色彩体系把值编码为映射到类别或大小的色相、明度与彩度。孟塞尔 1905；布鲁尔色板（1994–）用于地图；现代 CSS 的 OKLCH。
工作报告、广告与作业中适合图例、品牌系统、可访问的数据色。若彩虹默认，或一个色相编码两个量，换一种形式。
Rules
- 规则 1 — Use 映射到类别或大小的色相、明度与彩度 as one channel, not two.
- 规则 2 — Direct labels beat a distant legend.
- 规则 3 — Do not hide zero. If you break the axis, say so.
- 规则 4 — Colour encodes category or magnitude, not both.
- 规则 5 — Put the claim in the title, not just “色彩体系”.
- 规则 6 — Source and period, even in small type.
Palette
- 色板 1 — Categories: distinct hues. Sequences: one hue, changing value.
- 色板 2 — Diverging: a neutral centre, emphasis at both ends.
- 色板 3 — One brand colour plus greys beats a rainbow.
- 色板 4 — Check contrast on a projector and in greyscale print.
Type
- 文字 1 — Tabular figures for numbers. Do not pour body copy into the chart.
- 文字 2 — Titles as sentences; axes as short nouns.
- 文字 3 — For CJK, drop weight one step and leave tracking.
色彩体系: honour 映射到类别或大小的色相、明度与彩度, and switch when 彩虹默认，或一个色相编码两个量.