if (ox+x >= image.getWidth() || oy+y >= image.getHeight()) return 0;
	public int getGrayscaleValue(int x, int y) {		//System.out.println("x = " + x + " y = " + y + " w = " + getWidth() + " h = " + getHeight());		return image.getGrayscaleValue(ox+x, oy+y);	}