| 单词 | colour |
| 释义 | colour The sensation produced when light of different wavelengths falls on the human eye. Although the visible spectrum covers a continously varying range of colours from red to violet it is usually split into seven colours (the visible spectrum ) with the following approximate wavelength ranges: red 740–620 nmA mixture of all these colours in the proportions encountered in daylight gives white light; other colours are produced by varying the proportions or omitting components. A coloured light has three attributes: its hue , depending on its wavelength; its saturation , depending on the degree to which it departs from white light; and its luminosity. Coloured objects that owe their colour to pigments or dyes absorb some components of white light and reflect the rest. For example, a red book seen in white light absorbs all the components except the red, which it reflects. This is called a subtractive process as the final colour is that remaining after absorption of the rest. This is the basis of the process used in colour photography. Combining coloured lights, on the other hand, is an additive process and this is the method used in colour television. See also primary colours |
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