The primary colors are red, yellow, and blue. Secondary colors are green, purple and orange, created by mixing two primary colors. Tertiary colors mix a primary and secondary, examples being red-orange. Compound colors mix all primaries, like brown. Analogous colors sit beside each other on the color wheel. Complementary colors sit opposite. Warm colors like red and yellow create a warm feeling, while cool colors like blue seem to recede. The CMYK model uses pigments for print and RGB uses light for screens.