A standard RGB-based color scale and a rainbow color scale.

A standard RGB-based color scale and a rainbow color scale.

Elegant Figures

ggplot2: Elegant Graphics for Data Analysis (3e) - 11 Colour scales and legends

D.3 Basic R colors Data Science for Psychologists

Juxtaposition of the RGB rainbow color map and an HCL-based rainbow.

How rainbow colour maps can distort data and be misleading

Rainbow Color : Color « 2D Graphics GUI « Java

Rainbow Tutorial [FreeStyler Wiki]

Color Survey Results – xkcd

ggplot2: Elegant Graphics for Data Analysis (3e) - 11 Colour scales and legends

Color in a Perceptual Uniform Way, by Theresa-Marie Rhyne, Nightingale

Choosing Color Palettes in Displayr - Displayr

Ultra HD 4K TV color, part II: The (near) future - CNET

Ultimate Guide for a Good UI: Color, by Jake Park

Learn How to Choose Right Heatmap Colors Palette