Java/ImageIO getting image dimensions without reading the entire file?

dimensions, image, java, javax.imageio

Solution

try(ImageInputStream in = ImageIO.createImageInputStream(resourceFile)){
    final Iterator<ImageReader> readers = ImageIO.getImageReaders(in);
    if (readers.hasNext()) {
        ImageReader reader = readers.next();
        try {
            reader.setInput(in);
            return new Dimension(reader.getWidth(0), reader.getHeight(0));
        } finally {
            reader.dispose();
        }
    }
}

Thanks to sfussenegger for the suggestion

Problem

Is there a way to get the dimensions of an image without reading the entire file? ``` URL url=new URL(<BIG_IMAGE_URL>); BufferedImage img=ImageIO.read(url); System.out.println(img.getWidth()+" "+img.getHeight()); img=null; ```

Original source

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