The remainder from 100%, if any, gives the amount of whiteness ( w). The blackness and the chromaticness together add up to less than or equal to 100%. No hue is considered to have visual similarity to both hues of an opponent pair i.e. This means that a color can be expressed as either Y (yellow), YR (yellow with a red component), R (Red), RB (red with a blue component), B (blue), etc. Ĭolors in the NCS are defined by three values, expressed in percentages, specifying the degree of blackness ( s, = relative visual similarity to the black elementary color), chromaticness ( c, = relative visual similarity to the "strongest", most saturated, color in that hue triangle), and hue ( Φ, = relative similarity to one or two of the chromatic elementary colors red, yellow, green and blue, expressed in at most two percentages). a saturated pink would be fully defined by its visual similarity to red, blue, black and white. experiences that can be defined in terms of similarity to the six elementary colors. All other experienced colors are considered composite perceptions, i.e. In the NCS all six are defined as elementary colors, irreducible qualia, each of which would be impossible to define in terms of the other elementary colors. The last four are also called unique hues. The NCS states that there are six elementary color percepts of human vision-which might coincide with the psychological primaries-as proposed by the hypothesis of color opponency: white, black, red, yellow, green, and blue.
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