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 Many students of physics have seen a diagram similar to the one shown at the right. The diagram depicts three circles colored with the primary colors of light - red, green and blue. The primary colored circles overlap to produce other colors of light - known as the secondary colors of light: cyan, magenta and yellow. Complementary pairs of light colors are those colors that are exactly opposite each other on the diagram: red and cyan, magenta and green, and blue and yellow.
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Color Subtraction and Complementary Colors:
An object that is observed to be a specific color when illuminated with white light has absorbed the complementary color of the observed color. White light or R+ G + B was incident on the object. One or more of the components of white light were absorbed or subtracted and the remaining light colors were reflected to the observer's eye.
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The color of a shirt is not in the shirt itself, but rather in the light that the shirt reflects. If red, green and blue light shine on a shirt and the shirt appears red, then only the red light of red, green and blue incident light was reflected. So if only the red was reflected, then what happened to the green and blue light? It was subtracted or absorbed. So green and blue light - also known as cyan light - are absorbed by a shirt that looks red. Now think about the color wheel shown in the Dig That Diagram section and you will see the big idea. Cyan light - the complement of red light - is absorbed when a shirt appears red in the presence of white light.
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