This document provides a summary of color theory and color psychology concepts. It discusses the definition of color, color spectrum, color sources and history. It describes color systems like subtractive and additive color. It explains color properties including primary, secondary and tertiary colors using a color wheel. It discusses color harmony concepts such as analogous, complementary, split complementary, triad and tetrad colors. It also covers achromatic colors like tints, tones and shades. Finally, it provides an overview of color psychology including the psychological effects and meanings of different colors in various cultures.