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    <p>OK managed to get the basics working,</p> <p>I used the link from Ewald, thanks mate!</p> <p>Here's the working code (just change the 'iphone4' image path to an image of your choice):</p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.ImageIcon; import java.awt.image.BufferedImage; import java.awt.image.FilteredImageSource; import java.awt.image.ImageFilter; import java.awt.image.ImageProducer; import java.awt.image.RGBImageFilter; import java.awt.Toolkit; import java.io.File; import javax.imageio.ImageIO; import java.awt.Stroke; import java.awt.BasicStroke; import java.awt.AlphaComposite; public class Main { public static void main(String[] args) { JFrame frame = new JFrame(); final DrawPad drawPad = new DrawPad(); frame.add(drawPad, BorderLayout.CENTER); JButton clearButton = new JButton("New Scratch-Card"); clearButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { drawPad.clear(); } }); frame.add(clearButton, BorderLayout.SOUTH); frame.setSize(500, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } class DrawPad extends JComponent { BufferedImage image; BufferedImage card_surface; Graphics2D graphics2D; int currentX, currentY, oldX, oldY; public DrawPad() { final Stroke stroke = new BasicStroke (17.0F, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL); setDoubleBuffered(false); addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent e) { oldX = e.getX(); oldY = e.getY(); } }); addMouseMotionListener(new MouseMotionAdapter() { public void mouseDragged(MouseEvent e) { currentX = e.getX(); currentY = e.getY(); if (graphics2D != null){ graphics2D.setStroke(stroke); graphics2D.setPaint(Color.GRAY); //graphics2D.setComposite(makeComposite(0.5F)); graphics2D.drawLine(oldX, oldY, currentX, currentY); repaint(); oldX = currentX; oldY = currentY; } } }); } private AlphaComposite makeComposite(float alpha) { int type = AlphaComposite.SRC_OVER; return(AlphaComposite.getInstance(type, alpha)); } private Image TransformColorToTransparency(BufferedImage image, Color c1, Color c2) { // Primitive test, just an example final int r1 = c1.getRed(); final int g1 = c1.getGreen(); final int b1 = c1.getBlue(); final int r2 = c2.getRed(); final int g2 = c2.getGreen(); final int b2 = c2.getBlue(); ImageFilter filter = new RGBImageFilter() { public final int filterRGB(int x, int y, int rgb) { int r = (rgb &amp; 0xFF0000) &gt;&gt; 16; int g = (rgb &amp; 0xFF00) &gt;&gt; 8; int b = rgb &amp; 0xFF; if (r &gt;= r1 &amp;&amp; r &lt;= r2 &amp;&amp; g &gt;= g1 &amp;&amp; g &lt;= g2 &amp;&amp; b &gt;= b1 &amp;&amp; b &lt;= b2) { // Set fully transparent but keep color return rgb &amp; 0xFFFFFF; } return rgb; } }; ImageProducer ip = new FilteredImageSource(image.getSource(), filter); return Toolkit.getDefaultToolkit().createImage(ip); } private BufferedImage ImageToBufferedImage(Image image2, int width, int height) { BufferedImage dest = new BufferedImage( width, height, BufferedImage.TYPE_INT_ARGB); Graphics2D g2 = dest.createGraphics(); //g2.drawImage(image, 0, 0, null); g2.drawImage(image2, 0, 0, null); //g2.dispose(); return dest; } public void clear() { image=null; card_surface=null; repaint(); } public void paintComponent(Graphics g) { if (image == null) { image = new BufferedImage(500, 300, BufferedImage.TYPE_INT_ARGB); String imagePath = "iPhone-4-Pattern-Wallpaper-07.jpg"; File inFile = new File(imagePath); try{ image = ImageIO.read(inFile); }catch(java.io.IOException e){System.out.println(e);} graphics2D = image.createGraphics(); //image = new ImageIcon().getImage(""); //image = createImage(getSize().width, getSize().height); //graphics2D = (Graphics2D) image.getGraphics(); graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); //graphics2D.setPaint(Color.white); // graphics2D.fillRect(0, 0, getSize().width, getSize().height); // graphics2D.setPaint(Color.black); repaint(); } if (card_surface == null) { card_surface = new BufferedImage(500, 300, BufferedImage.TYPE_INT_ARGB); graphics2D = (Graphics2D) card_surface.getGraphics(); graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); graphics2D.setPaint(Color.green); graphics2D.fillRect(0, 0, getSize().width, getSize().height); repaint(); } g.drawImage(image, 0, 0, null); g.drawImage(card_surface, 0, 0, null); Image transpImg2 = TransformColorToTransparency(card_surface, new Color(0, 50, 77), new Color(200, 200, 255)); BufferedImage resultImage2 = ImageToBufferedImage(transpImg2, image.getWidth(), image.getHeight()); g.drawImage(image, 0, 0, null); g.drawImage(resultImage2, 0, 0, null); /* File outFile2 = new File("map_with_transparency2.png"); try{ ImageIO.write(resultImage2, "PNG", outFile2); }catch(Exception e){System.out.println(e);} //card_surface = (BufferedImage)transpImg2; */ } } </code></pre>
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    1. POJava Scratch Card demo
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    1. COHere's a look at a well polished app I made which uses this code as its basis: http://www.splashportal.net/scratchCard/ :))))))))
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