本文件规定了计算已知光谱分布颜色刺激三刺激值的方法,这些颜色刺激能够由自发光的光源或由反射或透射的物体产生。本文件规定了至少在380 nm~780 nm的波长范围内,以不超过5 nm的测量间隔将颜色刺激函数制成表格。对于波长测量范围小于380 nm~780 nm的情形,建议采用外推法。本文件给出了在360 nm~830 nm的波长范围内,以1 nm为间隔进行求和的标准方法。对更大的波长间隔(最大至5 nm)和更短的波长范围(短至380 nm~780 nm),定义了备选的简化方法。只有在适当情况下,并在用户审查了对最终结果的影响后,才使用备选方法。本文件适用于色度计算、色度测量仪器设计、制造和色度测量相关应用领域。本文件可以与CIE 1931标准色度观察者或CIE 1964标准色度观察者配合使用。
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本文件规定了一种计算CIE 1976 L*a*b*颜色空间坐标明度、彩度和色调相关量的方法,它包括两种在颜色空间中表示颜色感知差异的欧氏几何距离的计算方法。本文件适用于使用色匹配函数计算三刺激值的CIE 1931标准色度系统或CIE 1964标准色度系统。本文件可用于描述反射或透射物体的颜色特性,在这种情况下,需要一个比三刺激颜色空间更均匀的三维颜色空间。本文件适用于自发光显示器,如阴极射线管,如果它们被用于模拟反射或透射物体的颜色刺激,并且颜色刺激已适当归一化。本文件不适用于主要由光源自身发光的区域或者镜面反射该发光区域的颜色刺激。附录A中给出了逆向变换计算的方法。
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5.1 The CIE colorimetric systems provide numerical specifications that are meant to indicate whether or not pairs of color stimuli match when viewed by a CIE standard observer. The CIE color systems are not intended to provide visually uniform scales of color difference or to describe visually perceived color appearances.5.2 This practice provides for the calculation of tristimulus values X, Y, Z and chromaticity coordinates x, y that can be used directly for psychophysical color stimulus specification or that can be transformed to nearly visually uniform color scales, such as CIELAB and CIELUV. Uniform color scales are preferred for research, production control, color-difference calculation, color specification, and setting color tolerances. The appearance of a material or an object is not completely specified by the numerical evaluation of its psychophysical color, because appearance can be influenced by other properties such as gloss or texture.1.1 This practice provides the values and practical computation procedures needed to obtain CIE tristimulus values from spectral reflectance, transmittance, or radiance data for object-color specimens.1.2 Procedures and tables of standard values are given for computing from spectral measurements the CIE tristimulus values X, Y, Z, and chromaticity coordinates x, y for the CIE 1931 standard observer and X10, Y10, Z10 and x10. y10 for the CIE 1964 supplementary standard observer.1.3 Standard values are included for the spectral power of six CIE standard illuminants and three CIE recommended fluorescent illuminants. Weight sets are included for tristimulus integration of nine standard or recommended CIE LED illuminants combined with the two standard CIE observers.1.4 Procedures are included for cases in which data are available only in more limited wavelength ranges than those recommended, or for a measurement interval wider than that recommended by the CIE. This practice is applicable to spectral data obtained in accordance with Practice E1164 with 1-, 5-, 10-, or 20-nm measurement interval.1.5 This practice includes procedures for conversion of results to color spaces that are part of the CIE system, such as CIELAB and CIELUV (3). Equations for calculating color differences in these and other systems are given in Practice D2244.1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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