Load and Resize Image [duplicate]

Question

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• Resizing an image in swing 4 answers

I am loading an image in Java Swing and want to display it in JPanel..The problem I am facing is that despite of image being loaded, it is not showing in JPanel..I can say that image is successfully loaded because it is showing me the correct path of the loaded image in my label..

Here is my code..

private static final int IMG_WIDTH = 120;
private static final int IMG_HEIGHT = 120;
JLabel label;
ImageIcon photo;
WritableRaster raster;
DataBufferByte data;
File image;

JFileChooser chooser;
FileNameExtensionFilter filter;
chooser = new JFileChooser();
chooser.setCurrentDirectory(image);
filter = new FileNameExtensionFilter("jpeg, gif and png files", "jpg", "gif", "png");
chooser.addChoosableFileFilter(filter);

int i = chooser.showOpenDialog(this);
if (i == JFileChooser.APPROVE_OPTION) {
    image = chooser.getSelectedFile();
    jLabel8.setText(image.getAbsolutePath());
    try {
        BufferedImage originalImage = ImageIO.read(image);
        int type = originalImage.getType() == 0 ? BufferedImage.TYPE_INT_ARGB : originalImage.getType();
        BufferedImage resizeImageJpg = resizeImage(originalImage, type);
        photo = new ImageIcon(toImage(resizeImageJpg));
        jPanel2.removeAll();
        label = new JLabel("", photo, JLabel.CENTER);
        label.setIcon(photo);
        jPanel2.add(label);
        setVisible(true);
            //converting buffered image to byte array
        raster = resizeImageJpg.getRaster();
        data = (DataBufferByte) raster.getDataBuffer();

     } catch (IOException e) {
            System.out.println(e.getMessage());
        }

        repaint();
        chooser.setCurrentDirectory(image);
    }

  public Image toImage(BufferedImage bufferedImage) {
    return Toolkit.getDefaultToolkit().createImage(bufferedImage.getSource());
}


private static BufferedImage resizeImage(BufferedImage originalImage, int type) {
    BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);
    Graphics2D g = resizedImage.createGraphics();
    g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null);
    g.dispose();

    return resizedImage;
}

Answer 1

First, forget the toImage() method, BufferedImage already extends the Image class.

Then try to use

    try {
        BufferedImage originalImage = ImageIO.read( image );
        int type = originalImage.getType() == 0 ? BufferedImage.TYPE_INT_ARGB : originalImage.getType();
        BufferedImage resizeImageJpg = resizeImage( originalImage, type );

        //forget the toImage() method, BufferedImage already extends the Image class.
        photo = new ImageIcon( resizeImageJpg );
        //And by the way, if you remove components and add new ones, use validate() instead.

        //And don't remove the JLabel, just change the icon, it will repaint automatically.
        label.setIcon(photo);
    }
    catch ( java.io.IOException iOException ) { 
        System.out.println(e.getMessage());
    }

And for the resized BufferedImage, use AffineTransform to scale the image to the new size.

private static BufferedImage resizeImage(BufferedImage originalImage, int type) {
    BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type);

    //Calculate de scale ratio;
    double scaledDx = ((IMG_WIDTH*1.0d)/originalImage.getWidth());
    double scaledDy = ((IMG_HEIGHT*1.0d)/originalImage.getHeight());

    AffineTransform resizeAffine = AffineTransform.getScaleInstance( scaledDx, scaledDy );
    BufferedImageOp buffResized = new AffineTransformOp( resizeAffine, null );

    Graphics2D g2 = resizedImage.createGraphics();
    g2.drawImage( resizedImage, buffResized, 0, 0 );
    g2.dispose(); //Don't forget to dispose to release resources.
}

I hope I could help.