code: public static BufferedImage createTracedImage (
          ImageCreator isrc, BufferedImage src, Color tcolor, int thickness,
          float startAlpha, float endAlpha)
      {
          // create the destination image
          int wid = src.getWidth(), hei = src.getHeight();
          BufferedImage dest = isrc.createImage(wid, hei, Transparency.TRANSLUCENT);
          return createTracedImage(src, dest, tcolor, thickness, startAlpha, endAlpha);
      }
docs: Creates and returns a new image consisting of the supplied image traced with the given
  color, thickness and alpha transparency.