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To quantify the extent to which two colors differ, one calculates CIELAB Delta E (E), the Euclidian distance between two color values in the three-dimensional CIELAB color space, defined as:
Radio ads extolled the benefits of one brand over another, and big, colorful magazines of the 60s were loaded with full-page ads
Another group was shown a milder version of the advertisement
Journal of Head Trauma Rehabilitation, 12 (5), 57-71
Notices on the price adjustments were swiftly posted in some convenience stores
Although yellow particles are present, there are no more than a quarter of them
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