ASTM D ASTM D von ASTM Db. ASTM D A number in parentheses indicates the year of last reapproval.
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Some rush fees may apply. Add to Cart. View Full Details and Buy. Complementary Documents and Links:. This practice covers the calculation, from instrumentally measured color coordinates based on daylight illumination, of color tolerances and small color differences between opaque specimens such as painted panels, plastic plaques, or textile swatches. Where it is suspected that the specimens may be metameric, that is, possess different spectral curves though visually alike in color, Practice D should be used to verify instrumental results.
For product specification, the purchaser and the seller shall agree upon the permissible color tolerance between test specimen and reference and the procedure for calculating the color tolerance. Each material and condition of use may require specific color tolerances because other appearance factors, for example, specimen proximity, gloss, and texture , may affect the correlation between the magnitude of a measured color difference and its commercial acceptability.
This standard does not purport to address all of the safety concerns, if any, associated with its use. 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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ASTM D 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. Indeed the sample texture, may affect the correlation between the magnitude of a measured color difference and its commercial acceptability. 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. 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.
Color Analysis (ASTM E1347 with ASTM D2244)
Historical Version s - view previous versions of standard. More E 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.
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