/// <summary>
/// Transforms this UnityEngine.Color into CIEColor.CIE_XYZColor.
/// </summary>
/// <returns>The CIE XYZ value of the Color.</returns>
public static CIE_XYZColor ToCIE_XYZ(this Color color)
{
//Ecuations: http://www.brucelindbloom.com/
CIE_XYZColor cieXyz = new CIE_XYZColor();
//Inverse companding
float auxR = color.r <= 0.04045f ? color.r / 12.92f : Mathf.Pow((color.r + 0.055f) / 1.055f, 2.4f);
float auxG = color.g <= 0.04045f ? color.g / 12.92f : Mathf.Pow((color.g + 0.055f) / 1.055f, 2.4f);
float auxB = color.b <= 0.04045f ? color.b / 12.92f : Mathf.Pow((color.b + 0.055f) / 1.055f, 2.4f);
//Linear RGB to XYZ
float[][] transformationMatrix =
{
new float[] { 0.4124564f, 0.3575761f, 0.1804375f },
new float[] { 0.2126729f, 0.7151522f, 0.0721750f },
new float[] { 0.0193339f, 0.1191920f, 0.9503041f }
};
float[][] rgbMatrix =
{
new float[] { auxR },
new float[] { auxG },
new float[] { auxB }
};
float[][] cieXyzMatrix = MathMatrix.MatrixMultiplication(transformationMatrix, rgbMatrix);
cieXyz._x = cieXyzMatrix[0][0];
cieXyz._y = cieXyzMatrix[1][0];
cieXyz._z = cieXyzMatrix[2][0];
return(cieXyz);
}
/// <summary>
/// Transforms this UnityEngine.Color into CIEColor.CIELabColor.
/// </summary>
/// <returns>The CIE Lab value of the Color.</returns>
public static CIELabColor ToCIELab(this Color color)
{
//Ecuations: http://www.brucelindbloom.com/
CIE_XYZColor cieXyz = color.ToCIE_XYZ();
CIE_XYZColor referenceWhite = Color.white.ToCIE_XYZ();
//xr = X / Xr
float auxX = cieXyz._x / referenceWhite._x;
//yr = Y / Yr
float auxY = cieXyz._y / referenceWhite._y;
//zr = Z / Zr
float auxZ = cieXyz._z / referenceWhite._z;
//if xr > 0.008856
// fx = xr ^ 1/3
//else
// fx = (903.3 * xr + 16) / 116
auxX = (auxX > 0.008856f) ? Mathf.Pow(auxX, 1 / 3f) : ((903.3f * auxX + 16) / 116f);
//if yr > 0.008856
// fy = yr ^ 1/3
//else
// fy = (903.3 * yr + 16) / 116
auxY = (auxY > 0.008856f) ? Mathf.Pow(auxY, 1 / 3f) : ((903.3f * auxY + 16) / 116f);
//if zr > 0.008856
// fz = zr ^ 1/3
//else
// fz = (903.3 * zr + 16) / 116
auxZ = (auxZ > 0.008856f) ? Mathf.Pow(auxZ, 1 / 3f) : ((903.3f * auxZ + 16) / 116f);
CIELabColor cieLab = new CIELabColor();
//L = 116 * fy -16
cieLab._l = 116 * auxY - 16;
//a = 500 * (fx - fy)
cieLab._a = 500 * (auxX - auxY);
//b = 200 * (fy - fz)
cieLab._b = 200 * (auxY - auxZ);
return(cieLab);
}
