[java] transparentnost

BufferedImage image1;
try {
   FileInputStream in = new FileInputStream("c:/14.jpg");
   JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in);
   image1 = decoder.decodeAsBufferedImage();
   in.close();
} catch (Exception e) {}

for (int i=0; i < image1.getWidth(); i++) {
   for(int j=0; j < image1.getHeight(); j++){
      int rgba = image1.getRGB(i,j); 
      int red = (rgba >> 16) & 0xff;
      int green = (rgba >>  8) & 0xff;
      int blue = rgba & 0xff;
      int alpha = (rgba  >>  24) & 0xff;	
      alpha=30;    //0-225				
     rgba = (alpha  ** 24) | (red ** 16) | (green ** 8) | blue;  // * pomeni  manjsi
      image1.setRGB(i,j,rgba);
   }
} 
... //izris slike