Posted on July 6, 2019

ASTM D2244 PDF

Color Analysis – CIE94 (ASTM E with ASTM D). Color Analysis – Hunter (ASTM E & ASTM D). Scope: Hunter Lab and XYZ are standard . This standard is issued under the fixed designation D ; the number 1 This practice is under the jurisdiction of ASTM Committee E12 on Color and. ASTM D Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates.

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Color Analysis – CIE94 (ASTM E with ASTM D)

Visually, there is no change in the magnitude of the difference between the specimens simply by switching roles. Thus computed color differences are based only on the Euclidean distance in the DIN99 space. The sections on apparatus, calibration standards and methods, and measurement procedures served little purpose in the light of modern color-measurement technology. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

The most common values are 2: Nor is it possible or reasonable to plot groups of colors in terms of the modi? The three tolerance equations given here have been tested extensively asfm such data for textiles and plastics and have been shown to agree with the visual evaluations to within the astmm uncertainty of the visual judgments. 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.

A number in parentheses indicates the year of last reapproval. A color difference equation quanti?

The CIELAB metric, with its associated color-difference equation, has found wide acceptance in the coatings, plastics, textiles and related industries. See Practice E Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.

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Specular component included for integrating-sphere measurements. 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.

ASTM D2244

For specimens that are matte, randomly rough, or mildly textured, values intermediate between 1: Send us a request Need help or have a question? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Whether your business is local or global, we can ensure your products meet quality, health, environmental, safety, and social accountability standards for virtually any market around the world.

Consequently, color differences are seldom if ever computed directly from differences in x, y, and Y. In the process, the researchers came to the conclusion that neither formula was truly optimum. 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.

Lightness L99 5 This standard has been approved for use by agencies of the Department of Defense. Thus the equation is highly optimized for pairwise comparison of a product standard to a production test specimen but not for statistical process control. Because of the many trigonometric functions and power functions involved in computing the color space parameters, all computations should be carried out in IEEE?

Additionally, the colorimetric spectrometer may also be able to report the underlying spectral data from which the colorimetric data were derived. Color-difference units are computed, from these color-scale values, and approximate the perceived color differences d22244 the reference and the test specimen. Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.

ASTM D – COLOR DETERMINATION

Formally confirming that your products and services meet all trusted external and internal standards. Qstm avoid confusion, color differences among specimens or the associated tolerances should be compared only when they are obtained for the same color-scale system.

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This method of computing a metric hue difference loses the information about the sign of the hue difference positive or negative and can be unstable for pairs of colors near the neutral axis. It is intended to be used as a single-number shade-passing equation. The CIELAB color-difference equation is also not recommended in this practice for use in describing small and moderate color differences differences with magnitude less aatm 5. It is the responsibility of the user of d224 standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

Under these conditions, Xn, Yn, Zn are asfm tristimulus values of the standard illuminant with Yn equal to Link to Active This link will v2244 route to the current Active version of the standard. All the k values default to 1 in the absence of speci? Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. Its weighting functions are much simpler than those of the CMC equation.

Visual color and spectrophotometer readings can also be affected by surface texture, molding atsm, processing method, and viewing light sources. Originally approved in 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. Current edition approved May 1, Precision and Bias CIE94 tolerances are computed as follows: Assurance Testing Inspection Certification.

Good correlation with the visual judgments may not be obtained when the calculations ast made with other illuminants. Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Inter-changing the reference and test specimens does not change either the perceived or predicted color differences.