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In basic colorimetry, after we can specify colors numerically, the next step is to develop metrics to evaluate how closely colored material matches a designated color or standard. Major steps in the color speciï¬cation were taken with the development of the CIE 1931 system. In the over 60-year time span since then, scientists have been working on developing color-difference metrics. At ï¬rst most of the research focused on the determination of just perceptible differences. Later, metrics were expanded to include acceptability, rather than just percepti296 bility. That is, acceptability ellipses are based on what was a commercially acceptable difference, and may be slightly larger than just-perceptible differences. Earlier this year, an article was published on supra-threshold color-difference ellipsoids. Now in this issue, M. R. Pointer and G. G. Attridge are looking at the scaling of even larger color differences. In ââSome Aspects of the Visual Scaling of Large Colour Differences,ââ they report on investigations of the application of four colordifference metrics to visual scaling of large color differCOLOR research and application / 8a12 8A12$$1876 08-19-97 13:09:46 crra W-Color Res 1876 ences between photographically prepared reï¬ection color samples. One of the challenges facing color scientists today in advanced colorimetry
Color Research & Application – Wiley
Published: Oct 1, 1997
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