colors are three

Originally there are only three colors in the world. The basic colors of red, green, and blue are used to create the secondary colors. Tertiary colors are created by mixing primary and secondary colors together.For human applications, three primary colors are usually used, since human color vision is trichromatic.For additive combination of colors, as in overlapping projected lights or in CRT displays, the primary colors normally used are red, green, and blue. For a subtractive combination of colors.Primary colors are not a fundamental property of light but are related to the physiological response of the eye to light. Fundamentally, light is a continuous spectrum of the wavelengths that can be detected by the human eye, an infinite-dimensional stimulus space.Humans and other species with three such types of color receptors are known as trichromats. scientists such as Thomas Young, James Clerk Maxwell, and Hermann von Helmholtz expressed various opinions about what should be the three primary colors to describe the three primary color sensations of the eye. Additive mixing of red and green light produces shades of yellow, orange, or brown. Mixing green and blue produces shades of cyan, and mixing red and blue produces shades of purple, including magenta. Mixing nominally equal proportions of the additive primaries results in shades of grey or white. * There are warm colors and cool colors. Warm colors tend to be orange, red, yellow, etc. and cool colors are greens, blues, and purples. * White, black, and grey are neutral colors.* When a color is tinted that means that it's getting lighter (has white added to it) and when it is a shade it is getting darker (has black added to it).