public static double XYZtoDelta(cXYZ c1, cXYZ c2)
{
cLAB lab1 = XYZtoLAB(c1);
cLAB lab2 = XYZtoLAB(c2);
return(LABtoDelta(lab1, lab2));
}
public static double RGBtoDelta(Color c1, Color c2)
{
cLAB lab1 = RGBtoLAB(c1);
cLAB lab2 = RGBtoLAB(c2);
return(LABtoDelta(lab1, lab2));
}
public static Color LABtoRGB(cLAB LAB)
{
cXYZ xyz = LABtoXYZ(LAB);
Color rgb = XYZtoRGB(xyz);
return(rgb);
}
public static cLAB RGBtoLAB(Color rgb)
{
cXYZ xyz = RGBtoXYZ(rgb.R, rgb.G, rgb.B);
cLAB lab = XYZtoLAB(xyz);
return(lab);
}
public static cLAB RGBtoLAB(int r, int g, int b)
{
cXYZ xyz = RGBtoXYZ(r, g, b);
cLAB lab = XYZtoLAB(xyz);
return(lab);
}
public static double LABtoDelta(cLAB c1, cLAB c2)
{
try
{
double _L = Math.Pow(c1.L - c2.L, 2);
double _a = Math.Pow(c1.a - c2.a, 2);
double _b = Math.Pow(c1.b - c2.b, 2);
double Delta = Math.Sqrt(_L + _a + _b);
return(Delta);
}
catch
{
return(0);
}
}
public static cLAB XYZtoLAB(double X, double Y, double Z)
{
double _X = X / 95.047d;
double _Y = Y / 100d;
double _Z = Z / 108.883d;
_X = _X > 0.008856d ? Math.Pow(_X, (1d / 3d)) : (7.787d * _X) + (16d / 116d);
_Y = _Y > 0.008856d ? Math.Pow(_Y, (1d / 3d)) : (7.787d * _Y) + (16d / 116d);
_Z = _Z > 0.008856d ? Math.Pow(_Z, (1d / 3d)) : (7.787d * _Z) + (16d / 116d);
cLAB lab = new cLAB();
lab.L = (116d * _Y) - 16d; // helderheid 0-100
lab.a = 500d * (_X - _Y); // groen-rood -127 - 127
lab.b = 200d * (_Y - _Z); // blauw-geel -127 - 127
return(lab);
}
public static cXYZ LABtoXYZ(cLAB LAB)
{
cXYZ xyz = LABtoXYZ(LAB.L, LAB.a, LAB.b);
return(xyz);
}
public static cLAB XYZtoLAB(cXYZ XYZ)
{
cLAB lab = XYZtoLAB(XYZ.X, XYZ.Y, XYZ.Z);
return(lab);
}
