We talk about a few tips & tricks for choosing effective, accessible colors for our data visualizations.
Here are a few tips to keep in mind when choosing individual colors or a color scale.
Make sure that your colors have enough contrast with their surroundings in all cases. If you're using Chrome, there is a great tool to check that your colors have enough contrast right in your dev tools. Learn how to use it in the Appendix.
Don't assume that your users can see your charts as clearly as you can. Almost 8 percent of males of North American descent have red-green color blindness. To make sure most people can encode the information from your color scale, stay away from scales where users have to distinguish between red and green.
Here's a simulation of what the above picture looks for people with red-green color blindness.