What is Color Theory?
Color theory is the foundation of visual design—a systematic framework that explains how colors interact, combine, and affect human perception. Whether you're a designer choosing a brand palette or a developer implementing accessible interfaces, understanding color theory is essential.
The Color Wheel
The color wheel, invented by Sir Isaac Newton in 1666, organizes colors in a circular format that reveals their relationships.
Primary Colors
Red, Yellow, and Blue form the foundation. These colors cannot be created by mixing other colors.
Secondary Colors
Orange, Green, and Purple—created by mixing two primary colors.
Tertiary Colors
Six colors created by mixing primary and secondary colors: Red-Orange, Yellow-Orange, Yellow-Green, Blue-Green, Blue-Violet, Red-Violet.
Color Harmonies
Complementary
Colors opposite on the wheel
Analogous
Colors adjacent on the wheel
Triadic
Three colors equally spaced
Split-Complementary
One color + two adjacent to its complement
Tetradic
Four colors in a rectangle pattern
Monochromatic
Variations of a single hue
Color Psychology
red
Energy, passion, urgency
CTAs, sales, food industry
orange
Warmth, enthusiasm, creativity
Entertainment, youth brands
yellow
Optimism, clarity, warmth
Warnings, highlights, children
green
Nature, growth, health
Eco brands, finance, health
blue
Trust, calm, professionalism
Tech, finance, healthcare
purple
Luxury, creativity, wisdom
Beauty, luxury brands
black
Elegance, power, sophistication
Luxury, fashion, tech