contrastRatio - Sigma Knowledge base Browser

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 3729-3733
(domain contrastRatio 1 Object)	ComputingBrands.kif 3724-3724	The number 1 argument of contrast ratio is an instance of object
(domain contrastRatio 2 RealNumber)	ComputingBrands.kif 3725-3725	The number 2 argument of contrast ratio is an instance of real number
(instance contrastRatio BinaryPredicate)	ComputingBrands.kif 3723-3723	contrast ratio is an instance of binary predicate

appearance as argument number 2

(format EnglishLanguage contrastRatio "the contrast ratio of %1 is %2")	ComputingBrands.kif 3727-3727
(termFormat EnglishLanguage contrastRatio "contrast ratio")	ComputingBrands.kif 3726-3726

antecedent

(=>
    (and
        (measure ?P1
            (MeasureFn ?N1 Lumen))
        (measure ?P2
            (MeasureFn ?N2 Lumen))
        (part ?P1 ?O)
        (part ?P2 ?O)
        (not
            (equal ?P1 ?P2))
        (greaterThan ?N1 ?N2)
        (equal
            (DivisionFn ?N1 ?N2) ?R)
        (contrastRatio ?O ?R))
    (not
        (exists (?P3 ?P4 ?N3 ?N4)
            (and
                (measure ?P3
                    (MeasureFn ?N3 Lumen))
                (measure ?P4
                    (MeasureFn ?N4 Lumen))
                (part ?P3 ?O)
                (part ?P4 ?O)
                (not
                    (equal ?P3 ?P4))
                (greaterThan ?N3 ?N4)
                (greaterThan
                    (DivisionFn ?N3 ?N4) ?R)))))

ComputingBrands.kif 3735-3756

If the measure of an object is a real number lumen(s) and the measure of another object is another real number lumen(s) and the object is a part of a third object and the other object is a part of the third object and the object is not equal to the other object and the real number is greater than the other real number and the real number and the other real number is equal to a third real number and the contrast ratio of the third object is the third real number,
then there don't exist a fourth object, a fifth object,, , a fourth real number and a fifth real number such that the measure of the fourth object is the fourth real number lumen(s) and the measure of the fifth object is the fifth real number lumen(s) and the fourth object is a part of the third object and the fifth object is a part of the third object and the fourth object is not equal to the fifth object and the fourth real number is greater than the fifth real number and the fourth real number and the fifth real number is greater than the third real number

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