Color systems encodes values as hue, value and chroma mapped to category or magnitude. Munsell 1905; Brewer palettes (1994–) for maps; OKLCH in modern CSS.
In reports, ads and assignments it fits legends, brand systems, accessible data color. Skip it when rainbow defaults, or encoding two quantities in one hue.
Use when
- Use when 1 — legends, brand systems, accessible data color
- Use when 2 — Excel or Google Sheets
- Use when 3 — PowerPoint
- Use when 4 — lab reports and poster boards
- Use when 5 — Meta, Google and retail print
Avoid when
- Avoid when 1 — rainbow defaults, or encoding two quantities in one hue
- Avoid when 2 — 3-D, dual axes, rainbow scales
- Avoid when 3 — Undated numbers, undated time series
- Avoid when 4 — Four charts on one slide
Audiences
- Work — PowerPoint
- Ads — Meta, Google and retail print
- School — lab reports and poster boards
Color systems: honour hue, value and chroma mapped to category or magnitude, and switch when rainbow defaults, or encoding two quantities in one hue.