Observable 10

Summary

Observable 10 is a 10-color categorical colormap from d3. Its colors span lightness 0.55–0.80 and chroma 0.01–0.21.

Observable Plot default; tuned for both light and dark backgrounds.

Perceptual profile (OKLCh)

• Lightness: 0.548 → 0.679 (range 0.249, min 0.548, max 0.797); non-monotonic; midpoint 0.652
• Chroma: min 0.013, max 0.208, mean 0.129
• Hue: 265.6° → 264.5° (span 276.8°), path folded; quadrants: blue, yellow, orange, mint, green, rose, magenta
• Endpoint temperature: cool → cool
• Perceptual ΔE: total 362.5, mean/step 40.275, max step 71.797, smoothness 0.555, speed 1.000

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 265.0; preserves order: no
• Deuteranopia: ΔE total 261.3; preserves order: no
• Tritanopia: ΔE total 348.0; preserves order: no

Related

• Family: d3
• Source: d3-scale-chromatic (Mike Bostock and contributors)
• Similar categorical maps: Category 10, Tableau 10
• All colormaps