Color vision is the ability of an organism or machine to distinguish objects based on the
wavelengths (or
frequencies) of the
light they
reflect,
emit, or
transmit.
Colors can be measured and quantified in various ways; indeed, a person's perception of colors is a subjective process whereby the
brain responds to the stimuli that are produced when incoming light reacts with the several types of
cone cells in the
eye. In essence, different people see the same illuminated object or light source in different ways.