Seperate animated GIF frames

> What am thinking is there must be a way of opening that file in a text format.

<cringe/> A GIF file is not a text file.

OP: You didn't look very hard at package javax.imageio. ImageReader has methods getNumImages and read(imageIndex):

import java.awt.*;

import java.awt.image.*;

import java.io.*;

import java.net.*;

import java.util.*;

import javax.imageio.*;

import javax.swing.*;

import java.util.List;

public class ImageListExample implements Runnable {

public void run() {

List < BufferedImage > images = getImages();

JPanel p = new JPanel(new GridLayout(0,4));

for(BufferedImage image : images) {

JLabel label = new JLabel(new ImageIcon(image));

label.setBorder(BorderFactory.createEtchedBorder());

p.add(label);

}

JFrame f = new JFrame("ImageListExample");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(p);

f.pack();

f.setLocationRelativeTo(null);

f.setVisible(true);

}

List < BufferedImage > getImages() {

List < BufferedImage > images = new ArrayList < BufferedImage > ();

try {

URL url = new URL("http://www.cs.princeton.edu/introcs/15inout/duke.gif");

ImageReader reader = ImageIO.getImageReadersBySuffix("gif").next();

reader.setInput(ImageIO.createImageInputStream(url.openStream()));

int ub = reader.getNumImages(true);

for(int i = 0; i < ub; ++i)

images.add(reader.read(i));

} catch (IOException e) {

throw new RuntimeException(e);

}

return images;

}

public static void main(String[] args) {

EventQueue.invokeLater(new ImageListExample());

}

}

Hippolytea at 2007-7-12 18:03:32 >

It seems that frames after the first one only contain the section of the image that has actually been updated, much like most video formats. However, the method that I se for getting the offset of each frame, ImageReader.getTileGridXOffset(int) and ImageReader.getTileGridYOffset(int) always seem to return 0, making it impossible to re-create the animation.

keeskista at 2007-7-12 18:03:32 >