public String toString() {
		String[] colors = { "Rot", "Gruen", "Blau" };
		String result = "";
		for (int c = 0; c < 3; c++) {
			result += "Die " + colors[c] + "-Werte des Bildes: \n";
			for (int x = 1; x <= width; x++) {
				for (int y = 1; y <= height; y++) {
					result += Math.round(getPixel(x, y, c) * 1000) / 1000.0
							+ "\t";
				}
				result += "\n";
			}
			result += "\n";
		}
		return result;
	}