The application defined in the ASTM D2244 standard developed by the American Society for Testing and Materials (ASTM) includes the calculation of color tolerances and minor color differences between opaque samples such as painted panels, plastic plates or textile samples from instrumentally measured color coordinates based on daylight illumination.
If it is suspected that samples are metameric, that is, they have different spectral curves despite being visually the same color, the ASTM D4086 standard should be used to validate instrumental results (ASTM D4086-92a standard practice for visual assessment of metamerism).
The tolerances and differences determined by the procedures described in this standard, whose full name is "ASTM D2244-21 Standard practice for calculating color tolerances and color differences from color coordinates measured with an instrument", are expressed in terms of approximately uniform visual color perception as follows:
For product specification, buyer and seller must agree on the allowable color tolerance and procedure for calculating color tolerance between test sample and reference. Each material and usage condition may require certain color tolerances because other appearance factors (such as sample affinity, gloss, and texture) can affect the correlation between the magnitude of a measured color difference and its commercial acceptability.
For the purposes of this standard, a colorimetric spectrometer is a dispersive element capable of producing a component (such as a prism, grating or interference filter or wedge or series of tunable or discrete monochromatic sources) normally as output colorimetric data (for example, tristimulus values and derived color coordinates or as indices of appearance attributes) refers to a spectrometer. The colorimetric spectrometer can also report the basic spectral data from which the colorimetric data is derived.
Our organization provides standard testing services for calculating color tolerances and color differences from color coordinates measured with tools, within the scope of ASTM D2244-21 standard, with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors. also gives.
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