By Noboru Ohta, Alan Robertson
Colorimetry, the technological know-how of quantitvely describing colour, is vital for colour replica know-how. for the reason that it creates criteria in which to degree colour, utilizing mathematical options and software program to make sure constancy throughout media, permit actual colour blending, and to increase colour optimization.This e-book is a complete and thorough creation to colorimetry, taking the reader from simple ideas via to various business functions. Set out in transparent, easy-to-follow terminology, Ohta and Robertson clarify primary rules akin to colour specification, the CIE (International fee on Illumination) method, and colour imaginative and prescient and visual appeal versions. additionally they conceal the next topics:the optimization of colour reproduction;uniform colour areas and colour distinction formulae, together with the CIEDE 2000 formula;applications of metamerism, chromatic edition, 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 training colour engineers, colour scientists and imaging pros engaged on colour platforms. it's also a pragmatic consultant for senior undergraduate and graduate scholars who are looking to gather wisdom within the box.
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Additional resources for Colorimetry: Fundamentals and Applications (The Wiley-IS&T Series in Imaging Science and Technology)
13 Spectral responsivity of cones and rods obtained from threshold measurements (Wald 1945). Reprinted with permission from Human vision and the spectrum, Science 101. 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.
Rhodopsin (from rhodon, the Greek word for rose) is the visual pigment that is present in the rods, and is different from iodopsin (from iodos, the Greek word for violet), the visual pigment present in cones. However, both are based on 11-cis-retinal combined with a protein (opsin). More specifically, the retina contains 4 types of visual pigment, all based on 11-cis-retinal, but each having a different opsin; one type is present in the rods, and the other three types are present in the cones. 12.
13 two curves are shown that define three regions I, II, and III. Region I corresponds to color vision in which the cones work to sense light and color. Region II is a colorless region in which only light is sensed but not color. In this region, only the rods function. Nothing is sensed in region III because it is below the threshold value for both cones and rods. 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.