How Does a Color Filter Work?

davebloggs007/CC-BY 2.0

A color filter works by absorbing certain wavelengths of color and transmitting the other wavelengths. For example, a yellow color filter absorbs all colors except yellow, letting only yellow through, so the objects viewed appear to be yellow. If a blue light from a blue filter his a red object, the blue color is absorbed and the object reflects no light, making it appear to be black.

ADVERTISEMENT