图片
地址:江苏省南京市建邺区江东中路118号德盈大厦1622
电话:025-8658 3475
传真:025-8658 3457
网址:http://www.en45545-2.com/
邮箱:info@fire-test.com
文章正文
ASTM D2244 Calculation of Color Tolerances and Color Differences
作者:admin    发布于:2022-12-06 14:28:40    文字:【】【】【
摘要:ASTM D2244 Calculation of Color Tolerances and Color Differences,ASTM D2244是用于计算仪器测量的色坐标的色差的标准测试方法。测量样品颜色,结果可以用L,a,b或x,y,z标度表示。该测试方法通常与UV测试相关的其他加速老化测试方法结合使用,例如ASTM G155,ASTM G154,ASTM F1515和许多其他材料测试方法。具体内容请咨询南京睿督公司,咨询电话:025-8658 3475。

ASTM D2244 Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

ASTM D2244 is a standard test method for calculating color differences from instrumentally measured color coordinates. The sample color is measured and the results can be expressed on the L, a, b or x, y, z scales.  This test method is often used in conjunction with additional accelerated aging test methods related to UV testing such as  ASTM G155, ASTM G154, ASTM F1515 and many other material testing methods. Micom Laboratories offers the ASTM D2244 test as part of paint and coating testing services.Color measurements are often required with other appearance factors such as gloss (tested using the ASTM D523 standard), haze, distinctness of image (DOI) and reflected image quality.  Indeed the sample texture, may affect the correlation between the magnitude of a measured color difference and its commercial acceptability.

Use and factors to be considered

The color difference between a reference and an aged test specimen, as measured using  the ASTM D2244 test, are determined using a colorimeter. Typically two color scales are used for color measurement: tristimulus X, Y, Z or the L, a, b scale.  Color differences among specimens should be compared only when they were measured on the same color scale system.

A simplified approach for gaging color shifts uses “Delta E”:

Generally speaking the human eye can perceive a Delta “E” greater than or equal to 2.3.  However, for quality control purposes, it is necessary to know not only the magnitude of the departure from standard, but also the direction of this departure. Information on the direction of a color difference is easily included by giving the three instrumentally determined components of the color difference.

Typical Experimental parameters
ASTM D2244 method does not cover preparation techniques. However, generally speaking, samples should be clean, dry and free of deposits. At the minimum, we need a flat, homogeneous area, the size of a nickel.

The following video is about the ASTM D523 Specular Gloss & ASTM D2244 Color Difference Calculation tests. The ASTM D523 measures the capacity of a surface to reflect light while the ASTM D2244 calculates the color tolerances and small colours differences between opaque surfaces.

Tel:+86 400-603-6575   +86 25-8658 3475
Website:www.fire-test.cn   www.fire-test.com  
Email:info@fire-test.com

……



图片
版权所有 Copyright(C)2012-2015 南京睿督科技有限公司 苏公网安备 32010502010102号 苏ICP备12030029号-5
电话:025-8658 3475  传真:025-8658 3457  网址:http://www.en45545-2.com/   邮箱:info@fire-test.com