CIFilter.labDeltaE issue

CIFilter.labDeltaE issue

CIFilter.labDeltaE shows big difference in color when actual color difference is less than 2%

There are two examples in PerceptualDifferencesTest:

1. testLargeDeltaEvenColorDifferenceIsLessThen2Percent
2. testLargeDifferenceEvenWhenColorHasNoDifference

testLargeDeltaEvenColorDifferenceIsLessThen2Percent

CIFilter.labDeltaE produces outputImage with max difference in color (255) for almost same image inputs.

testLargeDifferenceEvenWhenColorHasNoDifference

CIFilter.labDeltaE produces outputImage with 99 difference in color for same image inputs.