// static version of doTransform which is used to redo this filter
	public static BufferedImage redoTransform(BufferedImage src,
			BufferedImage dest, int blurRadius, float opacity) {
		{
			dest = ImageUtils.copyImage(src);
			ImageUtils.screenWithItself(dest, opacity);

			BufferedImage blurredMultiplied = ImageUtils.copyImage(dest);

			if (blurRadius > 0) {
				BoxBlurFilter boxBlur = new BoxBlurFilter(blurRadius,
						blurRadius, 3);
				blurredMultiplied = boxBlur.filter(blurredMultiplied,
						blurredMultiplied);
			}

			Graphics2D g = dest.createGraphics();
			g.setComposite(new MultiplyComposite(opacity));
			g.drawImage(blurredMultiplied, 0, 0, null);
			g.dispose();

			return dest;
		}
	}