Getting a pixel color from a zoomed Bitmapviewer

public class ColorPickerNavigator : UserInputController, INavigator
{
	public ColorPickerNavigator()
	{
		//The cursor file should be an embedded resource to be called this way.
		_cursor = new System.Windows.Forms.Cursor(GetType(), "ColorPicker.cur");
	}

	public override void Connect(ViewerBase viewer)
	{
		base.Connect (viewer);
		base.Viewer.WorkspaceMouseDown += new Aurigma.GraphicsMill.WinControls.MouseEventHandler(OnWorkspaceMouseDown);
	}

	public override void Disconnect()
	{
		base.Disconnect ();
		base.Viewer.WorkspaceMouseDown -= new Aurigma.GraphicsMill.WinControls.MouseEventHandler(OnWorkspaceMouseDown);
	}

	private void OnWorkspaceMouseDown(object sender, Aurigma.GraphicsMill.WinControls.MouseEventArgs e)
	{
		if (IsViewerAttached && ViewerHasContent)
		{
			BitmapViewer bitmapViewer = (BitmapViewer)Viewer;

			//Retrieve the pixel color value.
			int x = System.Math.Max(0, System.Math.Min((int)e.X, bitmapViewer.Bitmap.Width - 1));
			int y = System.Math.Max(0, System.Math.Min((int)e.Y, bitmapViewer.Bitmap.Height - 1));

			Color color = bitmapViewer.Bitmap.GetPixel(x, y);

			//The RGB channel values will be displayed, so we convert the colorspace
			//to RGB if needed.
			if (color.ColorSpace != ColorSpace.Rgb)
				color.ConvertColorSpace(ColorSpace.Rgb);

			//...Do something to the color values...
			//For example, read the channel values into a text string and copy
			//it to the clipboard.
			string text = String.Format("R: {0} G: {1} B: {2}",
				color.GetChannel32(ColorChannel.Red),
				color.GetChannel32(ColorChannel.Green),
				color.GetChannel32(ColorChannel.Blue));
			System.Windows.Forms.Clipboard.SetDataObject(text, true);
		}
	}

	protected override void UpdateCursor(bool isCursorDefault, System.Drawing.Point point)
	{
 		//Display this navigator cursor.
 		if (isCursorDefault)
 		{
 			Viewer.RestoreCursorToDefault();
 			return;
 		}
 		Viewer.Cursor = _cursor;
	}

	private System.Windows.Forms.Cursor _cursor;		
}