The Perception And Discrimination Of Color

At least for simple viewing situations, color experience has been traditionally ordered along three principal perceptual dimensions—brightness, hue, and saturation. The first is considered to be part of both achromatic and chromatic features of color, whereas the latter two are chromatic features. In terms of everyday experience, brightness is that aspect of a percept most closely associated with changes in the intensity of a light yielding visual experience along a dimension that encompasses verbal descriptions running from dim to bright to dazzling. Hue is primarily correlated with the wavelength of light and is typically designated through the use of common color terms—red, green, blue, and so on. Saturation is the degree to which a chromatic sensation differs from an achromatic sensation of the same brightness—for example, yielding sensory experiences that are situated on a continuum changing from white (achromatic) to light pink and to a deep red.

Many aspects of color have been conveniently summarized in geometric configurations. The three perceptual dimensions of color just described are often represented in a so-called color solid. In this color solid, hues are positioned around the circumference of a circle where they are placed in the order in which they are perceived in a spectrum. The ends of the spectrum (reds and blues) are connected through a series of purple hues. White is located at the center of the hue circle and saturation is then represented as increasing along lines drawn from the center to the various hues located on the circle circumference. The plane surface thus formed encompasses chromatic variation at a single brightness level; increases and decreases in brightness from this level are plotted along a third dimension that runs perpendicular to the plane. Within this color solid any particular color experience can be conceived as representing a location in the three-dimensional space.

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Breaking Bulimia

We have all been there: turning to the refrigerator if feeling lonely or bored or indulging in seconds or thirds if strained. But if you suffer from bulimia, the from time to time urge to overeat is more like an obsession.

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