TAILIEUCHUNG - Color Theory And Modeling For Computer Graphics P2

As we have already mentioned previously, it is accepted among color scientists as well as psychologists and others who have studied human color vision, that color is a tri-stimulus phenomenon, ., human color perception is a threedimensional space. Color scientists often refer to this as trichromacy. | Human Vision 17 INTRODUCTION TO HUMAN COLOR VISION Now that we have covered the basic aspects of luminance and contrast perception we are ready to study human color vision. Color vision trichromacy As we have already mentioned previously it is accepted among color scientists as well as psychologists and others who have studied human color vision that color is a tri-stimulus phenomenon . human color perception is a threedimensional space. Color scientists often refer to this as trichromacy. Trichromacy starts at the retina where the cones provide three broadband filters tuned to three overlapping ranges of wavelength often referred to as the blue green and red filters though these are misnomers as we will demonstrate shortly. First the color names do not represent the precise colors where these filters peak respectively. The so-called blue mechanism peaks at a wavelength we would call blue but the green and red mechanisms are largely overlapping and peak at two close wavelengths we would probably call yellow or greenish yellow. More important each cone filter mechanism by itself is color blind see Figures . For example in Figure the signal out of a particular cone filter would be indentical whether it is the result of the component on the left of the peak of the filter or the one on the right. The essence of trichromacy is that the perceived hue depends on the threedimensional vector of signals detected by the three cone mechanisms in combination. Due to the many-to-one mapping from the infinite-dimensional light vector to the three-dimensional vector at the retina the sensation of any color can be created by exposing the three cones to many different three-dimensional vectors metamerism . This means that even with trichromacy there are ambiguities but with fewer cone mechanisms color perception becomes deficient or dissap-pears altogether that is the essence of color deficiencies . For example equal excitations of the medium and long .

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