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英语美文-创造颜色

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有两种方法可以在照片中创建颜色。一种方法叫做“加法”,它从三种基本颜色开始,然后把它们加在一起产生其他颜色。第二种方法叫减色法,它从白光(光谱中所有颜色的混合物)开始,通过去掉一些或所有其他颜色来得到想要的颜色。在加色法中,不同颜色的光结合在一起产生不同的其他颜色。三种加色原色是绿色、红色和蓝色(每一种占总光谱波长的三分之一)。它们以不同的比例混合,可以产生各种颜色。绿色和红色混合产生黄色,红色和蓝色混合产生洋红色,绿色和蓝色混合产生青色。当这三束主色光的相同部分重叠时,混合物在人眼中呈现白色。在减色法中,染料(如油漆或彩色照相材料)吸收某些波长,因此只传递光谱的一部分,就产生了颜色。减色法三原色是青色(带蓝色的绿色)、品红色(带紫色的粉色)和黄色;这些是分别吸收红色、绿色和蓝色波长的色素或染料,从而从白光中减去它们。这些染料颜色是红、绿、蓝这三种加色原色的互补色。适当地组合,减色法三原色可以吸收所有颜色的光,产生黑色。但是,它们以不同的比例混合也可以产生光谱中的任何颜色。无论一种特定的颜色是通过把不同颜色的光加在一起还是通过从总光谱中减去一些光得到的,其结果看起来都是一样的。早期彩色摄影采用加色法。然而,减色法虽然需要复杂的化学技术,但已被证明更加实用,是所有现代彩色电影的基础。
There are two ways to create colors in a photograph. One method, called additive, starts with three basic colors and adds them together to produce some other colors. The second method, called subtractive, starts with white light (a mixture of all colors in the spectrum) and by taking away some or all other colors leaves the one desired. In the additive method separate colored lights are combined to produce various other colors. The three additive primary colors are green, red and blue (each proportions, about one third of the wavelengths in the total spectrum). Mixed in varying proportions, they can produce all colors. Green and red light mix to produce yellow, red and blue light mix to produce magenta, green and blue mix to produce cyan. When equal parts of all three of these primary colored beams of light overlap, the mixture appears white to the eye. In the subtractive process, colors are produced when dye (as in paint or color photographic materials) absorbs some wavelengths and so passes on only part of the spectrum. The subtractive primaries are cyan (a blulish green), magenta (a purplish pink), and yellow; these are the pigments or dyes that absorb red, green and blue wavelengths, respectively, thus subtracting them from white light. These dye colors are the omplementary colors to the three additive primaries of red, green and blue. Properly combined, the subtractive primaries can absorb all colors of light, producing black. But, mixed in varying proportions they too can produce any color in the spectrum. Whether a particular color is obtained by adding colored lights together or by subtracting some light from the total spectrum, the result looks the same to the eye. The additive process was employed for early color photography. But the subtractive method, while requiring complex chemical techniques, has turned out to be more practical and is the basis of all modern color films.
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