Saving an array to JPG or GIF file format

Posted on 2003-02-23
Medium Priority
Last Modified: 2013-11-19
I have a program where I have to locate a sub-image within a larger image.  I open the image files and convert them to 3D arrays, manipulate the images.  I have figured out how to save to bmp, but really need to save the image to jpg format.  I can supply the image in either a 3D array [col][row][32 bit color] or 2D array [index][32 bit color] or 1D array of 32 bit colors.  How do I save any of these to a jpg file format, whatever is easier.  This may seem trivial but I am not a JAVA programmer, please help!
Question by:ssche2bu
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1 Comment
LVL 86

Accepted Solution

CEHJ earned 60 total points
ID: 8003235
This contains the code you'd need for that:

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import java.awt.*;
import java.awt.image.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;

public class Shape2Jpeg {

  public static void main(String[] args){
    JFrame f = new JFrame();
    f.getContentPane().add(new ShapePanel());
    f.setSize(300, 200);


class ShapePanel extends JPanel implements MouseListener {
  boolean highlighted;
  Shape shape;
  Paint normalPaint;
  BufferedImage imageJpeg;
  Graphics2D g2dJpeg;

  public ShapePanel() {
    shape = new Rectangle2D.Float(0.f, 0.f, 100.f, 50.f);
    // Create image to save as Jpeg
    imageJpeg = new BufferedImage(shape.getBounds().width, shape.getBounds().height, BufferedImage.TYPE_INT_RGB);
    g2dJpeg = imageJpeg.createGraphics();
    normalPaint = Color.red;

  public void paintComponent(Graphics _g) {
    Graphics2D g = (Graphics2D)_g;

  public void mouseClicked(MouseEvent e) {
    // Save shape as Jpeg
    try {
      // draw the shape to the Jpeg image
      FileOutputStream in = new FileOutputStream("shape.jpg");
      JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(in);
    catch (IOException ex) {


  public void mouseEntered(MouseEvent e) {}
  public void mouseExited(MouseEvent e) {}
  public void mousePressed(MouseEvent e) {}
  public void mouseReleased(MouseEvent e) {}


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