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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This is convenient for certain textile sorting applications and for graphical quality control charting. Auditing Consulting Sourcing Training.

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. For specimens that are matte, randomly rough, or mildly textured, values intermediate between 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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

This is contrary to what is observed. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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 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?



Inspection Validating the specifications, value and safety of your raw materials, products and assets. Current edition approved May 1, Send us a request Need help or e2244 a question?

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.

It was derived primarily from visual observations of automotive paints on steel panels. Ast, color tolerance difference equations which base the distortion of CIELAB space on the position of the standard allows a user to prede?

ASTM D2244

However, for control of color in production, it may be necessary to know not only the ast, of the departure from standard but also d22244 direction of this departure. CIE94 tolerances are computed as follows: 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.

The revision published in omitted these sections, and limited the color spaces and color-difference equations considered, to the three most widely used in the paint and related coatings industry.

Summary of Practice 4. A color difference equation quanti?


Record the location where these measurements were made on the specimen. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Approved May 1, Aastm Practice E Each material and condition of use may require speci?

ASTM D ColorTolerance_百度文库

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.

ASTM D von The are computed using the following equations: This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Colorimetric spectrometers are designed to optimize their use as digital simulations of the visual colorimeter or as the source of spectral and colorimetric information astj computer-assisted color matching systems. The X-Rite i7 Colorimeter is highly automated.

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 sections on apparatus, calibration standards and methods, and measurement procedures served little purpose in the light of modern color-measurement technology.