorblind simulations.

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: plotly
• Source: plotly.js / plotly.py contributors
• Similar sequential maps: Blackbody (Plotly), Earth (Plotly), Electric, Jet, Plotly3, Rainbow (Plotly)
• All colormaps