Resizing a gif

[Julien Martin]

Hello,
I have the following piece of code and it does not work with GIFs. It simply produces a 0ko image. It works fine with JPGs.

public static void main(String[] args) throws MalformedURLException, IOException {
   
        BufferedImage bi3 =   ImageIO.read(new File("E:\\Divers\\topirREP.gif"));
        
        System.out.println(bi3.getType());
       
        System.out.println("width:" + bi3.getWidth());
        System.out.println("height:" + bi3.getHeight());    
 
        Image img = bi3.getScaledInstance(460, 60, Image.SCALE_SMOOTH);
    
        System.out.println("width:" + img.getWidth(null));
        System.out.println("height:" + img.getHeight(null));
        
        BufferedImage bi_new;
        bi_new = new BufferedImage( img.getWidth(null),img.getHeight(null), 13);//??1
        Graphics2D g2 = bi_new.createGraphics();
        g2.drawImage(img, null, null);
        
        ImageIO.write(bi_new, "gif", new File("E:\\Divers\\new.gif"));
       
     }
     

[Jeff Albertson]

ImageIO.write returns a boolean indicating success/failure. If you had checked it you would see false here. The J2SE ships with a GIF reader but not a GIF writer. That's because of copywrite issues some time ago, but the copywrite has since expired. There are several 3rd party gif writers out there: google for them. You can also download and install Sun's JAI Java(TM) Image I/O API which provides more reader/writer plug-ins for ImageIO. In the documentation for it:

http://java.sun.com/products/java-media/jai/forDevelopers/jai-imageio-1_0_01-fcs-docs/index.html

It states:

An ImageWriter plug-in is provided for the Graphics Interchange Format (GIF). Animated GIF images may be created using the standard sequence writing methods defined in ImageWriter. By default the writer creates version "89a" images.

[ February 09, 2006: Message edited by: Jeff Albertson ]