protected override void FromRgb(Rgb color)
{
var xyz = color.ToColorSpace<Xyz>();
var dividend = xyz.X + xyz.Y + xyz.Z;
Y1 = xyz.Y;
X = dividend.ApproximatelyEquals(0) ? 0 : xyz.X / dividend;
Y2 = dividend.ApproximatelyEquals(0) ? 0 : xyz.Y / dividend;
}
public Yxy(Rgb color)
{
FromRgb(color);
}
protected override void FromRgb(Rgb color)
{
var r1 = color.R / 255.0;
var g1 = color.G / 255.0;
var b1 = color.B / 255.0;
var cMin = r1;
var cMax = r1;
if (g1 > cMax)
cMax = g1;
if (b1 > cMax)
cMax = b1;
if (g1 < cMin)
cMin = g1;
if (b1 < cMin)
cMin = b1;
var delta = cMax - cMin;
H = 0;
S = 0;
L = (cMax + cMin) / 2.0;
if (!color.R.Equals(color.G) || !color.G.Equals(color.B))
{
if (r1.Equals(cMax))
H = (g1 - b1) / delta;
else if (g1.Equals(cMax))
H = 2.0 + (b1 - r1) / delta;
else if (b1.Equals(cMax))
H = 4.0 + (r1 - g1) / delta;
H *= 60.0;
if (H < 0) H += 360.0;
}
if (!delta.Equals(0))
{
S = delta / (1.0 - System.Math.Abs(2.0 * L - 1.0));
}
}
public Hsl(Rgb color)
{
FromRgb(color);
}
protected override void FromRgb(Rgb color)
{
var xyz = color.ToColorSpace<Xyz>();
var x = xyz.X / Xyz.WhiteReference[0];
var y = xyz.Y / Xyz.WhiteReference[1];
var z = xyz.Z / Xyz.WhiteReference[2];
x = x > Xyz.Epsilon ? CubicRoot(x) : (Xyz.Kappa * x + 16) / 116;
y = y > Xyz.Epsilon ? CubicRoot(y) : (Xyz.Kappa * y + 16) / 116;
z = z > Xyz.Epsilon ? CubicRoot(z) : (Xyz.Kappa * z + 16) / 116;
L = System.Math.Max(0, 116 * y - 16);
A = 500 * (x - y);
B = 200 * (y - z);
}
public Lab(Rgb color)
{
FromRgb(color);
}
protected override void FromRgb(Rgb color)
{
var r = color.R / 255.0;
var g = color.G / 255.0;
var b = color.B / 255.0;
r = (r > 0.04045 ? System.Math.Pow((r + 0.055) / 1.055, 2.4) : r / 12.92) * 100.0;
g = (g > 0.04045 ? System.Math.Pow((g + 0.055) / 1.055, 2.4) : g / 12.92) * 100.0;
b = (b > 0.04045 ? System.Math.Pow((b + 0.055) / 1.055, 2.4) : b / 12.92) * 100.0;
// TODO: Hard-coded to use sRGB. Update to allow multiple working spaces
X = r * RgbXyzMatrix.SRgb[0, 0] + g * RgbXyzMatrix.SRgb[0, 1] + b * RgbXyzMatrix.SRgb[0, 2];
Y = r * RgbXyzMatrix.SRgb[1, 0] + g * RgbXyzMatrix.SRgb[1, 1] + b * RgbXyzMatrix.SRgb[1, 2];
Z = r * RgbXyzMatrix.SRgb[2, 0] + g * RgbXyzMatrix.SRgb[2, 1] + b * RgbXyzMatrix.SRgb[2, 2];
}
public Lch(Rgb color)
{
FromRgb(color);
}
public Luv(Rgb color)
{
FromRgb(color);
}
protected override void FromRgb(Rgb color)
{
R = color.R;
G = color.G;
B = color.B;
}
protected override void FromRgb(Rgb color)
{
var xyz = color.ToColorSpace<Xyz>();
var y = xyz.Y / Xyz.WhiteReference[1];
L = y > Xyz.Epsilon ? 116.0 * System.Math.Pow(y, 1.0 / 3.0) - 16.0 : Xyz.Kappa * y;
var targetDenominator = xyz.X + 15.0 * xyz.Y + 3.0 * xyz.Z;
var referenceDenominator = Xyz.WhiteReference[0] + 15.0 * Xyz.WhiteReference[1] + 3.0 * Xyz.WhiteReference[2];
var xTarget = targetDenominator.Equals(0)
? 0
: 4.0 * xyz.X / targetDenominator -
4.0 * Xyz.WhiteReference[0] / referenceDenominator;
var yTarget = targetDenominator.Equals(0)
? 0
: 9.0 * xyz.Y / targetDenominator -
9.0 * Xyz.WhiteReference[1] / referenceDenominator;
U = 13.0 * L * xTarget;
V = 13.0 * L * yTarget;
}
public HunterLab(Rgb color)
{
FromRgb(color);
}
protected override void FromRgb(Rgb color)
{
var xyz = color.ToColorSpace<Xyz>();
L = 10.0 * System.Math.Sqrt(xyz.Y);
A = !xyz.Y.Equals(0) ? 17.5 * ((1.02 * xyz.X - xyz.Y) / System.Math.Sqrt(xyz.Y)) : 0;
B = !xyz.Y.Equals(0) ? 7.0 * ((xyz.Y - 0.847 * xyz.Z) / System.Math.Sqrt(xyz.Y)) : 0;
}
protected override void FromRgb(Rgb color)
{
var cmy = new Cmy(color);
var k = 1.0;
if (cmy.C < k)
k = cmy.C;
if (cmy.M < k)
k = cmy.M;
if (cmy.Y < k)
k = cmy.Y;
K = k;
if (k.ApproximatelyEquals(1.0))
{
C = 0;
M = 0;
Y = 0;
}
else
{
C = (cmy.C - k) / (1 - k);
M = (cmy.M - k) / (1 - k);
Y = (cmy.Y - k) / (1 - k);
}
}
protected override void FromRgb(Rgb color)
{
base.FromRgb(color);
var rgba = color as Rgba;
if (rgba != null)
A = rgba.A;
}
public Cmyk(Rgb color)
{
FromRgb(color);
}
protected override void FromRgb(Rgb color)
{
var lab = new Lab(color);
var hDeg = System.Math.Atan2(lab.B, lab.A);
if (hDeg > 0)
{
hDeg = hDeg / System.Math.PI * 180.0;
}
else
{
hDeg = 360.0 - System.Math.Abs(hDeg) / System.Math.PI * 180.0;
}
if (hDeg < 0)
hDeg += 360.0;
else if (hDeg >= 360)
hDeg -= 360.0;
L = lab.L;
C = System.Math.Sqrt(lab.A * lab.A + lab.B * lab.B);
H = hDeg;
}
