public IColor FromXYZColor(XYZColor xyzColor)
{
var x = xyzColor.X / (xyzColor.X + xyzColor.Y + xyzColor.Z);
var y = xyzColor.Y / (xyzColor.X + xyzColor.Y + xyzColor.Z);
return new xyYColor(xyzColor.Alpha, x, y, xyzColor.Y);
}
public IColor FromXYZColor(XYZColor xyzColor)
{
var xyzVector = new double[3] { xyzColor.X.Value, xyzColor.Y.Value, xyzColor.Z.Value };
var rgbVector = Multiply(M_XYZToRGB, xyzVector);
return GetColor(xyzColor.Alpha.Value, rgbVector[0], rgbVector[1], rgbVector[2]);
}
internal XYZColorSpace()
{
Alpha = new ColorChannelDefinition(this, "Alpha", "A");
// DisplayValue = Value * 100 and up to three fraction digits
X = new ColorChannelDefinition(this, "X", "X", (v) => Math.Round(100 * v, 3, MidpointRounding.AwayFromZero));
Y = new ColorChannelDefinition(this, "Y", "Y", (v) => Math.Round(100 * v, 3, MidpointRounding.AwayFromZero));
Z = new ColorChannelDefinition(this, "Z", "Z", (v) => Math.Round(100 * v, 3, MidpointRounding.AwayFromZero));
whitePoint = new XYZColor(this, 1.0, 0.95047, 1.0, 1.088969);
}
public IColor FromXYZColor(XYZColor xyzColor)
{
/// conversion algorithm created with help of http://en.wikipedia.org/wiki/Lab_color_space
var fx = f_forward_conversion(xyzColor.X, KnownColorSpaces.XYZ.WhitePoint.X);
var fy = f_forward_conversion(xyzColor.Y, KnownColorSpaces.XYZ.WhitePoint.Y);
var fz = f_forward_conversion(xyzColor.Z, KnownColorSpaces.XYZ.WhitePoint.Z);
var L = 116 * fy - 16;
var a = 500 * (fx - fy);
var b = 200 * (fy - fz);
return new LabColor(xyzColor.Alpha, L, a, b);
}
public IColor FromXYZColor(XYZColor xyzColor)
{
return xyzColor;
}