/**
	 * Will open an image
	 */
	public void openFile(){
		JFileChooser c = new JFileChooser();		    
		if (c.showOpenDialog(canvas) == JFileChooser.APPROVE_OPTION)
		{
		       System.out.println("You chose to open this file: " +
		               c.getSelectedFile().getName());
		       File file = c.getSelectedFile();
		       // Get filename
		       String fileName = c.getSelectedFile().getName().toLowerCase();
		       // See if filename has correct extension
		       if(fileName.endsWith(".jpg") || fileName.endsWith(".jpeg") ||
		    		   fileName.endsWith(".gif") || fileName.endsWith(".bmp")
		    		   || fileName.endsWith(".png")){
		   		BufferedImage img = null;
				try {
				    img = ImageIO.read(file);
				    original = this.convertToGrayScale(img);
				    System.out.println("File Succesfully loaded");
				} catch (IOException exception) {
					System.out.println("Error while loading image");
				}
		       }
		       else{
		    	   System.out.println("Wrong File Extension");
		       }
		}
	}

	/**
	 * Will create and return a gray scale image of the given image
	 * @param img
	 * @return
	 */
	private BufferedImage convertToGrayScale(BufferedImage img) {
		int width = img.getWidth();
		int height = img.getHeight();
		BufferedImage grayImg = new BufferedImage(width, height,BufferedImage.TYPE_BYTE_GRAY);  
		Graphics g = grayImg.getGraphics();  
		g.drawImage(img, 0, 0, null);  
		g.dispose();  
		return grayImg;		
	}