ASTM D2244-14
用​仪​器​测​定​颜​色​坐​标​的​方​法​计​算​色​差​的​标准实施规程

Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

被代替

非常抱歉，我们暂时无法提供预览，您可以试试： 免费下载 ASTM D2244-14 前三页，或者稍后再访问。

您也可以尝试购买此标准，
点击右侧 “立即购买” 按钮开始采购（由第三方提供）。

标准号

ASTM D2244-14

发布

2014年

发布单位

美国材料与试验协会

替代标准

ASTM D2244-15

当前最新

ASTM D2244-23

 

 

适用范围

5.1 The original CIE color scales based on tristimulus values X, Y, Z and chromaticity coordinates x, y are not uniform visually. Each subsequent color scale based on CIE values has had weighting factors applied to provide some degree of uniformity so that color differences in various regions of color space will be more nearly comparable. On the other hand, color differences obtained for the same specimens evaluated in different color-scale systems are not likely to be identical. To avoid confusion, color differences among specimens or the associated tolerances should be compared only when they are obtained for the same color-scale system. There is no simple factor that can be used to convert accurately color differences or color tolerances in one system to difference or tolerance units in another system for all colors of specimens.

5.2 Color differences calculated in ΔE_CMC or ΔE₀₀ units are highly recommended for use with color-differences in the range of 0.0 to 5.0 ΔE*_ab units. Both are appropriate for and widely used in industrial and commercial applications including, but not limited to, automobiles, coatings, cosmetics, inks, packaging, paints, plastics, printing, security, and textiles. The CIELAB color-difference unit ΔE*_ab is not recommended for use with color differences less than 5.0 ΔE*_ab units. The Hunter color difference components ΔL_H, Δa_H, Δb_H, and their color difference unit ΔE_H, are used by the coil coating and aluminum extrusion coating industries, as well as the customers of these users. They are, therefore, included in Appendix X1 for historical purposes and use.

5.3 Users of color tolerance equations have found that, in each system, summation of three, vector color-difference components into a single scalar value is very useful for determining whether a specimen color is within a specified tolerance from a standard. However, for control of color in production, it may be necessary to know not only the magnitude of the departure from standard but also the direction of this departure. It is possible to include information on the direction of a small color difference by listing the three instrumentally determined components of the color difference.

5.4 Selection of color tolerances based on instrumental values should be carefully correlated with a visual appraisal of the acceptability of differences in hue, lightness, and saturation obtained by using Practice D1729. The three tolerance equations given here have been tested extensively against such data for textiles and plastics and have been shown to agree with the visual evaluations to within the experimental uncertainty of the visual judgments. That implies that the equations themselves misclassify a color difference with a frequency no greater than that of the most experienced visual color matcher.

5.5 While color differen......

ASTM D2244-14相似标准

推荐

谁引用了ASTM D2244-14 更多引用