The ArcGIS API for JavaScript provides hundreds of color ramps to developers to improve the mapping experience. Numerous cartographers with decades of experience in color theory and knowledge of how perceptual differences between colors work created these color ramps using Adobe Illustrator.
More than 270 of the color ramps available are colorblind friendly. Each ramp was individually tested with a color blindness simulator such as ColorOracle to verify that the ramp shows detectable color variation when the three types of color blindness are simulated.
Read the Visualization best practices and Creating visualizations manually guide pages and explore the visualization sample code to learn how to use these color ramps in a layer's renderer.
Choosing a color ramp
A color ramp belongs to one or more tag categories and consists of a number of colors. When searching for a specific color ramp, select one or more tags and a number of colors in the ramp. You can also start with predefined color (or set of colors) by using a color's hexadecimal value or a series of hexadecimal values to filter the color ramp selection. Once a color ramp has been isolated, click on the individual color ramp to view and copy its hexadecimal or rgba values.
There are some tag categories that do not contain all of the number of color combinations. When filtering for hexadecimal values including the hash # at the beginning is optional.