public static GradientBrush Convert(System.Windows.Media.Color color)
{
var scrgb = color.ToScRGBColor();
var xyz = KnownColorSpaces.scRGB.ToXYZColor(scrgb);
var lab = KnownColorSpaces.Lab.FromXYZColor(xyz) as LabColor;
var l_base = lab.L;
var gradientStops = new GradientStopCollection();
var _lab = new LabColor(0xff, l_base * 1.07, lab.a, lab.b);
var _c = _lab.ToWindowsMediaColor();
gradientStops.Add(new GradientStop(_c, 0.5));
_lab = new LabColor(0xff, l_base * .93, lab.a, lab.b);
_c = _lab.ToWindowsMediaColor();
gradientStops.Add(new GradientStop(_c, 1));
var result = new LinearGradientBrush(gradientStops, 90);
result.Freeze();
return result;
}
/// <summary>
/// Returns new color based on existing color with modified lightness component.
/// </summary>
/// <param name="color"></param>
/// <param name="lightnessMultiplier">0.5 to reduce lightness by 50%, 1.5 to increase lightness by 50%</param>
/// <returns></returns>
public static System.Windows.Media.Color ChangeLighthness(this System.Windows.Media.Color color, double lightnessMultiplier)
{
var scRGB = color.ToScRGBColor();
var xyz = KnownColorSpaces.scRGB.ToXYZColor(scRGB);
var lab = (LabColor) KnownColorSpaces.Lab.FromXYZColor(xyz);
var newColor = new LabColor(lab.Alpha, lab.L * lightnessMultiplier, lab.a, lab.b);
return newColor.ToWindowsMediaColor();
}
