Reflect light of relatively high saturation and brightnessįor a given degree of illumination. We saw in the introduction that in order to have high chroma, a surface must One-quarter, half, three-quarter and full "color-intensity". Denman Ross (1907) suggested using a relative scale of Maximum possible for the hue, as is implicit in the circular shape of the traditionalĪrtist's colour wheel. System, chroma can also be described on a relative scale between zero and the Chroma ranges beyondĢ0 for some normal reflecting materials, as is as high as 30 for someĪs well as being measurable in perceptually equal steps, as in the Munsell The range of possible chroma for each hue increases. Inĭoing so he showed that the maximum chroma actually attainable in surface Quantified the term as an open-ended scale of perceptually uniform steps,ĭefined in relation to his atlas of colour samples (Munsell, 1915). The term chroma was invented by Munsell (1905), who subsequently A and D are in fact exactly the same screen colour, butĪre seen in normal viewing mode as a light colour in shadowĪnd a dark colour in light respectively. In order to create the illusion of a surface of uniform chroma Of light, and represent it with paint areas of different lightness and chroma, Ttonal painters would observe this difference in brightness and "colorfulness" More "colorful" in higher illumination (B,D) than in low illumination Recent technical literature of colour appearance, chroma is defined as "colorfulness" of an object relative to the brightness of a white object similarly illuminated, which allows for the fact that a surface of a given chroma displays increasing colorfulness as the level of illumination increases (Figure 8.4). The degree of visual difference from a neutral grey of the same lightness. Section 1.5 The Dimensions of Colour: ChromaĬhroma is the perceived strength of a surface colour, Section 1.3 The Dimensions of Colour: Lightness For much more recent discussions of lightness and chroma please see: They are left here for the moment because some of the diagrams have been linked to by other sites or reproduced in publications. Please note: The pages forming Part 8 were part of the original Dimensions of Colour site uploaded in 2007 and have not been updated recently.
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