private XYZColor rgb_to_xyz(Color rgb_col)
{
var red = (double)rgb_col.R;
var green = (double)rgb_col.G;
var blue = (double)rgb_col.B;
var _red = red / 255;
var _green = green / 255;
var _blue = blue / 255;
if (_red > 0.04045)
{
_red = (_red + 0.055) / 1.055;
_red = Math.Pow(_red, 2.4);
}
else
{
_red = _red / 12.92;
}
if (_green > 0.04045)
{
_green = (_green + 0.055) / 1.055;
_green = Math.Pow(_green, 2.4);
}
else
{
_green = _green / 12.92;
}
if (_blue > 0.04045)
{
_blue = (_blue + 0.055) / 1.055;
_blue = Math.Pow(_blue, 2.4);
}
else
{
_blue = _blue / 12.92;
}
_red *= 100;
_green *= 100;
_blue *= 100;
XYZColor converted = new XYZColor();
converted.x = _red * 0.4124 + _green * 0.3576 + _blue * 0.1805;
converted.y = _red * 0.2126 + _green * 0.7152 + _blue * 0.0722;
converted.x = _red * 0.0193 + _green * 0.1192 + _blue * 0.9505;
return(converted);
}
private LABColor xyz_to_lab(XYZColor xyz_col)
{
var x = xyz_col.x;
var y = xyz_col.y;
var z = xyz_col.z;
var _x = x / 95.047;
var _y = y / 100;
var _z = z / 108.883;
if (_x > 0.008856)
{
_x = Math.Pow(_x, 1.0d / 3.0d);
}
else
{
_x = 7.787 * _x + 16.0d / 116.0d;
}
if (_y > 0.008856)
{
_y = Math.Pow(_y, 1.0d / 3.0d);
}
else
{
_y = 7.787 * _y + 16.0d / 116.0d;
}
if (_z > 0.008856)
{
_z = Math.Pow(_z, 1.0d / 3.0d);
}
else
{
_z = 7.787 * _z + 16.0d / 116.0d;
}
var l = 116 * _y - 16.0d;
var a = 500 * (_x - _y);
var b = 200 * (_y - _z);
return(new LABColor {
L = l, A = a, B = b
});
}
