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By Sutte C.A. (ed.)

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McDonald, R. (1988) Acceptability and perceptibility decisions using the CMC color difference formula. Textile Chemist and Colorist June issue. ) 4. CMC Calculation of Small Color Differences for Acceptability. AA TCC Test Method 173-1989. Textile Chemist and Colorist November 1989. ) 5. The set of green paint chips was provided by Collaborative Testing Services, Inc. 1 Introduction When the original name of the printing process we now know as flexography was changed from aniline printing, many printers believed the name was adopted primarily because the process was so widely used for printing flexible packaging materials.

The eIE recommended, in 1931, the use of the chromaticity coordinates x, y, and z to define a color specification. The chromaticity coordinate is simply the amount of anyone of the tristimulus values divided by the sum of all three. The following relationships define the chromaticity coordinates: X x=---- X+ Y+ Z' Y Z z=---- X+Y+Z Since x + y + z = 1, we only need two coordinates to specify chromaticity. 825 O. O. O. O. O. O. 381 display a color specification. This graph is called the chromaticity diagram.

This development makes it possible to use a single number tolerance for judging the acceptability of a color match. The CMC modification of CIELAB provides a tolerance volume. 17). The volume may be modified based on mutually agreed upon acceptability limits. 0 DEcMC units from the standard becomes the unit of measurement for describing the acceptability of a colored batch. 0 unit CMC will represent a different size and shape ellipsoid for different regions of color space. 18. A commercial factor (CF) can be applied to the CMC tolerance.

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