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Sigma KEE - contrastRatio

appearance as argument number 1

(documentation contrastRatio EnglishLanguage "The contrast ratio is a property of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing. A high contrast ratio is a desired aspect of any display. It has similarities with dynamic range. (from Wikipedia)") ComputingBrands.kif 3704-3708
(domain contrastRatio 1 Object) ComputingBrands.kif 3699-3699 domain contrastRatio, 1 and Object
(domain contrastRatio 2 RationalNumber) ComputingBrands.kif 3700-3700 domain contrastRatio, 2 and RationalNumber
(instance contrastRatio BinaryPredicate) ComputingBrands.kif 3698-3698 instance contrastRatio and BinaryPredicate

appearance as argument number 2

(format EnglishLanguage contrastRatio "the contrast ratio of %1 is %2") ComputingBrands.kif 3702-3702
(termFormat EnglishLanguage contrastRatio "contrast ratio") ComputingBrands.kif 3701-3701


        (measure ?P1
            (MeasureFn ?N1 Lumen))
        (measure ?P2
            (MeasureFn ?N2 Lumen))
        (part ?P1 ?O)
        (part ?P2 ?O)
            (equal ?P1 ?P2))
        (greaterThan ?N1 ?N2)
            (DivisionFn ?N1 ?N2) ?R)
        (contrastRatio ?O ?R))
        (exists (?P3 ?P4 ?N3 ?N4)
                (measure ?P3
                    (MeasureFn ?N3 Lumen))
                (measure ?P4
                    (MeasureFn ?N4 Lumen))
                (part ?P3 ?O)
                (part ?P4 ?O)
                    (equal ?P3 ?P4))
                (greaterThan ?N3 ?N4)
                    (DivisionFn ?N3 ?N4) ?R)))))
ComputingBrands.kif 3710-3729

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