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thumbnail images in java

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Name: Wale A
Date: November 2, 2004 at 20:02:56 Pacific
OS: win 2000 pro
CPU/Ram: 512/1.2Ghz
Comment:

Hi

I am writing a java applet, and i need to load photos into my applet. I am using the ImageIcon object to load my images, the problem is that i need to resize these images to thumnail sizes, anyone know how to do this in java, thanks?



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Response Number 1
Name: seanhaggerty
Date: November 18, 2004 at 09:35:57 Pacific
Reply:

Here's some code:

import com.sun.image.codec.jpeg.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;

Thumbnail thumb = new Thumbnail( "c:\\mises.jpeg" , "c:\\thumbvon.jpeg" , "30" , "30" , "75" );

public class Thumbnail {
//args ( image_name_to_thumb , thumb_name , thumbHeight , thumbWidth , 0_to_100_Quality_parameter )
public Thumbnail( String[] args ) throws Exception{
try{
main(args);
} catch (Exception e) {
}
}
public Thumbnail( String imageName , String thumbName , String thumbHeight , String thumbWidth , String Quality ) throws Exception{
try{
String[] args = {imageName , thumbName , thumbHeight , thumbWidth , Quality };
main(args);
} catch (Exception e) {
}
}
public static void main(String[] args) throws Exception {
if (args.length != 5) {
System.err.println("Usage: java Thumbnail INFILE OUTFILE WIDTH HEIGHT QUALITY");
System.exit(1);
}
// load image from INFILE
Image image = Toolkit.getDefaultToolkit().getImage(args[0]);
MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.addImage(image, 0);
mediaTracker.waitForID(0);
// determine thumbnail size from WIDTH and HEIGHT
int thumbWidth = Integer.parseInt(args[2]);
int thumbHeight = Integer.parseInt(args[3]);
double thumbRatio = (double)thumbWidth / (double)thumbHeight;
int imageWidth = image.getWidth(null);
int imageHeight = image.getHeight(null);
double imageRatio = (double)imageWidth / (double)imageHeight;
if (thumbRatio < imageRatio) {
thumbHeight = (int)(thumbWidth / imageRatio);
} else {
thumbWidth = (int)(thumbHeight * imageRatio);
}
// draw original image to thumbnail image object and
// scale it to the new size on-the-fly
BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = thumbImage.createGraphics();
// for nicer results try RenderingHints.VALUE_INTERPOLATION_BICUBIC
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
// save thumbnail image to OUTFILE
BufferedOutputStream out = new BufferedOutputStream(new
FileOutputStream(args[1]));
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.
getDefaultJPEGEncodeParam(thumbImage);
int quality = Integer.parseInt(args[4]);
quality = Math.max(0, Math.min(quality, 100));
param.setQuality((float)quality / 100.0f, false);
encoder.setJPEGEncodeParam(param);
encoder.encode(thumbImage);
out.close();
System.out.println("Done.");
System.exit(0);
}
}


import java.awt.*;
import java.awt.event.*;

public class Viewer extends Frame {
private Image image;

public Viewer(String fileName) {
Toolkit toolkit = Toolkit.getDefaultToolkit();
image = toolkit.getImage(fileName);
MediaTracker mediaTracker = new MediaTracker(this);
mediaTracker.addImage(image, 0);
try
{
mediaTracker.waitForID(0);
}
catch (InterruptedException ie)
{
System.err.println(ie);
System.exit(1);
}
addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});
setSize(image.getWidth(null), image.getHeight(null));
setTitle(fileName);
show();
}

public void paint(Graphics graphics) {
graphics.drawImage(image, 0, 0, null);
}

public static void main(String[] args) {
new Viewer(args[0]);
}

}


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