if (hasAlpha() && isAlphaPremultiplied())
if (hasAlpha() && isAlphaPremultiplied() && getAlpha(pixel) != 0)
  private int extractAndNormalizeSample(int pixel, int component)  {		int value = extractAndScaleSample(pixel, component);		if (hasAlpha() && isAlphaPremultiplied())      value = value*255/getAlpha(pixel);		return value;	}