Color Vision and Colorimetry: Theory and Applications by Daniel Malacara

By Daniel Malacara

This moment variation has been rewritten, up to date, and enlarged, describing the fundamental ideas of colour imaginative and prescient and colorimetry. The background of colour is defined, in addition to the most tools used to degree colour and their linked colour platforms, and the human eye and its colour detectors are defined with a few aspect. The booklet has been written with scholars in an introductory colour direction in brain, yet those that have adventure within the box also will enjoy the compendium of knowledge inside.

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Extra resources for Color Vision and Colorimetry: Theory and Applications

Sample text

II, Optical Society of America, Washington, DC (2010). 1 Introduction The perceived color of an illuminated object depends not only on its intrinsic color or spectral reflectivity, but also on the power spectrum of the light source. In this chapter, we will study some of the most important light sources used in colorimetric studies. General descriptions of light sources can be found in many publications (Elenbaas, 1972; Eby and Levin, 1979; Malacara and Morales, 1988; LaRocca, 1995; IESNA, 2000).

5 illustrates the typical spectra of the light produced by a flashlamp with xenon and with krypton. A fluorescent lamp is glass tube filled with low-pressure mercury vapor and argon, xenon, neon, or krypton. The inner surface of the tube is coated with a fluorescent powder, which is a blend of metallic and rare-earth phosphor salts. When the ultraviolet light emitted by the mercury vapor hits the fluorescent powder, this energy is converted to visible light with a continuous spectrum. The color of this emitted visible light can be chosen with the proper selection of the fluorescent powder.

This characteristic is especially useful for the transmission of information in a pulse-coded light beam. Another common application that benefits from this characteristic is in image displays. Lifetime: LEDs have long useful lives—as high as 50,000 hours. Disadvantages (a) Price: The price of LEDs is relatively high as compared with other light sources, but it is constantly decreasing. (b) Voltage sensitivity: LEDs must have a power supply with a lower tolerance in voltage and current than other light sources.

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