new BufferedReader(new InputStreamReader(classLoader.getResourceAsStream("/path/to/resource")));

   private static final IndexColorModel createGreyscaleModel() {
      int SIZE = 256;
      byte[] r = new byte[SIZE];
      byte[] g = new byte[SIZE];
      byte[] b = new byte[SIZE];
      for (int i=0; i<SIZE; i++) {
         r[i] = g[i] = b[i] = (byte)i;
      }
      return new IndexColorModel(8, SIZE, r, g, b);
   }

   private static final BufferedImage createIndexedCopy(Image orig, IndexColorModel cm, int scale) {
      int w = orig.getWidth(null);
      int h = orig.getHeight(null);
      BufferedImage out = new BufferedImage(w*scale, h*scale, BufferedImage.TYPE_BYTE_INDEXED, cm);
      Graphics2D g2d = out.createGraphics();
//      g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
//      g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_DISABLE);
//      g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
//      g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
      g2d.drawImage(orig, 0, 0, w*scale, h*scale, null);
      g2d.dispose();
      return out;
   }

   // ...

   BufferedImage grayscaleImage = createIndexedCopy(otherImage, createGreyscaleModel(), 1);

   private static final IndexColorModel createGreenModel() {
      int SIZE = 256;
      byte[] r = new byte[SIZE];
      byte[] g = new byte[SIZE];
      byte[] b = new byte[SIZE];
      for (int i=0; i<SIZE; i++) {
         g[i] = (byte)i;
      }
      IndexColorModel model = new IndexColorModel(8, SIZE, r, g, b);
      return model;
   }

public Window() {
      JFrame mainFrame = new JFrame();
      mainFrame.setSize(1024, 786);
      mainFrame.setLocationRelativeTo(null); //Centers the window on the users screen.
      mainFrame.setTitle("Temp Name");
      mainFrame.setDefaultCloseOperation(EXIT_ON_CLOSE); 
      mainFrame.setResizable(false);
      insets = mainFrame.getInsets();
      mainFrame.getContentPane().setLayout(null);
      
      JTextArea gameTextArea = new JTextArea();
      gameTextArea.setEditable(false);
      gameTextArea.setBounds(50, 30, 100, 20); //X position, Y Position, Length in pixels, Height in pixels.
      mainFrame.getContentPane().add(gameTextArea);
      
      mainFrame.setVisible(true);
}

java -Xmx1024m ...