In the region where the green light is blocked, the red and blue lights combine to form magenta. In the region where the blue light is blocked, the red and green lights combine to form yellow. By adding various amounts of red , green, and blue light we can produce any color in the spectrum. For this reason, red, green, and blue are called additive primary colors . Color televisions and computer monitors use additive mixing of light to produce all the colors of the rainbow.
Complementary colors are any two colors that when combined produce white light.
The color of an object depends on the color of the light it reflects or transmits. In painting and printing, the primaries are often said to be red, yellow and blue, but they are actually magenta, yellow and cyan. Photographs and Their Negatives Look at colored photographs and their corresponding negatives. This exhibit starts with colored lights combined to form white light. Shadows are used to isolate colored light.