public static CIELabColor RGBToCIELab(System.Drawing.Color color)
{
const double ref_X = 95.044998168945313;
const double ref_Y = 100.000;
const double ref_Z = 108.89199829101562;
var tmpLabColor = new CIELabColor( );
var tmpColorR = (double)color.R / 255;
var tmpColorG = (double)color.G / 255;
var tmpColorB = (double)color.B / 255;
tmpColorR = (tmpColorR <= 0.04045) ? tmpColorR / 12.92 : System.Math.Pow((tmpColorR + 0.055) / 1.055, 2.4);
tmpColorG = (tmpColorG <= 0.04045) ? tmpColorG / 12.92 : System.Math.Pow((tmpColorG + 0.055) / 1.055, 2.4);
tmpColorB = (tmpColorB <= 0.04045) ? tmpColorB / 12.92 : System.Math.Pow((tmpColorB + 0.055) / 1.055, 2.4);
tmpColorR *= 100;
tmpColorG *= 100;
tmpColorB *= 100;
var tmpColorX = (tmpColorR * 0.4124240 + tmpColorG * 0.357579 + tmpColorB * 0.1804640) / ref_X; //Observer = 2°, Illuminant = D65
var tmpColorY = (tmpColorR * 0.2126560 + tmpColorG * 0.715158 + tmpColorB * 0.0721856) / ref_Y;
var tmpColorZ = (tmpColorR * 0.0193324 + tmpColorG * 0.119193 + tmpColorB * 0.9504440) / ref_Z;
tmpColorX = (tmpColorX > 0.008856) ? System.Math.Pow(tmpColorX, (double)1 / 3) : 7.787 * tmpColorX + (double)16 / 116;
tmpColorY = (tmpColorY > 0.008856) ? System.Math.Pow(tmpColorY, (double)1 / 3) : 7.787 * tmpColorY + (double)16 / 116;
tmpColorZ = (tmpColorZ > 0.008856) ? System.Math.Pow(tmpColorZ, (double)1 / 3) : 7.787 * tmpColorZ + (double)16 / 116;
tmpLabColor.L = (int)(tmpColorY * 116.0 - 16);
tmpLabColor.A = (int)((tmpColorX - tmpColorY) * 500.0);
tmpLabColor.B = (int)((tmpColorY - tmpColorZ) * 200.0);
return(tmpLabColor);
}
public static System.Drawing.Color CIELabToColor(CIELabColor labColor)
{
const double ref_X = 95.044998168945313;
const double ref_Y = 100.000;
const double ref_Z = 108.89199829101562;
double var_Y = (labColor.L + 16.0) / 116.0;
double var_X = labColor.A / 500.0 + var_Y;
double var_Z = var_Y - labColor.B / 200.0;
double tmpVarY = System.Math.Pow(var_Y, 3);
double tmpVarX = System.Math.Pow(var_X, 3);
double tmpVarZ = System.Math.Pow(var_Z, 3);
var_Y = (tmpVarY > 0.008856) ? tmpVarY : (var_Y - (double)16 / 116) / 7.787;
var_X = (tmpVarX > 0.008856) ? tmpVarX : (var_X - (double)16 / 116) / 7.787;
var_Z = (tmpVarZ > 0.008856) ? tmpVarZ : (var_Z - (double)16 / 116) / 7.787;
var_X = ref_X * var_X / 100; //ref_X = 95.047 Observer= 2°, Illuminant= D65
var_Y = ref_Y * var_Y / 100; //ref_Y = 100.000
var_Z = ref_Z * var_Z / 100; //ref_Z = 108.883
double var_R = var_X * +3.2406 + var_Y * -1.5372 + var_Z * -0.4986;
double var_G = var_X * -0.9689 + var_Y * +1.8758 + var_Z * +0.0415;
double var_B = var_X * +0.0557 + var_Y * -0.2040 + var_Z * +1.0570;
var_R = (var_R <= 0.0031308) ? 12.92 * var_R : 1.055 * (System.Math.Pow(var_R, 0.4166666667) - 0.055);
var_G = (var_G <= 0.0031308) ? 12.92 * var_G : 1.055 * (System.Math.Pow(var_G, 0.4166666667) - 0.055);
var_B = (var_B <= 0.0031308) ? 12.92 * var_B : 1.055 * (System.Math.Pow(var_B, 0.4166666667) - 0.055);
int tmpColorR = (int)(var_R * 255), tmpColorG = (int)(var_G * 255), tmpColorB = (int)(var_B * 255);
if (tmpColorR < 0)
{
tmpColorR = 0;
}
if (tmpColorG < 0)
{
tmpColorG = 0;
}
if (tmpColorB < 0)
{
tmpColorB = 0;
}
if (tmpColorR > 255)
{
tmpColorR = 255;
}
if (tmpColorG > 255)
{
tmpColorG = 255;
}
if (tmpColorB > 255)
{
tmpColorB = 255;
}
return(System.Drawing.Color.FromArgb(tmpColorR, tmpColorG, tmpColorB));
}
public static Color CIELabColorToRgbColor(CIELabColor labColor)
{
var rgbColor = new Lab
{
L = LUShortToDouble(labColor.L),
A = ABUShortToDouble(labColor.A),
B = ABUShortToDouble(labColor.B)
}.To <Rgb>();
return(Color.FromArgb(
(int)Math.Round(rgbColor.R),
(int)Math.Round(rgbColor.G),
(int)Math.Round(rgbColor.B)
));
}
/// <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);
}
public static System.Drawing.Color ToColor(int luminance, int labColorA, int labColorB)
{
return(CIELabColor.ToColor(new CIELabColor(luminance, labColorA, labColorB)));
}
public static System.Drawing.Color ToColor(CIELabColor color)
{
return(HuiruiSoft.Drawing.ColorTranslator.FromCIELab(color.L, color.A, color.B));
}
public System.Drawing.Color ToColor( )
{
return(CIELabColor.ToColor(this));
}