Get Image Width and Height in Java

Question

I just want to ask how to get the width and height of an image, because this returns -1 for width and height:

private void resizeImage(Image image){
    JLabel imageLabel = new JLabel();

    int imageWidth = image.getWidth(null);
    int imageHeight = image.getHeight(null);
    System.out.println("Width:" + imageWidth);
    System.out.println("Height:" + imageHeight);
}

Answer 1

You should do something like this :

BufferedImage bimg = ImageIO.read(new File(filename));
int width          = bimg.getWidth();
int height         = bimg.getHeight(); 

as this post says

Answer 2

With Apache Commons Imaging, you can get image width and height with better performance, without reading entire image to memory.

Sample code below is using Sanselan 0.97-incubator (Commons Imaging is still SNAPSHOT as I write this):

final ImageInfo imageInfo = Sanselan.getImageInfo(imageData);
int imgWidth = imageInfo.getWidth();
int imgHeight = imageInfo.getHeight();