Bluered

Summary

Bluered is a diverging colormap from plotly. Two arms meet at a pivot of lightness 0.42, hue sweeps 125° from blue to red, and order holds under all three colorblind simulations.

Pure blue↔red 2-stop diverging.

Perceptual profile (OKLCh)

• Lightness: 0.452 → 0.628 (range 0.235, min 0.393, max 0.628); non-monotonic; midpoint 0.419
• Chroma: min 0.189, max 0.313, mean 0.228
• Hue: 264.1° → 29.2° (span 125.2°), path monotonic-cw; quadrants: blue, violet, magenta, rose, red
• Pivot: t 0.498, lightness 0.419, hue jump 8.1°, smoothness 0.996
• Endpoint temperature: cool → warm
• Perceptual ΔE: total 71.9, mean/step 0.282, max step 0.461, smoothness 0.564, speed 0.282

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 71.9; preserves order: yes
• Deuteranopia: ΔE total 82.2; preserves order: yes
• Tritanopia: ΔE total 88.1; preserves order: yes

Related

• Family: plotly
• Source: plotly.js / plotly.py contributors
• Similar diverging maps: Picnic
• All colormaps