public Gif Rainbow(Bitmap b, IMessage m)
{
Vector3[,] HSVimage = new Vector3[b.Width, b.Height];
int[,] Alphas = new int[b.Width, b.Height];
using (UnsafeBitmapContext c = ImageExtensions.CreateUnsafeContext(b))
for (int x = 0; x < b.Width; x++)
{
for (int y = 0; y < b.Height; y++)
{
Color col = c.GetPixel(x, y);
Alphas[x, y] = col.A;
HSVimage[x, y] = new Vector3(col.GetHue(), col.GetSaturation(), col.GetValue());
}
}
int steps = 20;
int stepWidth = 360 / steps;
Bitmap[] re = new Bitmap[steps];
for (int i = 0; i < steps; i++)
{
re[i] = new Bitmap(b.Width, b.Height);
using UnsafeBitmapContext c = ImageExtensions.CreateUnsafeContext(re[i]);
for (int x = 0; x < b.Width; x++)
{
for (int y = 0; y < b.Height; y++)
{
c.SetPixel(x, y, Color.FromArgb(Alphas[x, y], HSVimage[x, y].HsvToRgb()));
HSVimage[x, y].X += stepWidth;
while (HSVimage[x, y].X > 360)
{
HSVimage[x, y].X -= 360;
}
}
}
}
return(new Gif(re, Enumerable.Repeat(33, re.Length).ToArray()));
}