public static LinearRgbColor ToLinearRgb(this CieXyzColor source)
{
Vector4 xyz = new Vector4((float)source.X, (float)source.Y, (float)source.Z, 1.0f);
Vector4 rgb = Vector4.Transform(xyz, cieToLinearRgbTransform);
return(new LinearRgbColor
{
R = rgb.X,
G = rgb.Y,
B = rgb.Z
});
}
public static CieLabColor ToCieLab(this CieXyzColor source)
{
float L = 116.0f * f(source.Y / CieConstants.Yn) - 16.0f;
float a = 500.0f * (f(source.X / CieConstants.Xn) - f(source.Y / CieConstants.Yn));
float b = 200.0f * (f(source.Y / CieConstants.Yn) - f(source.Z / CieConstants.Zn));
return(new CieLabColor
{
L = L,
a = a,
b = b
});
float f(float t)
{
return(t > CieConstants.delta * CieConstants.delta * CieConstants.delta ? (float)Math.Pow(t, 1.0 / 3.0) : t / (3 * CieConstants.delta * CieConstants.delta) + 4.0f / 29.0f);
}
}
public static CieLuvColor ToCieLuv(this CieXyzColor source)
{
const float inflectionPoint = (6.0f / 29.0f) * (6.0f / 29.0f) * (6.0f / 29.0f);
float inflectionTest = source.Y / CieConstants.Yn;
float denominator = (source.X + 15.0f * source.Y + 3.0f * source.Z);
float uPrime = denominator == 0.0f ? 0.0f : (4.0f * source.X) / denominator;
float vPrime = denominator == 0.0f ? 0.0f : (9.0f * source.Y) / denominator;
float L = inflectionTest <= inflectionPoint ? (29.0f / 3.0f) * (29.0f / 3.0f) * (29.0f / 3.0f) * source.Y / CieConstants.Yn : 116.0f * (float)Math.Pow(source.Y / CieConstants.Yn, 1.0f / 3.0f) - 16.0f;
float u = 13.0f * L * (uPrime - CieConstants.uN);
float v = 13.0f * L * (vPrime - CieConstants.vN);
return(new CieLuvColor
{
L = L,
u = u,
v = v
});
}
public static StandardRgbColor ToStandardRgb(this CieXyzColor source)
{
return(source.ToLinearRgb().ToStandardRgb());
}
