Colorimetry: Fundamentals and Applications (The Wiley-IS&T by Noboru Ohta, Alan Robertson

By Noboru Ohta, Alan Robertson

Colorimetry, the technological know-how of quantitvely describing colour, is key for colour replica expertise. the reason is, it creates criteria through which to degree colour, utilizing mathematical recommendations and software program to make sure constancy throughout media, enable actual colour blending, and to increase colour optimization.This publication is a complete and thorough creation to colorimetry, taking the reader from simple options via to a number of commercial purposes. Set out in transparent, easy-to-follow terminology, Ohta and Robertson clarify primary rules resembling colour specification, the CIE (International fee on Illumination) process, and colour imaginative and prescient and visual appeal versions. additionally they hide the subsequent topics:the optimization of colour reproduction;uniform colour areas and colour distinction formulae, together with the CIEDE 2000 formula;applications of metamerism, chromatic version, colour visual appeal and colour rendering;mathematical formulae for calculating colour blending, maximising luminous efficacy, and designing illuminants with particular properties.Colorimetry: basics and functions is a perfect reference for working towards colour engineers, colour scientists and imaging pros engaged on colour structures. it's also a realistic advisor for senior undergraduate and graduate scholars who are looking to collect wisdom within the box.

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A light having a wavelength of 650 nm or longer is red-colored if it can be seen at all. No colorless region is present for these wavelengths. This is one of the reasons why a red light is used in important cases such as traffic signals. Although the spectral responsivity of cones differs somewhat from that of rods, they both have a maximum in the middle of the visible wavelength region. With recent progress in artificial illumination, activity at night can be carried out without any problem. 13 Spectral responsivity of cones and rods obtained from threshold measurements (Wald 1945).

14 Spectral distribution of daylight (solid line) and spectral sensitivity (broken lines) of cones (right) and rods (left) (Ikeda 1975b). Reproduced by permission of Asuara Shoten and, historically, human activity has taken place principally under daylight. Presumably, the evolution of the spectral responsivity of the human eye occurred so as to fully and efficiently utilize daylight. 14 shows the spectral distribution of daylight and the spectral responsivity of rods and cones, and it can be seen that the maximum responsivities occur at a wavelengths roughly corresponding to those at which the radiant energy of daylight is at its maximum (Ikeda 1975a,b).

Thus, Km , the maximum luminous efficacy of radiation for photopic vision is 683 lm/W. 1. 40175 = 1700 lm/W. This maximum occurs at m = 507 nm. 15b. 21 Spectral luminous efficacyK scotopic vision respectively 700 and K for photopic and vision. Accordingly, the following explanation is given using the symbols for photopic vision. In the above description, only monochromatic light is treated. However, in daily life, monochromatic light is rare, and, in general, polychromatic light, such as sunlight or light emitted from an artifical lamp with a continuous or partly continuous polychromatic spectrum, is used.

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