By Mark D. Fairchild
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Additional info for Color Appearance Models, 2nd edition (The Wiley-IS&T Series in Imaging Science and Technology)
Chromatic adaptation is the largely independent sensitivity control of the three mechanisms of color vision. 16, which shows that the overall height of the three cone spectral responsivity curves can vary independently. While chromatic adaptation is often discussed and modeled as independent sensitivity control in the cones, there is no reason to believe that it does not occur in opponent and other color mechanisms as well. , daylight, ﬂuorescent, and incandescent). Daylight contains relatively far more short-wavelength energy than ﬂuorescent light, and incandescent illumination contains relatively far more long-wavelength energy than ﬂuorescent light.
5 SPATIAL AND TEMPORAL PROPERTIES OF COLOR VISION No dimension of visual experience can be considered in isolation. The color appearance of a stimulus is not independent of its spatial and temporal characteristics. For example, a black and white stimulus ﬂickering at an appropriate temporal frequency can be perceived as quite colorful. The spatial and temporal characteristics of the human visual system are typically explored through measurement of contrast sensitivity functions. Contrast sensitivity functions (CSFs) in vision science are analogous to modulation transfer functions (MTFs) in imaging science.
6 shows the distribution of rods and cones across the retina. 6. First, notice the extremely large numbers of photoreceptors. In some retinal regions there are about 150 000 photoreceptors per square millimeter of retina! Also notice that there are far more rods (around 120 million per retina) than cones (around 7 million per retina). This might seem somewhat counterintuitive since cones function at high luminance levels and produce high visual acuity while rods function at low luminance levels and produce signiﬁcantly reduced visual acuity (analogous to low-speed ﬁne-grain photographic ﬁlm vs high-speed coarse-grain ﬁlm).