/// <summary>
/// Creates Images of an optical illusion that tricks the mind into
/// seeing more different colors (4) than are actually present in the
/// image (3).
/// </summary>
public static PixImage <byte> CreateHowManyColorsIllusion(int size, bool parallel = true)
{
var scale = 1024.0 / size;
var delta = 0.5 * (double)(size - 1);
var pixImage = new PixImage <byte>(size, size, 3);
var colorMatrix = pixImage.GetMatrix <C3b>();
var orange = new C3b(255, 150, 0);
var magenta = new C3b(255, 0, 255);
var bluegreen = new C3b(0, 255, 150);
Func <long, long, C3b> pixelFun = (x, y) =>
{
var xd = scale * (x - delta); var yd = scale * (y - delta);
var r = Fun.Sqrt(xd * xd + yd * yd);
var phi = Fun.Atan2(yd, xd);
var lp1 = phi / Constant.PiTimesFour;
var lp2 = phi / Constant.Pi; // TimesTwo;
var lr = Fun.Log(r) / Constant.E;
var p1 = Fun.Frac(0.05 + 4 * (lr - lp1));
var p2 = Fun.Frac(96 * (lr + lp2)); // 64
return(p2 < 0.5
? (p1 >= 0.0 && p1 < 0.25 ? bluegreen : orange)
: (p1 >= 0.5 && p1 < 0.75 ? bluegreen : magenta));
};
if (parallel)
{
colorMatrix.SetByCoordParallelY(pixelFun);
}
else
{
colorMatrix.SetByCoord(pixelFun);
}
return(pixImage);
}
public static System.Drawing.Color ToColor(this C3b color)
{
return(System.Drawing.Color.FromArgb(
color.R, color.G, color.B));
}
/// <summary>Computes MD5 hash of given data.</summary>
public static Guid ComputeMd5Hash(this C3b x)
=> ComputeMd5Hash(bw => { bw.Write(x.R); bw.Write(x.G); bw.Write(x.B); });
public void Write(C3b c)
{
Write(c.R); Write(c.G); Write(c.B);
}
/// <summary> /// C3b to System.Drawing.Color. /// </summary> public static Color ToColor(this C3b color) => Color.FromArgb(color.R, color.G, color.B);
