File chooser to buffered image

Question

Hi all,
Sorry about the total newbie question; I'm trying to figure out how to convert a jpg into a buffered image, while using the file chooser to select it. I'd like to do all this in a scrollpane. Does anyone have some sample code for this, at least so I can play around? I have ideas, but I'm getting tons of errors while trying things like:
public class ImProc extends JComponent{
private BufferedImage source, destination;
private JComboBox options;
public ImProc( BufferedImage image){
source = destination = image;
setBackground(Color.white);
setLayout( new BorderLayout());
JPanel controls = new JPanel();
options = new JComboBox(
new String[] {"[source]", "brighten", "darken", "rotate", "scale" }
options.addItemListener(new ItemListener(){
public void itemStateChanged( ItemEvent ie){
String option = (String)options.getSelectedItem();
BufferedImageOp op = null;
if(option.equals("[source]"))
destination = source;
else if(option.equals("brighten"))
op = new RescaleOp(1.5f, 0, null);
else if(option.equals("darken"))
op = new RescaleOp(0.5f, 0, null);
else if (option.equals("rotate"))
op = new AffineTransformOp(
AffineTransform.getRotateInstance(Math.PI / 6), null);
else if (option.equals("scale"))
op = new AffineTransformOp(
AffineTransform.getScaleInstance(.5, .5), null);
if(op != null) destination = op.filter(source, null);
repaint();
controls.add(options);
add(controls, BorderLayout.SOUTH);
public void paintComponent(Graphics g){
int imageWidth = destination.getWidth();
int imageHeight = destination.getHeight();
int width = getSize().width;
int height = getSize().height;
g.drawImage(destination,
(width - imageWidth) / 2, (height - imageHeight) / 2, null);
public static void main(String[] args){
JFileChooser chooser = new JFileChooser();
String filename = chooser.getName();
ImageIcon icon = new ImageIcon(filename);
Image i = icon.getImage();
int w = i.getWidth(null), h = i.getHeight(null);
BufferedImage buffImage = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
Graphics2D imageGraphics = buffImage.createGraphics();
imageGraphics.drawImage(i, 0, 0, null);
JFrame frame = new JFrame("Image");
frame.getContentPane().add(new ImProc(buffImage));
frame.setSize(buffImage.getWidth(), buffImage.getHeight());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
So, I'm stuck. Any help from anyone is appreciated.
Thanks,
Joe

Answer 1

Now, with:
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.*;
import javax.imageio.*;
public class ImProc extends JComponent{
private BufferedImage source, destination;
private JComboBox options;
public ImProc( BufferedImage image){
source = destination = image;
setBackground(Color.white);
setLayout( new BorderLayout());
JPanel controls = new JPanel();
options = new JComboBox(
new String[] {"[source]", "brighten", "darken", "rotate", "scale" }
options.addItemListener(new ItemListener(){
public void itemStateChanged( ItemEvent ie){
String option = (String)options.getSelectedItem();
BufferedImageOp op = null;
if(option.equals("[source]"))
destination = source;
else if(option.equals("brighten"))
op = new RescaleOp(1.5f, 0, null);
else if(option.equals("darken"))
op = new RescaleOp(0.5f, 0, null);
else if (option.equals("rotate"))
op = new AffineTransformOp(
AffineTransform.getRotateInstance(Math.PI / 6), null);
else if (option.equals("scale"))
op = new AffineTransformOp(
AffineTransform.getScaleInstance(.5, .5), null);
if(op != null) destination = op.filter(source, null);
repaint();
controls.add(options);
add(controls, BorderLayout.SOUTH);
public void paintComponent(Graphics g){
int imageWidth = destination.getWidth();
int imageHeight = destination.getHeight();
int width = getSize().width;
int height = getSize().height;
g.drawImage(destination,
(width - imageWidth) / 2, (height - imageHeight) / 2, null);
public static void main(String[] args){
JFrame frame = new JFrame("Image");
frame.setSize(300, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
JFileChooser chooser = new JFileChooser();
//String filename = chooser.getName();
File f = chooser.getSelectedFile();
//String filename = f.getName();
//ImageIcon icon = new ImageIcon(filename);
//Image i = ImageIO.read(f);
//int w = i.getWidth(null), h = i.getHeight(null);
//BufferedImage buffImage = null;
try{
BufferedImage buffImage = ImageIO.read(f);
catch (IOException e){
System.out.println("Error: " + e.getMessage());
frame.getContentPane().add(new ImProc(buffImage));
Graphics2D imageGraphics = buffImage.createGraphics();
imageGraphics.drawImage(buffImage, 0, 0, null);
With this, it doesn't seem to find my variable buffImage. However, it complains if I don't use the try{} catch{}. Am I not declaring something properly?