public void PickCorrelateLayer()
{
var layer = new Layer(_image, "test", ImageType.Rgb);
var c = new Coordinate <int>(_width / 2, _height / 2);
Assert.IsNull(_image.PickCorrelateLayer(c));
_image.InsertLayer(layer, 0);
var picked = _image.PickCorrelateLayer(c);
Assert.AreEqual(layer, picked);
}