Standard Test Method for Color and Color-Difference Measurement by Tristimulus Colorimetry

Importancia y uso:

5.1 The most direct and accessible methods for obtaining the color differences and color coordinates of object colors are by instrumental measurement using colorimeters or spectrophotometers with either hemispherical or bidirectional optical measuring systems. This test method provides procedures for such measurement by use of a colorimeter with either a bidirectional or a hemispherical optical measuring system.

5.2 This test method is suitable for measurement of color differences of nonmetameric, nonparameric pairs of object-color specimens, or color coordinates of most such specimens. A further limitation to the use of colorimeters having hemispherical geometry is the existence of a chromatic integrating-sphere error that prevents accurate measurement of color coordinates when the colorimeter is standardized by use of a white standard.4

5.3 For the measurement of retroreflective specimens by this test method, the use of bidirectional geometry is recommended (see Guide E179 and Practice E805).

Note 3: To ensure inter-instrument agreement in the measurement of retroreflective specimens, significantly tighter tolerances than those given in Practice E1164 in the section on Influx and Efflux Conditions for 45°:Normal (45:0) and Normal:45° (0:45) Reflectance Factor are required for the instrument angles of illumination and viewing. Information on the required tolerances is being developed.

5.4 A requirement for the use of a colorimeter to obtain accurate color coordinates is that the combination of source, filter, and detector characteristics to duplicate accurately the combined characteristics of a CIE standard illuminant and observer. When this requirement is not met, this test method requires the use of local standards for improving accuracy in the measurement of color coordinates (see also 4.2). For the measurement of small color differences between nonmetameric, nonparameric specimens, accuracy in absolute color coordinates is less important and standardization of the colorimeter by use of a white standard is satisfactory. However, accurate color-difference measurement requires that specimen pairs have similar spectral and geometric characteristics.

Subcomité:

E12.02

Referida por:

D4214-23, D4956-19, D3258-04R19, D7489-09R17, D7195-21, D3451-24, D2805-11R23, D5150-92R17, D6531-24, D5215-93R21, D6441-05R24, D2457-21, D1014-18, D4303-10R22, D0822-23, D7073-20, D2066-07R20, D3450-15R20, C0309-19, E0313-20, E0430-23, D4587-23, D8584-24, C0309-19, E1349-06R22, D5531-17R23, D2205-20, D3206-23, D4960-20, D0868-21, E1477-98AR22, E0805-22, D6290-19, D5031-23, D1746-23, C0171-20, D4214-23, D6578_D6578M-13R18, D3361_D3361M-22, E0313-20, D5548-13R20, D5382-02R17, D5326-22, C1315-19, D4397-16R23, D6695-24, D6131-17R23, D3730-17R22, D6763-16R22, D6290-19, D6290-19, D6290-19, D5324-16R22, D5146-10R19

Volúmen:

06.01

Número ICS:

17.180.20 (Colours and measurement of light)

Palabras clave:

bidirectional geometry; color; color difference; colorimeter; filter colorimeter; integrating sphere; tristimulus filter colorimeter;