/// <summary>
/// Converts CIEXYZ to CIELab.
/// </summary>
public CIELab XYZtoLab(CIEXYZ xyz)
{
CIELab lab = CIELab.Empty;
lab.L = 116.0 * Fxyz(xyz.Y / CIEXYZ.D65.Y) - 16;
lab.A = 500.0 * (Fxyz(xyz.X / CIEXYZ.D65.X) - Fxyz(xyz.Y / CIEXYZ.D65.Y));
lab.B = 200.0 * (Fxyz(xyz.Y / CIEXYZ.D65.Y) - Fxyz(xyz.Z / CIEXYZ.D65.Z));
return(lab);
}
private void UnlockButton_Click(object sender, RoutedEventArgs e)
{
// Debug.WriteLine("PRESSED");
// check the colors
//From: http://stackoverflow.com/questions/5392061/algorithm-to-check-similarity-of-colors-based-on-rgb-values-or-maybe-hsv
//I would recommend using cie94 (deltae-1994), it's said to be a decent representation of the human color perception. i've used it quite a bit in my computer-vision related applications, and i am rather happy with the result.
//it's however rather computational expensive to perform such a comparison:
//rgb to xyz for both colors
//xyz to lab for both colors
//diff = deltae94(labcolor1, labcolor2)
Color color = this.colorPick1.Color;
Color color2 = this.colorPick2.Color;
this.Container.Background = new SolidColorBrush(Windows.UI.Color.FromArgb(255,
(byte)((color.R + color2.R) / 2),
(byte)((color.G + color2.G) / 2),
(byte)((color.B + color2.B) / 2)));
//Debug.WriteLine("secretCIEL1:" + secretCIEL1 + " secretCIELa1:" + secretCIEa1 + " secretCIEb1:" + secretCIEb1);
//Debug.WriteLine("r:" + color.R + " g:" + color.G + " b:" + color.B);
CIEXYZ c1 = RGBtoXYZ(color.R, color.G, color.B);
//Debug.WriteLine("x:" + c1.X + " y:" + c1.Y + " z:" + c1.Z);
CIELab lab1 = XYZtoLab(c1);
//Debug.WriteLine("lab1L:" + lab1.L + " lab1a:" + lab1.A + " lab1b:" + lab1.B);
double delta = delta1994(lab1.L, lab1.A, lab1.B, secretCIEL1, secretCIEa1, secretCIEb1);
//Debug.WriteLine("delta:" + delta);
if (delta <= allowedColorDelta)
{
// pretty close match, now check the next one
CIELab lab2 = XYZtoLab(RGBtoXYZ(color2.R, color2.G, color2.B));
delta = delta1994(lab2.L, lab2.A, lab2.B, secretCIEL2, secretCIEa2, secretCIEb2);
if (delta <= allowedColorDelta)
{
// reset the colors
this.colorPick1.Color = Windows.UI.Color.FromArgb(255, 0, 0, 255);
this.colorPick2.Color = Windows.UI.Color.FromArgb(255, 255, 0, 255);
//Debug.WriteLine("UNLOCKED WOOWOWOWOWOW");
Storyboard sb = (Storyboard)this.Resources["ShowUnlock"];
sb.Begin();
}
}
}