internal static void ToColorSpace(IRgb color, ILuv item)
{
var xyz = new Xyz();
var white = XyzConverter.WhiteReference;
xyz.Initialize(color);
var y = xyz.Y / XyzConverter.WhiteReference.Y;
item.L = y > XyzConverter.Epsilon ? 116.0 * XyzConverter.CubicRoot(y) - 16.0 : XyzConverter.Kappa * y;
var targetDenominator = GetDenominator(xyz);
var referenceDenominator = GetDenominator(white);
// ReSharper disable CompareOfFloatsByEqualityOperator
var xTarget = targetDenominator == 0
? 0
: ((4.0 * xyz.X / targetDenominator) - (4.0 * white.X / referenceDenominator));
var yTarget = targetDenominator == 0
? 0
: ((9.0 * xyz.Y / targetDenominator) - (9.0 * white.Y / referenceDenominator));
// ReSharper restore CompareOfFloatsByEqualityOperator
item.U = 13.0 * item.L * xTarget;
item.V = 13.0 * item.L * yTarget;
}
internal static IRgb ToColor(ILuv item)
{
var white = XyzConverter.WhiteReference;
const double c = -1.0 / 3.0;
var uPrime = (4.0 * white.X) / GetDenominator(white);
var vPrime = (9.0 * white.Y) / GetDenominator(white);
var a = (1.0 / 3.0) * ((52.0 * item.L) / (item.U + 13 * item.L * uPrime) - 1.0);
// ReSharper disable once InconsistentNaming
var imteL_16_116 = (item.L + 16.0) / 116.0;
var y = item.L > XyzConverter.Kappa * XyzConverter.Epsilon
? imteL_16_116 * imteL_16_116 * imteL_16_116
: item.L / XyzConverter.Kappa;
var b = -5.0 * y;
var d = y * ((39.0 * item.L) / (item.V + 13.0 * item.L * vPrime) - 5.0);
var x = (d - b) / (a - c);
var z = x * a + b;
var xyz = new Xyz
{
X = 100 * x,
Y = 100 * y,
Z = 100 * z
};
return(xyz.ToRgb());
}
protected static void ExpectedValuesForKnownColor(IColorSpace knownColor, ILuv expectedColor)
{
var target = knownColor.To <Luv>();
Assert.IsTrue(CloseEnough(expectedColor.L, target.L), "(L)" + expectedColor.L + " != " + target.L);
Assert.IsTrue(CloseEnough(expectedColor.U, target.U), "(U)" + expectedColor.U + " != " + target.U);
Assert.IsTrue(CloseEnough(expectedColor.V, target.V), "(V)" + expectedColor.V + " != " + target.V);
}
protected static void ExpectedValuesForKnownColor(IColorSpace knownColor, ILuv expectedColor)
{
var target = knownColor.To <Luv>();
Assert.AreEqual(expectedColor.L, target.L, 0.5, "(L)" + expectedColor.L + " != " + target.L);
Assert.AreEqual(expectedColor.U, target.U, 1.12, "(U)" + expectedColor.U + " != " + target.U);
Assert.AreEqual(expectedColor.V, target.V, 0.61, "(V)" + expectedColor.V + " != " + target.V);
}
internal static void ToColorSpace(IRgb color, ILuv item)
{
var xyz = new Xyz();
var white = XyzConverter.WhiteReference;
xyz.Initialize(color);
var y = xyz.Y / XyzConverter.WhiteReference.Y;
item.L = y > XyzConverter.Epsilon ? 116.0 * XyzConverter.CubicRoot(y) - 16.0 : XyzConverter.Kappa * y;
var targetDenominator = GetDenominator(xyz);
var referenceDenominator = GetDenominator(white);
// ReSharper disable CompareOfFloatsByEqualityOperator
var xTarget = targetDenominator == 0 ? 0 : ((4.0 * xyz.X / targetDenominator) - (4.0 * white.X / referenceDenominator));
var yTarget = targetDenominator == 0 ? 0 : ((9.0 * xyz.Y / targetDenominator) - (9.0 * white.Y / referenceDenominator));
// ReSharper restore CompareOfFloatsByEqualityOperator
item.U = 13.0 * item.L * xTarget;
item.V = 13.0 * item.L * yTarget;
}
internal static IRgb ToColor(ILuv item)
{
var white = XyzConverter.WhiteReference;
const double c = -1.0 / 3.0;
var uPrime = (4.0 * white.X) / GetDenominator(white);
var vPrime = (9.0 * white.Y) / GetDenominator(white);
var a = (1.0 / 3.0) * ((52.0 * item.L) / (item.U + 13 * item.L * uPrime) - 1.0);
var imteL_16_116 = (item.L + 16.0) / 116.0;
var y = item.L > XyzConverter.Kappa * XyzConverter.Epsilon
? imteL_16_116 * imteL_16_116 * imteL_16_116
: item.L / XyzConverter.Kappa;
var b = -5.0 * y;
var d = y * ((39.0 * item.L) / (item.V + 13.0 * item.L * vPrime) - 5.0);
var x = (d - b) / (a - c);
var z = x * a + b;
var xyz = new Xyz
{
X = 100 * x,
Y = 100 * y,
Z = 100 * z
};
return xyz.ToRgb();
}
internal static IRgb ToColor(ILuv item)
{
var white = XyzConverter.WhiteReference;
const double c = -1.0 / 3.0;
var uPrime = 4.0 * white.X / GetDenominator(white);
var vPrime = 9.0 * white.Y / GetDenominator(white);
var a = 1.0 / 3.0 * (52.0 * item.L / (item.U + 13 * item.L * uPrime) - 1.0);
var imteL16116 = (item.L + 16.0) / 116.0;
var y = item.L > XyzConverter.Kappa * XyzConverter.Epsilon
? imteL16116 * imteL16116 * imteL16116
: item.L / XyzConverter.Kappa;
var b = -5.0 * y;
var d = y * (39.0 * item.L / (item.V + 13.0 * item.L * vPrime) - 5.0);
var x = (d - b) / (a - c);
var z = x * a + b;
var xyz = new Xyz
{
X = 100 * x,
Y = 100 * y,
Z = 100 * z
};
return(xyz.ToRgb());
}
protected static void ExpectedValuesForKnownColor(IColorSpace knownColor, ILuv expectedColor)
{
var target = knownColor.To<Luv>();
Assert.IsTrue(CloseEnough(expectedColor.L,target.L),"(L)" + expectedColor.L + " != " + target.L);
Assert.IsTrue(CloseEnough(expectedColor.U,target.U),"(U)" + expectedColor.U + " != " + target.U);
Assert.IsTrue(CloseEnough(expectedColor.V,target.V),"(V)" + expectedColor.V + " != " + target.V);
}
public CmyColor(ILuv luv)
{
Initialize(luv.ToRgb());
}
public LuvColor(ILuv luv)
{
Ordinals = luv.Ordinals;
}
public HunterLabColor(ILuv luv)
{
Initialize(luv.ToRgb());
}
