![]() Hering noted several difficulties with using these attributes to describe colour in absolute terms, especially that the clarity of a chromatic colour cannot be determined exactly ( ibid., p. Object colours could be compared in terms of the proportions of these components in various ways, for example in terms of the relative degree to which the clear hue was veiled by a grey containing black and white in a particular proportion. This way of perceiving object colours was discussed by Ewald Hering (1878 ), who illustrated it in the form of a veiling triangle with points representing "completely pure white", "completely pure black" and the perfectly "clear" hue (e.g. Another set of perceived colour attributes, not defined by the CIE, consists of proportions of black, white and colour content considered as components making up an object colour. The CIE International Lighting Vocabulary does not claim that hue, brightness, lightness, colourfulness, saturation and chroma are the exclusive or even the most "natural" attributes of colour, but states only that perceived colour can be described in terms of these six defined attributes. In the Ostwald system the "Full" (most chromatic) colour of each hue is located on the equator of the space, whose vertical dimension therefore does not represent absolute lightness. This blue-yellow plate is one of twelve plates displaying 24 hues that together describe a colour space in the form of a symmetrical double cone. ![]() Plate from one of Wilhelm Ostwald's colour atlases (the Farbkoerper, 1919), with red arrows added to indicate increasing black and white content. Brilliance Black and White Content (Ostwald System)įigure 1.8.1. ![]() Blackness and Chromaticness (Natural Colour System).Black and White Content (Ostwald System).Brilliance, Blackness, Ostwald, NCS 1.8 The Dimensions of Colour: Blackness and Brilliance
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