# Color

There are 3 main uses for color in a visualization:

* Patterns
* Labeling
* Highlighting

We encode **quantities** with color to visualize **patterns** in the data. **Segmentation** and **heat maps** are popular examples for this.

Color can also be used to **label** or **group** items together.

**Highlighting** is used to allow the viewer to **focus** on a specific part of the visualization. For example, highlighting a certain line in a line chart that has multiple lines.

This section deals with 3 aspects of color in visualization:

1. Color Perception
2. Color Specification
3. Color Use


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