In the Eye of the Beholder
Color Vision and the Quantification of Color
This chapter contrasts the tri-stimulus visual system of humans, based on three visual cones, with the tetra-stimulus visual system of birds, based on four visual cones. A key difference between the vision of humans and birds is that birds see ultraviolet light that is invisible to humans. Methods for quantifying plumage color are discussed in addition to methods for scoring the extent of color (patch size) and pigment symmetry.
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