Image width/height without loading file into JVM?

Question

How do we find the width/height of an image, without loading the image into the JVM? Also it would be nice to to obtain the height/width without creating any new objects(from which i would obtain the height and width).
Thanks
Tapan
Edited by: tapanmokha on Jan 27, 2009 8:03 AM

Answer 1

ImageInputStream imageStream =
        ImageIO.createImageInputStream(location);
java.util.Iterator<ImageReader> readers =
        ImageIO.getImageReaders(imageStream);
ImageReader reader = null;
if(readers.hasNext()) {
    reader = readers.next();
}else {
    imageStream.close();
    //can't read image format... what do you want to do about it,
    //throw an exception, return ?
reader.setInput(imageStream,true,true);
int imageWidth = reader.getWidth(0);
int imageHeight = reader.getHeight(0);
reader.dispose();
imageStream.close();