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Data Visualization · Module 4 of 10

Colour and accessibility

Use colour wisely and make charts readable for everyone.

📖 Key ideas

  1. Sequential palettes for ordered values (light to dark).
  2. Diverging palettes for values around a midpoint.
  3. Categorical palettes for distinct groups (max ~7 colours).
  4. About 1 in 12 men have colour vision deficiency: avoid red-green only contrasts.
  5. Add labels or patterns, not just colour.
💡 Real-life example: Colour in charts is like spice in food: the right amount enhances, too much ruins.
Sequential paletteLight-to-dark for ordered data
Diverging paletteTwo hues around a midpoint
Categorical paletteDistinct colours for groups
Colour blindnessDifficulty distinguishing colours