Color theory describes how colors interact and how they affect perception. It covers the color wheel, harmony schemes, contrast, and the psychological associations people bring to different hues. Artists and designers have studied these ideas for centuries. Isaac Newton mapped the visible spectrum onto a wheel in the 17th century. Later theorists added concepts like complementary colors, warm and cool tones, and simultaneous contrast.

Designers use color theory to build palettes that feel coherent. Complementary colors sit opposite each other on the wheel and create high contrast. Analogous colors sit next to each other and create harmony. Triadic schemes use three evenly spaced colors for lively balance. Beyond the wheel, context matters. The same red can feel aggressive on one background and warm on another. Culture shapes meaning too. White signals purity at a Western wedding and mourning at a Chinese funeral.

Core schemes

• Complementary: opposite colors, high contrast.
• Analogous: adjacent colors, harmonious.
• Triadic: three evenly spaced colors.
• Monochromatic: one hue in many values.

Color theory is a guide, not a rulebook. The best palettes often break the rules on purpose, and the designer knows exactly why.