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

Question

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; 

Answer 1

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