{"id":2000,"date":"2013-05-18T20:59:00","date_gmt":"2013-05-19T00:59:00","guid":{"rendered":"https:\/\/sensing.konicaminolta.us\/blogs\/features-of-the-cie-2000-color-difference-formula"},"modified":"2021-07-21T09:17:30","modified_gmt":"2021-07-21T13:17:30","slug":"features-of-the-cie-2000-color-difference-formula","status":"publish","type":"blog","link":"https:\/\/sensing.konicaminolta.us\/us\/blog\/features-of-the-cie-2000-color-difference-formula\/","title":{"rendered":"Features of the CIE 2000 Color Difference Formula"},"content":{"rendered":"<p>The CIE 2000 color difference formula was developed to solve the problem of the differences in the evaluation between color meters and the human eye. The problem is caused by the difference in the shape and size of the <a href=\"https:\/\/sensing.konicaminolta.us\/us\/blog\/defining-color-tolerances\/\">color discrimination threshold of the human eye.<\/a><\/p>\n<p>The CIE 2000 color difference formula is not an attempt to build a color space. Instead, it defines a calculation so that the color difference calculated by <a href=\"https:\/\/sensing.konicaminolta.us\/us\/technologies\/chroma-meters-colorimeters\">color meters<\/a> becomes close to the color discrimination threshold of the human eye on the solid color space of <a href=\"https:\/\/sensing.konicaminolta.us\/us\/blog\/understanding-the-cie-lch-color-space\/\">CIE Lab (L*a*b* color space)<\/a>. Specifically, weight is assigned to the lightness difference \u0394L*, saturation difference \u0394C*, and hue difference \u0394H&#8217; by using weighting coefficients SL, SC, and Sh respectively. These weighting coefficients SL, SC, and Sh include the effects of lightness L*, saturation C*, and hue angle H. Consequently, the calculation incorporates the characteristics of the color discrimination threshold of the human eye on the color space of CIE Lab (L*a*b* color system): 1) Saturation dependency, 2) Hue dependency, and 3) Lightness dependency.<\/p>\n<p>With the <a href=\"https:\/\/sensing.konicaminolta.us\/us\/blog\/identifying-color-differences-using-l-a-b-or-l-c-h-coordinates\/\">CIE Lab (L*a*b* color space) color difference formula<\/a>, the color difference evaluation ranges represented by color difference \u0394E*ab and chromaticity index difference \u0394a*b* were a perfect circle or a square in the L*a*b* solid color space. With CIE 2000, color difference \u0394E00 is represented with an ellipse having the major axis in the direction of saturation similar to the shape of the color discrimination threshold of the eye. In the region with lower saturation, the weighting coefficients SL, SC, and Sh approach 1 respectively, making the ellipse more circular.<\/p>\n<p>In the region with higher saturation, the weighting coefficient SC becomes greater compared with other coefficients SL and Sh so that the ellipse becomes longer in the direction of saturation (lower sensitivity to saturation differences).<\/p>\n<p>With the CIE 2000 color difference formula, the effect on the hue angle is also considered. As a result, the formula can cope with another characteristic of the color discrimination threshold of the human eye on the color space of CIE Lab (L*a*b* color space): 4) Change in the direction of the color discrimination threshold around the hue angle of 270 degrees (blue) (deviation from the direction of saturation).<\/p>\n","protected":false},"featured_media":980,"template":"","learning_center_categories":[237],"class_list":["post-2000","blog","type-blog","status-publish","has-post-thumbnail","hentry","learning_center_categories-color-appearance-measurement"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.4 (Yoast SEO v24.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Features of the CIE 2000 Color Difference Formula<\/title>\r\n<meta name=\"description\" content=\"The CIE 2000 color difference formula was developed to solve the problem of the differences in the evaluation between color meters and the human eye.\" 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