How can I merge 18 images to 1 images?

[Blood Bigsoon]

So hard!

[Ashish Hareet]

What do you want to do - make a composite image from a number of images ?

[Blood Bigsoon]

I just want to merge 18 images in to 1 images,just like 18 layers of a picture.

[Paul Stevens]

bigsoon
Welcome to the JavaRanch! Please adjust your display name to meet
the JavaRanch Naming Policy. You can change it here.
Thanks!
and welcome to the JavaRanch!

[Nathan Pruett]

bigsoon,

You need to describe what you are trying to do in more detail.

OK, you have 18 images and you want to create 1 image from them. In your second post you mention that you want to make them into layers... so I am assuming that each image has transparency in it and you are going to lay each of the images on top of the previous. Two more questions... are you actually trying to produce another *image file* from these images or are you just trying to *display* all of these images at the same time? And, are you using a greater than 1.4 JDK or an older version? (If you are trying to write out an image file, 1.4 added the ImageIO classes that make writing out image files easier.)

P.S. - Please change your displayed name as Paul suggested. (Thanks Paul! )

[Blood Bigsoon]

Thanks Nate.
And I want to make 18 transparent images lay each of the images on top of the previous and at last produce another *image file*.
I am newbie to java image(jdk1.4),so I don't know how to write the code.I had read more about java image in sun's web site,but too more to read!Pls help me,I just want the sample code,and learn it,thanks.
BTW,sorry for my error displayed name ,I had changed it.

[Nathan Pruett]

Here's a short example of how to save a new image from 8 other images layered on top of one another. This uses PNG format because the ImageIO classes support writing PNGs "out-of-the-box" and because they aren't "copywronged" like GIF format images. It assumes that your images are named "image_0.png", "image_1.png", etc.

import java.awt.Graphics;
import java.awt.MediaTracker;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
 
import javax.imageio.ImageIO;
 
public class LayeredImage {
 
    public static void main(String[] args) {
        
        // Array of input images.
        BufferedImage[] input = new BufferedImage[8];
        
        // Load each input image.
        // Assume they are called "image_0.png", "image_1.png",
        // etc.
        for ( int i = 0; i < input.length; i++ ) {
            try {
                File f = new File( "image_" + i + ".png" );
                input[i] = ImageIO.read( f );
            }
            catch ( IOException x ) {
                // Complain if there is any problem loading 
                // an input image.
                x.printStackTrace();
            }
        }
        
        // Create the output image.
        // It is the same size as the first
        // input image.  I had to specify the type
        // so it would keep it's transparency.
        BufferedImage output = new BufferedImage( 
                input[0].getWidth(), 
                input[0].getHeight(), 
                BufferedImage.TYPE_INT_ARGB );
        
        // Draw each of the input images onto the
        // output image.
        Graphics g = output.getGraphics();
        for ( int i = 0; i < input.length; i++ ) {
            g.drawImage( input[i], 0, 0, null );
        }
        
        // Create the output image file and write the
        // output image to it.
        File f = new File( "image.png" );
        try {
            ImageIO.write( output, "PNG", f );
        }
        catch ( IOException x ) {
            // Complain if there was any problem writing 
            // the output file.
            x.printStackTrace();
        }       
    }
}

P.S. - Your display name is still the same... You can can change it here.

[Blood Bigsoon]

Thx Nathan Pruett!
And I changed my display name which like a game character.Hoho,enjoy it!

[Ashish Hareet]

Hi,
Thought I'd put in a few lines aswell - this is for fading in the images -

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.image.*;
public class FaderTest extends JFrame{
    
    Toolkit toolKit = Toolkit.getDefaultToolkit();
    float alphaValue = 0.0f; // alphaValue = 0.0f to 1.0f
    boolean flag = true;
    Image image1,image2;
    
    public FaderTest(String str) {
        super(str);
        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent we){
                FaderTest.this.dispose();
                System.exit(0);
            }
        });
        setBounds(50,50,300,300);
        
        //Get the images
        image1 = toolKit.getImage("C:/images/i1.gif");
        image2 = toolKit.getImage("C:/images/i2.gif");
        
        //add images to tracker so we can wait while images are loaded
        MediaTracker tracker = new MediaTracker(this);
        tracker.addImage(image1,1);
        tracker.addImage(image2,2);
        
        //wait for images to load
        try{
            tracker.waitForID(1);
            tracker.waitForID(2);
        }catch(InterruptedException e){
            e.printStackTrace();
        }
        
        //get the container for this frame
        Container contentPane = this.getContentPane();
        
        //this is a derived JPanel where we do the custom painting
        // we just draw the images - the trick is in setting the alpha values
        //which happens in our thread
        JPanel imagePanel = new JPanel(){
            
            public void paintComponent(Graphics g){
                super.paintComponent(g);
                Graphics2D gX = (Graphics2D)g;                
                setBackground(Color.white);
                int rule = AlphaComposite.SRC_OVER;
                if(flag){
                    gX.setComposite(AlphaComposite.getInstance(rule,1-alphaValue));
                    gX.drawImage(image1,75,75,null);
                    gX.setComposite(AlphaComposite.getInstance(rule,alphaValue));
                    gX.drawImage(image2,75,75,null);
                }else if(!flag){                    
                    gX.setComposite(AlphaComposite.getInstance(rule,alphaValue));
                    gX.drawImage(image1,75,75,null);                    
                    gX.setComposite(AlphaComposite.getInstance(rule,1-alphaValue));
                    gX.drawImage(image2,75,75,null);
                }                
            }
        };
        
        //add our custom JPanel to the container of this frame
        contentPane.add(imagePanel);
        
        //you just keep changing the alpha values & keep calling repaint
        //this gives the effect that one is fading in while the other is fading out
        new Thread(new Runnable(){
            public void run(){
                while(true){
                    try{
                        alphaValue = (alphaValue < 0.99f) ? alphaValue+0.01f : 0.0f;
                        flag = (alphaValue == 0) ? !flag : flag;
                        alphaValue = (alphaValue == 0) ? 0.01f : alphaValue;
                        Thread.sleep(50);
                        repaint();
                    }catch(InterruptedException e){
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }
    
    public static void main(String args[]){
        JFrame f = new FaderTest("Test fading images");
        f.setVisible(true);
    }
}

HTH
Ashish H.
[ January 13, 2003: Message edited by: Ashish Hareet ]

[Blood Bigsoon]

Look my code,I always got a 0 bytes gif files.No exception catched.I don't know what happened.

package hello;
import java.lang.Long;
import java.awt.Graphics;
import java.awt.MediaTracker;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class Test {
     public static void main(String[] args) {
     // Array of input images.
     BufferedImage[] input = new BufferedImage[7];
     // Load each input image.
     // Assume they are called "image_0.png", "image_1.png",
     // etc.
     for ( int i = 0; i < input.length; i++ ) {
     try {
     File f = new File( "f:\\img\\image" + (i+1) + ".gif" );
     input[i] = ImageIO.read( f );
     }
     catch ( IOException x ) {
     // Complain if there is any problem loading
     // an input image.
     x.printStackTrace();
     }
     }
// Create the output image.
// It is the same size as the first
// input image.  I had to specify the type
// so it would keep it's transparency.
BufferedImage output = new BufferedImage(input[0].getWidth(),
input[0].getHeight(),BufferedImage.TYPE_INT_ARGB );
// Draw each of the input images onto the
// output image.
Graphics g = output.getGraphics();
for ( int i = 0; i < input.length; i++ ) {
g.drawImage( input[i], 0, 0, null );
}
// Create the output image file and write the
// output image to it.
File f = new File( "f:\\img\\soon.gif" );
try {
ImageIO.write( output, "gif", f );
}
catch ( IOException x ) {
// Complain if there was any problem writing
// the output file.
x.printStackTrace();
}
  }
}

[ January 13, 2003: Message edited by: Blood Bigsoon ]

[Nathan Pruett]

That's because you're trying to write it out as a GIF file. Due to legal reasons Sun would have to pay to use the compression techniques used to create GIF images. You can read a little about it here on JavaLobby.

The easiest way to fix it is to change the output file to a PNG image.