Finding the width and height of an image

Hi...
i have a path to an image "images/me.gif" and i'm trying to find its width and height.. am trying to use javax.swing.ImageIcon but it refuses to recognise the constructor with just the filename (string) parameter, and needs a URL to the file... anyone knows what i'm doing wrong??? is this the wrong class that i'm using...!??!?!?!?!?

String filename = "images/me.gif";
Image myImage = carregarImagem(filename);
System.out.println(myImage.getWidth(this));
System.out.println(myImage.getHeight(this));
* M�todo que carrega imagens na mem�ria, a partir da URL onde o
* applet est� sendo carregado. O uso de um 'mediaTracker' � fundamental para
* evitar problemas quanto � velocidade de carga de uma imagem. Se voc� n�o
* usar um mediaTracker, o seu c�digo pode tentar usar uma imagem antes dela
* estar plenamente carregada na mem�ria, o que causaria um erro de execu��o.
* @param nomeDaImagem O nome da imagem a ser carregada
* @return A imagem requisitada ou null caso n�o haja tal imagem na url do applet
public Image carregarImagem(String nomeDaImagem)
               try
                               Image imagem = getImage(getDocumentBase(), nomeDaImagem);
                               MediaTracker carregador = new MediaTracker(this);
                               carregador.addImage(imagem, 0);
                               carregador.waitForID(0);
                               return imagem;
               catch(Exception erro)
                               erro.printStackTrace();
                               System.exit(0);
                               return null;

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Losing width and height information of Image???

Hi,
I am losing the width and height information between converting an image to byte[] and then back to Image
public void testImageToBufferAndBack(Image takenImage){
BufferedImage bufimage = this.ImageToBufferedImage(takenImage);
System.out.println("buffimage"+bufimage.getWidth()+" "+bufimage.getHeight(null)); //works fine
ByteArrayOutputStream stream = new ByteArrayOutputStream();
try {
ImageIO.write(bufimage, "jpeg", stream);
catch (IOException ex) {
byte[] bytes = stream.toByteArray();
byte[] pictureBytes = bytes;
Image testImage = Toolkit.getDefaultToolkit().createImage(pictureBytes);;
System.out.println("tttttttteeeeeeeessssssttt "+testImage.getWidth(null)+" "+testImage.getHeight(null));
Output:
buffimage320 240
tttttttteeeeeeeessssssttt -1 -1
Could someone point me out my mistake please??

Your mistake is not realizing that java.awt.Image loads images asynchronously. When Toolkit's
createImage method returns an Image, that image contains no pixel data -- as you've seen above, it doesn't
even know the size of the image! I knew this was the behaviour of the createImage method that took a URL,
but was surprised here that this is also the case with the version that takes a byte[], but undoubtably, that is
what is happening here. The way to fix this is always the same: use a MediaTracker, as my demo below
illustrates.
A couple points:
1. If you render your image in a custom component like this it will eventually appear:
g.drawImage(image, x, y, this); //for exampleThat's because Component's default behaviour as an ImageObserver (the reason for the final this)
is to continually repaint as more pixel data becomes available. This is not always the best solution -- what
if you need to know the image's dimension sooner rather than later?
2. ImageIcon can load an image for you, by using a MediaTracker behind the scenes:
Image image = ...
new ImageIcon(image);
//now image is loaded...Just be aware that if you use its constructors that don't take Image, but for example URLs
URL url = ...
Image image = new ImageIcon(url).getImage();Behind the scenes it's first getting the Image with Toolkit's getImage (not createImage). Toolkit's
getImage caches the image, which may not be what you want if you are processing many images --
why have the image loiter in memory if there is no advantage to that?
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
public class Example {
    public static void main(String[] args) throws IOException {
        String url = "http://today.java.net/jag/bio/JagHeadshot-small.jpg";
        BufferedImage original = ImageIO.read(new URL(url));
        displayDimensions("original buffered image", original);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(original, "jpeg", out);
        byte[] bytes = out.toByteArray();
        Image image = Toolkit.getDefaultToolkit().createImage(bytes);
        displayDimensions("created image", image);
        loadImage(image, new Label()); //any component will do
        displayDimensions("loaded image", image);
        System.exit(0);
    //handy dandy utility method
    public static void loadImage(Image image, Component comp) throws IOException {
        MediaTracker mt = new MediaTracker(comp);
        mt.addImage(image, 0);
        try {
            mt.waitForID(0);
        } catch (InterruptedException e) {
            throw new RuntimeException("Unexpected", e);
        if (mt.isErrorID(0))
            throw new IOException("Error during image loading");
    static void displayDimensions(String msg, Image image) {
        System.out.println(msg + ", w=" + image.getWidth(null) + ", h=" + image.getHeight(null));
}Output:
original buffered image, w=235, h=240
created image, w=-1, h=-1
loaded image, w=235, h=240

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Message was edited by:
WebService

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I have some TIFF images (sorry, I cannot post them b/c of there confidential nature) that are returning the incorrect values for the width and height. I am using Image.getWidth(null) and have tried the relevant methods from BufferedImage. When I open the same files in external viewers (Irfanview, MS Office Document Imaging) they look fine and report the "correct" dimensions. When I re-save the files, my code works fine. Obviously, there is something wrong with the files, but why would the Java code fail and not the external viewers? Is there some way I can detect file problems?
Here is the code, the relevant section is in the print() routine.
* ImagePrinter.java
* Created on Feb 27, 2008
* Created by tso1207
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.print.PageFormat;
import java.awt.print.PrinterException;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.FileImageInputStream;
import javax.imageio.stream.ImageInputStream;
import com.shelter.io.FileTypeIdentifier;
public class ImagePrinter extends FilePrintable
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 private final int _pageCount;
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 private Image _image = null;
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 private int _imgHeight = 0;
 private int _currentPage = -1;
 public ImagePrinter(File imageFile) throws IOException
 super(imageFile);
 ImageInputStream fis = new FileImageInputStream(getFile());
 Iterator readerIter = ImageIO.getImageReaders(fis);
 ImageReader reader = null;
 while (readerIter.hasNext())
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 reader.setInput(fis);
 _reader = reader;
 int pageCount = 1;
 String mimeType = FileTypeIdentifier.getMimeType(imageFile, true);
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 pageCount = reader.getNumImages(true);
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 _pageCount = pageCount;
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 throws java.awt.print.PrinterException
 int drawX = 0, drawY = 0;
 double scaleRatio = 1;
 if (getCurrentPage() != (pageIndex - getPageOffset()))
 try
 setCurrentPage(pageIndex - getPageOffset());
 setImage(_reader.read(getCurrentPage()));
 setImgWidth(getImage().getWidth(null));
 setImgHeight(getImage().getHeight(null));
 catch (IndexOutOfBoundsException e)
 return NO_SUCH_PAGE;
 catch (IOException e)
 throw new PrinterException(e.getLocalizedMessage());
 if (!_isTiff && getImgWidth() > getImgHeight())
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 g2.translate(pf.getImageableX(), pf.getImageableY());
 g2.setClip(0, 0, (int) pf.getImageableWidth(), (int) pf.getImageableHeight());
 scaleRatio =
 (double) ((getImgWidth() > getImgHeight())
 ? (pf.getImageableWidth() / getImgWidth())
 : (pf.getImageableHeight() / getImgHeight()));
 //check the scale ratio to make sure that we will not write something off the page
 if ((getImgWidth() * scaleRatio) > pf.getImageableWidth())
 scaleRatio = (pf.getImageableWidth() / getImgWidth());
 else if ((getImgHeight() * scaleRatio) > pf.getImageableHeight())
 scaleRatio = (pf.getImageableHeight() / getImgHeight());
 int drawWidth = getImgWidth();
 int drawHeight = getImgHeight();
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 drawY = (int) ((pf.getImageableHeight() - (getImgHeight() * scaleRatio)) / 2);
 drawWidth = (int) (getImgWidth() * scaleRatio);
 drawHeight = (int) (getImgHeight() * scaleRatio);
 else
 drawX = (int) (pf.getImageableWidth() - getImgWidth()) / 2;
 drawY = (int) (pf.getImageableHeight() - getImgHeight()) / 2;
 g2.drawImage(getImage(), drawX, drawY, drawWidth, drawHeight, null);
 g2.dispose();
 return PAGE_EXISTS;
 * 
 * Created By: TSO1207 - John Loyd
 * @since version XXX
 * @return
 public int getPageCount()
 return _pageCount;
 public void destroy()
 setImage(null);
 try
 _reader.reset();
 _reader.dispose();
 catch (Exception e)
 System.gc();
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
 * @return
 public Image getImage()
 return _image;
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
 * @return
 public int getImgHeight()
 return _imgHeight;
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
 * @return
 public int getImgWidth()
 return _imgWidth;
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
 * @param image
 public void setImage(Image image)
 _image = image;
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
 * @param i
 public void setImgHeight(int i)
 _imgHeight = i;
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
 * @param i
 public void setImgWidth(int i)
 _imgWidth = i;
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
 * @return
 public int getCurrentPage()
 return _currentPage;
 * 
 * Created By: TSO1207 - John Loyd
 * @since Mar 25, 2008
 * @param i
 public void setCurrentPage(int i)
 _currentPage = i;
}Edited by: jloyd01 on Jul 3, 2008 8:26 AM

Figured it out. The files have a different vertical and horizontal resolutions. In this case the horizontal resolution is 200 DPI and the vertical is 100 DPI. The imgage width and height values are based on those resolution values. I wrote a section of code to take care of the problem (at least for TIFF 6.0)
 private void setPageSize(int pageNum) throws IOException
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 double xRes = ifd.getTIFFField(282).getAsDouble(0);
 double yres = ifd.getTIFFField(283).getAsDouble(0);
 int resUnits = ifd.getTIFFField(296).getAsInt(0);
 double imageWidth = xPixles / xRes;
 double imageHeight = yPixles / yres;
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Images with width and height

There is a way to insert an image inside of the html code
with width and height already? I mean, now, if I want to insert an
image at the code, goes only <img src="images/test.gif" /> I
d like that if I insert an image it goes as: <img
src="images/canto_topo.gif" width="8" height="29" />
is possible in dreamwaver to do that?
Thanks!
Vismona

If you insert the image using the "Insert Image" function, DW
will
automatically insert the width and height.
Or, if you'd rather insert them the way you are, in the
Property Inspector
on the far left, click the dimensions next to the Image
field, and DW will
automatically add (or correct) the width and height.
Hope that helps,
Patty Ayers | www.WebDevBiz.com
Free Articles on the Business of Web Development
Web Design Contract, Estimate Request Form, Estimate
Worksheet
"Vismona" <[email protected]> wrote in
message
news:gc60ut$nmv$[email protected]..
> There is a way to insert an image inside of the html
code with width and
> height
> already? I mean, now, if I want to insert an image at
the code, goes only
> <img
> src="images/test.gif" /> I d like that if I insert an
image it goes as:
> <img
> src="images/canto_topo.gif" width="8" height="29" />
>
> is possible in dreamwaver to do that?
>
> Thanks!
> Vismona
>

Finding the width and height of an image

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