How to find out resolution of an image?

Hi, all
Most common image formats (DIB, JPEG, PNG, TIFF and perhaps others) store the resolution of the image in pixels per inch (or other, similar units). I haven't found a way to find out this information using the Java libraries. Neither the AWT image classes nor the snazzy JAI classes seem to read & store this information, let alone make it public.
Is there a way to determine the resolution, short of poking through the header of the image data myself?
Thanks
- rick

Here's the solution (hopefully no one else ever has to track it down - the documentation is very well hidden by Sun).
                         ImageInputStream imageInput = ImageIO.createImageInputStream( fil );
                         Iterator it = ImageIO.getImageReaders(imageInput);
                         ImageReader reader = null;
                         while (it.hasNext()) {
                              reader = (ImageReader) it.next();
                              System.out.println(reader.toString());
                         reader.setInput(imageInput);
                         ImageReadParam param = reader.getDefaultReadParam();
                         BufferedImage bimg = reader.read(0, param);
                         IIOMetadata meta = reader.getImageMetadata(0);
                         org.w3c.dom.Node n = meta.getAsTree( "javax_imageio_1.0" );
                         n = n.getFirstChild();
                         while (n != null){
                              if( n.getNodeName().equals( "Dimension")){
                                   org.w3c.dom.Node n2 = n.getFirstChild();
                                   String s1, s2;
                                   while (n2 != null){
                                        if(n2.getNodeName().equals("HorizontalPixelSize")){
                                             org.w3c.dom.NamedNodeMap nnm = n2.getAttributes();
                                             org.w3c.dom.Node n3 = nnm.item( 0 );
                                             float hps = Float.parseFloat( n3.getNodeValue() );
                                             xDPI = Math.round (25.4f / hps);
                                        if(n2.getNodeName().equals("VerticalPixelSize")){
                                             org.w3c.dom.NamedNodeMap nnm = n2.getAttributes();
                                             org.w3c.dom.Node n3 = nnm.item( 0 );
                                             float vps = Float.parseFloat( n3.getNodeValue() );
                                             yDPI = Math.round (25.4f / vps);
                                        n2 = n2.getNextSibling();
                              n = n.getNextSibling();
                         }

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