Choosing Colors
Lear how to choose colors in Altair.
In a chart, color helps to communicate a message by setting the scene and tone. It creates an emotional connection between the data and audience.
We can identify three main components in color:
Hue is the dominant color wavelength. Hue identifies color family or color name (such as red, green, purple, etc.).
Saturation describes the intensity of a color. Saturation defines how pure a color is.
Brightness is a measure of how light or dark a color appears.
Color palettes
Consider the following color palettes:
Sequential color palettes organize quantitative data from high to low using a single color in various gradients or saturations. We can use this type of palette to show a progression rather than a contrast.
Diverging color palettes highlight the ranges of quantitative data by using two contrasting hues on the extremes and a lighter-tinted mixture to highlight the middle range. A diverging palette shows where data is on a spectrum, such as cold to hot.
