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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ASTM D von Through our network of over 43, people in 1, laboratories and offices in countries, V2244 provides quality and safety solutions to a wide range of industries around the world. 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

The color dependent functions are de? See Practice E 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. A previous revision added two new color tolerance equations and put two of the color difference equations from the version in an informative appendix for historical purposes.

Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. Hunter Lab and XYZ are standard three dimensional color spaces that allows a precise definition of the color of a test sample.

It is intended to be used as a single-number shade-passing equation. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Color analysis can be used to match adjacent parts molded from different materials, or to evaluate color change due to outdoor exposure. Visual color and spectrophotometer readings can also be affected by surface texture, molding parameters, processing method, and viewing light sources.

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Visually, there is no change in the magnitude of the difference between the specimens simply by switching roles. Examples of Ka and Kb are tabulated in Table X1. Need help or have a e2244

Both are appropriate for and widely used in industrial and commercial applications including, but d2244 limited to, automobiles, coatings, cosmetics, inks, packaging, paints, plastics, printing, security, and textiles. The four color space terms are computed as follows: Where it is suspected that the specimens may be metameric, that is, possess different asgm curves though visually alike in color, Practice D should be used to verify instrumental results.

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.

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. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

ASTM D ColorTolerance_百度文库

Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. The equations derived and documented in standard DIN provides an axes rotation and the logarithmic expansion of the new axes to match that of the spacing of the CIE94 color tolerance formula without the need to make the specimen identi?

In a typical recent survey Report No.

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. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

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Inter-changing the reference and test specimens does not change either the perceived or predicted color differences. Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.

Color Analysis – CIE94 (ASTM E1347 with ASTM D2244)

Nor is it possible or reasonable to plot groups of colors in terms aetm the modi? Approved May 1, Because of the many trigonometric functions and power functions involved in computing the color space parameters, all computations should be carried out in IEEE? Each subsequent color scale based on CIE values has 2 6.

Link to Active This link will always route to the current Active version of the standard. Last previous edition approved in as D — That implies that the equations themselves misclassify a color difference with a frequency no greater than that of the most experienced visual color matcher.

Formally confirming that your products and services meet all trusted external and internal standards. Consequently, color differences are seldom if ever computed directly from differences in x, y, and Y. After specifying the illuminant, observer angle, and the reference color, the test sample is inserted into the specimen holder and the spectrophotometer takes the reading.

Record the location where these measurements were made on the specimen. Under these conditions, Xn, Yn, Zn are the tristimulus values of the standard illuminant with Yn equal to