Principles of color technology by Billmeyer Fred W

Author:Billmeyer, Fred W
Language: eng
Format: epub
Tags: Couleur, Color, Colorimétrie, Couleur -- Technologie, Colorants, Colorimetry, Colorimetrie
ISBN: 9780471030522
Publisher: New York : Wiley
Published: 1981-10-25T16:00:00+00:00

C

The absorption of light by a transparent, colored object.

Since, as shown in Section 2B, the CIE system was derived from experiments on the mixing of colored lights, the results of such mixing can be determined very easily with the aid of the CIE x, y chromaticity diagram. Remembering that here we deal with the illuminant mode of viewing (p. 3), we can specify the color of a light by its chromaticity * and y and its luminance Y (pages 45 and 50). Grassmann (1853) showed that the luminance of any additive mixture of lights is the sum of the luminances of each of them, regardless of the spectral power distributions. Grassmann’s laws, stated in modern terms to apply to the x, y diagram, show that the chromaticities of lights produced by additive mixing lie on the straight line connecting the chromaticities of the primaries used, and show how to calculate them. With three primaries all the colors inside the triangle formed by joining the chromaticities of the primaries can be produced. The reason for the common choice of red, blue, and green as the additive primary colors now becomes clear—they form larger triangles, hence allow more colors to be matched, than do other choices.

One might think that additive mixing would be found in some printing processes, where dots of three different colors are printed on white paper. This is not the case, however, since the colored dots usually overlap to some extent, and a complicated mixture of additive and subtractive mixing (see below) occurs (Yule 1967, Hunt 1975). Color television, however, does operate by additive mixing, as does theater lighting.

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