public void ComputeDifference(double a1,
double a2,
double a3,
double b1,
double b2,
double b3,
double expectedDeltaE)
{
// arrange
var x = new RGBColor(in a1, in a2, in a3);
var y = new RGBColor(in b1, in b2, in b3);
// act
var deltaE = new EuclideanDistanceColorDifference <RGBColor>().ComputeDifference(in x, in y);
// assert
Assert.Equal(expectedDeltaE, deltaE, DoubleComparerLabRounding);
}
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);
}
}