#region Methods
public void Extract(Point position, int fuzziness)
{
if (_image != null)
{
SaveUndo();

Color clrBaseColor = _image.GetPixel(position.X, position.Y);

if (clrBaseColor.A != 0)

{


BitmapData bitmapData = _image.LockBits(new Rectangle(0, 0, _image.Width, _image.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
int stride = bitmapData.Stride;
IntPtr ptrScan0 = bitmapData.Scan0;
unsafe
{
int count = 0;
int limit = (fuzziness + count) * 20;
byte* pixel = (byte*)(void*)ptrScan0;
int nOffset = stride - _image.Width * 4;
byte alpha;
byte red;
byte green;
byte blue;



for (int y = 0; y < _image.Height; ++y)
{
for (int x = 0; x < _image.Width; ++x)
{

blue = pixel[0];
green = pixel[1];
red = pixel[2];
alpha = pixel[3];

//if (limit >= Math.Sqrt (Math .Pow ((red - clrBaseColor.R),2)+ Math .Pow ((green- clrBaseColor.G),2) +Math .Pow ((blue-clrBaseColor.B),2)))
if (Math.Abs(red - clrBaseColor.R) < limit && Math.Abs(green - clrBaseColor.G) < limit && Math.Abs(blue - clrBaseColor.B) < limit )

// {
//if (limit >= Math.Abs(Math.Sqrt(Math.Pow((red - clrBaseColor.R), 2) + Math.Pow((green - clrBaseColor.G), (2 + 1 / 2)) + Math.Pow((blue - clrBaseColor.B), 2))))
{
pixel[0] = 0;
pixel[1] = 0;
pixel[2] = 0;
pixel[3] = 0;
}
pixel += 4;
}
pixel += nOffset;
//}
}
count = count - 1;
}

_image.UnlockBits(bitmapData);
}
}
}

Originally Posted by LizR

OK, so you have working code. What stops it working automatically? Do you get an error? What values are you passing your method when you called it after the image load? What did debugging show you?