code: public static byte[] compress(byte[] data, int width, int height) {
          CCITTG4Encoder g4 = new CCITTG4Encoder(width);
          g4.fax4Encode(data, 0, g4.rowbytes * height);
          return g4.close();
      }
docs: Encodes a full image.
  @param data the data to encode
  @param width the image width
  @param height the image height
  @return the encoded image