ASTM D2244-16由美国材料与试验协会 US-ASTM 发布于 2016-07-01。
ASTM D2244-16在国际标准分类中归属于: 17.180.20 颜色和光的测量。
ASTM D2244-16 计算仪器测量颜色的颜色容差和色差的标准实施规程的最新版本是哪一版?
最新版本是 ASTM D2244-23 。
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 ΔECMC 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 Hunter color difference components ΔLH, ΔaH, ΔbH, and their color difference unit ΔEH, 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 ......
假如单纯以一组Lab值来判别某个颜色并没有太大的实际意义,但是当对两个颜色实行对比时,我们可以经过这两个颜色的Lab差值来判别出它们之间的差异。另外,经过两组Lab值可以计算出两颜色间的色差,假如色差大于1咱们的眼睛就可以分辨出。由此我们可以事先设定一定的容差范围,在实行质量管制时,测量的样品与规范颜色之间色差值在容差范围内即为合格品,超出即为不合格产品。...
3.细心观察 由于测量前已经设置了容差,经过测量标样和试样之后,可以通过数据直接看到标样和测样的总色差ΔE,显示屏还会根据ΔE的数值,参照已经设定的容差值,直接判断出测样是否合格,因此,让数据说话,才能做到心中有数。 4.数据删除与存储 测试完成后,测试的色差数据可以整体删除,也还可以通过PC端连接网络,实现产品色差数据的存储与共享。...
分光测色仪被设计用于视觉色度的数据比较和仿真,同时用于计算机配色的重要辅助工具,可以帮助各大生产商完美的完成光谱和色度信息的分析、处理和监控。在分光测色仪的使用中,会涉及到一个关键性的数据方程—色宽容度方程,其实就是我们平时说容差范围,在工业批量生成中有容差来控制产品和合格情况,既快速,又合理。 ...
色差仪可以完美地测量出物体的Lab值并通过分析得出两种颜色的差别。通过长期观察Lab值结果我们会发现当Lab值之间的差值大于1时肉眼就可以明显的感受到色差的存在。一般现在工业上为了节省时间提高生产效率,一般都是采用事先设定一个容差范围,在进行质量控制时,测量的样品只要在容差范围就为合格,否者为不合格。这样不但可以控制产品的颜色质量同时提高效率。通过使用Lab色空间,我们的生产控制实现了数据化。...
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