public void CMCColorDifference(double l1, double a1, double b1, double l2, double a2, double b2, double expectedDeltaE_imperceptibility, double expectedDeltaE_acceptability)
{
// arrange
var x = new LabColor(l1, a1, b1);
var y = new LabColor(l2, a2, b2);
// act
var deltaE_imperceptibility = new CMCColorDifference(CMCColorDifferenceThreshold.Imperceptibility).ComputeDifference(x, y);
var deltaE_acceptability = new CMCColorDifference(CMCColorDifferenceThreshold.Acceptability).ComputeDifference(x, y);
// assert
Assert.Equal(deltaE_imperceptibility, expectedDeltaE_imperceptibility, DoubleComparerLabPrecision);
Assert.Equal(deltaE_acceptability, expectedDeltaE_acceptability, DoubleComparerLabPrecision);
}
public void ComputingColorDifference()
{
// CIE Delta-E 1976
{
var differenceCalculator = new CIE76ColorDifference();
var labColor1 = new LabColor(55, 80, 50);
var labColor2 = new LabColor(18, 36, -60);
var difference = differenceCalculator.ComputeDifference(in labColor1, in labColor2); // 124.1169
Assert.Equal(124.11688039908189, difference);
}
// CMC l:c 1984
{
var differenceThreshold = CMCColorDifferenceThreshold.Acceptability; // or "Imperceptibility"
var differenceCalculator = new CMCColorDifference(differenceThreshold);
var labColor1 = new LabColor(55, 80, 50);
var labColor2 = new LabColor(18, 36, -60);
var difference = differenceCalculator.ComputeDifference(in labColor1, in labColor2); // 69.7388
Assert.Equal(69.7387994508022, difference);
}
// CIE Delta-E 1994
{
var application = CIE94ColorDifferenceApplication.GraphicArts; // or "Textiles"
var differenceCalculator = new CIE94ColorDifference(application);
var labColor1 = new LabColor(55, 80, 50);
var labColor2 = new LabColor(18, 36, -60);
var difference = differenceCalculator.ComputeDifference(in labColor1, in labColor2); // 60.7882
Assert.Equal(60.78823549707133, difference);
}
// CIE Delta-E 2000
{
var differenceCalculator = new CIEDE2000ColorDifference();
var labColor1 = new LabColor(55, 80, 50);
var labColor2 = new LabColor(18, 36, -60);
var difference = differenceCalculator.ComputeDifference(in labColor1, in labColor2); // 52.2320
Assert.Equal(52.23202852556586, difference);
}
// Delta Ez
{
var differenceCalculator = new JzCzhzDEzColorDifference();
var color1 = new JzCzhzColor(0.3, 0.4, 165);
var color2 = new JzCzhzColor(0.8, 0.6, 25);
var difference = differenceCalculator.ComputeDifference(in color1, in color2); // 1.0666
Assert.Equal(1.066630832433185, difference);
}
// Euclidean distance
{
// example for euclidean distance in the XYZ color space
var differenceCalculator = new EuclideanDistanceColorDifference <XYZColor>();
var color1 = new XYZColor(0.5, 0.5, 0.5);
var color2 = new XYZColor(0.2, 0.4, 0.6);
var difference = differenceCalculator.ComputeDifference(in color1, in color2); // 0.3317
Assert.Equal(0.33166247903553997, difference);
}
}
public void CMCColorDifference(double l1, double a1, double b1, double l2, double a2, double b2, double expectedDeltaE_imperceptibility, double expectedDeltaE_acceptability)
{
// arrange
var x = new LabColor(l1, a1, b1);
var y = new LabColor(l2, a2, b2);
// act
double deltaE_imperceptibility = new CMCColorDifference(CMCColorDifferenceThreshold.Imperceptibility).ComputeDifference(x, y);
double deltaE_acceptability = new CMCColorDifference(CMCColorDifferenceThreshold.Acceptability).ComputeDifference(x, y);
// assert
Assert.That(deltaE_imperceptibility, Is.EqualTo(expectedDeltaE_imperceptibility).Using(DoubleComparerLabPrecision));
Assert.That(deltaE_acceptability, Is.EqualTo(expectedDeltaE_acceptability).Using(DoubleComparerLabPrecision));
}