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that more closely models the human experience is the HSV? color space which arranges colors in a three dimensional cone. If the pure spectral colors are extended by mixtures of red and blue, they can be arranged in a circle (which was already known to Newton), the mouth of the cone. The position of a color on this circle is its hue. In the HSV space, every color is specified by its hue, saturation (distance from the circle's center) and luminocity (height inside the cone).
that more closely models the human experience is the HSV? color space which arranges colors in a three dimensional cone. If the pure spectral colors are extended by mixtures of red and blue, they can be arranged in a circle (which was already known to Newton), the mouth of the cone. The position of a color on this circle is its hue. In the HSV space, every color is specified by its hue, saturation (distance from the circle's center) and luminosity (height inside the cone).
Added: 59a60,61
Note that the colour experience of a given light mixture may vary with absolute luminosity, due to the fact that both rods and cones are active at once in the eye, with each having different color curves, and rods taking over gradually from cones as the brightness of the scene is reduced. This effect leads to a change in color rendition with absolute illumination levels that can be summarised in the "[Kruithof curve]?".
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