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Posted to users@tapestry.apache.org by Jeff LaMarche <je...@mac.com> on 2005/02/09 14:47:05 UTC

Thumbnailing...

In a tapestry app I'm working on, I allow users to upload images. I 
then create a thumbnail of the image using a utility class I've 
written. I've searched online for other pure Java thumbnail solutions, 
and they all seem to use the same approach that I use.

The problem with these approaches is that the default Toolkit can 
create an Image from a file, but not (seemingly) a BufferedImage. 
Therefore, I need to create an Image then create a Buffered Image from 
that Image. I then need to draw the image to a second (smaller) 
BufferedImage. The final step is to JPEG encode the image, which 
requires a second conversion from the BufferedImage to a Graphics2D. 
The end-result is that this process has a memory footprint (I'm 
estimating from watching it run) of over three times the uncompressed 
image size.

Is there any way to cut out one or all of these image format 
conversions? I had considered using a System.exec call to ImageMagick's 
identify and convert, which I assumed would be more resource efficient, 
and at very least, would take the memory hit out of the JVM, but it's 
not clear if I'm going to be able to get ImageMagick installed on the 
production box, so I've tabled that idea for now, and would prefer a 
more resource-efficient pure Java solution.

If anyone can help, it would be greatly appreciated.

Thanks,
Jeff

Re: Help Needed: Can't find Adaptor

Posted by sales <sa...@digiatlas.net>.

Thanks - that was exactly the problem. How one can fall for the simplest 
things sometimes...

cheers,
dd


Jonathan Millett wrote:
> Does your ObjectStructureName class implement Serializable?
> 
> Jon
> 
> sales wrote:
> 
>> Could not find an adaptor for class 
>> dae.web.wentities.ObjectStructureName.
> 
> 
> 
> 
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Re: Help Needed: Can't find Adaptor

Posted by Jonathan Millett <jo...@millett.net>.

Does your ObjectStructureName class implement Serializable?

Jon

sales wrote:

> Could not find an adaptor for class 
> dae.web.wentities.ObjectStructureName.



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Help Needed: Can't find Adaptor

Posted by sales <sa...@digiatlas.net>.


Hello,

I'm a bit stumped on this one:



Could not find an adaptor for class dae.web.wentities.ObjectStructureName.
Stack Trace:
org.apache.tapestry.util.AdaptorRegistry.searchForAdaptor(AdaptorRegistry.java:263) 

org.apache.tapestry.util.AdaptorRegistry.getAdaptor(AdaptorRegistry.java:152) 

org.apache.tapestry.util.io.DataSqueezer.squeeze(DataSqueezer.java:170)
org.apache.tapestry.util.io.DataSqueezer.squeeze(DataSqueezer.java:192)
org.apache.tapestry.engine.AbstractService.constructLink(AbstractService.java:72) 

...

----------------
The code causing the problem:

   <h2>Contents</h2>
   <table jwcid="table@contrib:Table" width="100%"
       source="ognl:objectResults"
       rowsClass="ognl:beans.evenOdd.next"
       columns="!shortDesc, !objectID"
       pageSize=200>

       <span jwcid="objectIDColumnHeader@Block">&nbsp;</span>
     <span jwcid="objectIDColumnValue@Block">
     <a href="#" jwcid="@DirectLink"
          parameters="ognl:components.table.tableRow"   <<<<<<<< problem
          listener="ognl:listeners.viewObject">Details</a>
     </span>
   </table>



Yet if I put:

parameters="ognl:components.table.tableRow.objectID"

(getObjectID() being one of the methods of ObjectStructureName) it works 
fine. However, I want to pass the whole object as I need several of its 
attributes.

What have I done wrong?

dd (stumped)


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Re: Thumbnailing...

Posted by phillip rhodes <rh...@yahoo.com>.

check out poor man's image library.
It's opensource simple library that allows one to do
many image related tasks.

apache license

http://www.mullassery.com/downloads/


--- Jean-Yves Sironneau <jy...@fr.st> wrote:

> I'am using this to create my thumbnails, don't know
> if that can help : 
> 
>     public void makeSmallContent(IContent content) {
>         if
> (IContent.MIME_JPEG.equals(content.getMimeType())) {
>             try {
>                 BufferedImage imageSource =
> ImageIO.read(new 
> ByteArrayInputStream(content
>                         .getPrimaryContent()));
>                 BufferedImage thumbnail =
> thumbnailnize(imageSource, 
> thumbnailSize);
>                 ByteArrayOutputStream out = new
> ByteArrayOutputStream();
>                 ImageIO.write(thumbnail,
> content.getMimeType(), out);
>                
> content.setSmallContent(out.toByteArray());
>             } catch (ImageFormatException e) {
>                 _log.error(e);
>             } catch (IOException e) {
>                 _log.error(e);
>             }
>         }
>     }
> 
> 
>    /**
>      * Scale a given image.
>      * 
>      * @param source
>      *            the source image
>      * @param scaleValue
>      *            the scale factor.
>      * @return the transformed image.
>      * 
>      */
>     public static BufferedImage scale(BufferedImage
> source, double scaleValue) 
> {
>         AffineTransform tx = new AffineTransform();
>         tx.scale(scaleValue, scaleValue);
>         AffineTransformOp op = new
> AffineTransformOp(tx, 
> AffineTransformOp.TYPE_BILINEAR);
>         BufferedImage biNew = new
> BufferedImage((int) (source.getWidth() * 
> scaleValue),
>                 (int) (source.getHeight() *
> scaleValue), source.getType());
>         return op.filter(source, biNew);
>     }
> 
>     /**
>      * Thumbnail creation
>      * 
>      * @param source
>      *            the source image
>      * @param thumbnailMaxSize
>      *            the maximum size of the thumbnail
> either horizontally or 
> vertically
>      * @return the thumbnailized image
>      * 
>      */
>     public static BufferedImage
> thumbnailnize(BufferedImage source, int 
> thumbnailMaxSize) {
>         double maxDimension =
> Math.max(source.getWidth(), source.getHeight());
>         double scaleValue = thumbnailMaxSize /
> maxDimension;
>         return scale(source, scaleValue);
>     }
> 
> 
> On Wednesday 09 February 2005 14:47, Jeff LaMarche
> wrote:
> > In a tapestry app I'm working on, I allow users to
> upload images. I
> > then create a thumbnail of the image using a
> utility class I've
> > written. I've searched online for other pure Java
> thumbnail solutions,
> > and they all seem to use the same approach that I
> use.
> >
> > The problem with these approaches is that the
> default Toolkit can
> > create an Image from a file, but not (seemingly) a
> BufferedImage.
> > Therefore, I need to create an Image then create a
> Buffered Image from
> > that Image. I then need to draw the image to a
> second (smaller)
> > BufferedImage. The final step is to JPEG encode
> the image, which
> > requires a second conversion from the
> BufferedImage to a Graphics2D.
> > The end-result is that this process has a memory
> footprint (I'm
> > estimating from watching it run) of over three
> times the uncompressed
> > image size.
> >
> > Is there any way to cut out one or all of these
> image format
> > conversions? I had considered using a System.exec
> call to ImageMagick's
> > identify and convert, which I assumed would be
> more resource efficient,
> > and at very least, would take the memory hit out
> of the JVM, but it's
> > not clear if I'm going to be able to get
> ImageMagick installed on the
> > production box, so I've tabled that idea for now,
> and would prefer a
> > more resource-efficient pure Java solution.
> >
> > If anyone can help, it would be greatly
> appreciated.
> >
> > Thanks,
> > Jeff
> 
>
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> 
> 


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Re: Thumbnailing...

Posted by Jean-Yves Sironneau <jy...@fr.st>.

I'am using this to create my thumbnails, don't know if that can help : 

    public void makeSmallContent(IContent content) {
        if (IContent.MIME_JPEG.equals(content.getMimeType())) {
            try {
                BufferedImage imageSource = ImageIO.read(new 
ByteArrayInputStream(content
                        .getPrimaryContent()));
                BufferedImage thumbnail = thumbnailnize(imageSource, 
thumbnailSize);
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                ImageIO.write(thumbnail, content.getMimeType(), out);
                content.setSmallContent(out.toByteArray());
            } catch (ImageFormatException e) {
                _log.error(e);
            } catch (IOException e) {
                _log.error(e);
            }
        }
    }


   /**
     * Scale a given image.
     * 
     * @param source
     *            the source image
     * @param scaleValue
     *            the scale factor.
     * @return the transformed image.
     * 
     */
    public static BufferedImage scale(BufferedImage source, double scaleValue) 
{
        AffineTransform tx = new AffineTransform();
        tx.scale(scaleValue, scaleValue);
        AffineTransformOp op = new AffineTransformOp(tx, 
AffineTransformOp.TYPE_BILINEAR);
        BufferedImage biNew = new BufferedImage((int) (source.getWidth() * 
scaleValue),
                (int) (source.getHeight() * scaleValue), source.getType());
        return op.filter(source, biNew);
    }

    /**
     * Thumbnail creation
     * 
     * @param source
     *            the source image
     * @param thumbnailMaxSize
     *            the maximum size of the thumbnail either horizontally or 
vertically
     * @return the thumbnailized image
     * 
     */
    public static BufferedImage thumbnailnize(BufferedImage source, int 
thumbnailMaxSize) {
        double maxDimension = Math.max(source.getWidth(), source.getHeight());
        double scaleValue = thumbnailMaxSize / maxDimension;
        return scale(source, scaleValue);
    }


On Wednesday 09 February 2005 14:47, Jeff LaMarche wrote:
> In a tapestry app I'm working on, I allow users to upload images. I
> then create a thumbnail of the image using a utility class I've
> written. I've searched online for other pure Java thumbnail solutions,
> and they all seem to use the same approach that I use.
>
> The problem with these approaches is that the default Toolkit can
> create an Image from a file, but not (seemingly) a BufferedImage.
> Therefore, I need to create an Image then create a Buffered Image from
> that Image. I then need to draw the image to a second (smaller)
> BufferedImage. The final step is to JPEG encode the image, which
> requires a second conversion from the BufferedImage to a Graphics2D.
> The end-result is that this process has a memory footprint (I'm
> estimating from watching it run) of over three times the uncompressed
> image size.
>
> Is there any way to cut out one or all of these image format
> conversions? I had considered using a System.exec call to ImageMagick's
> identify and convert, which I assumed would be more resource efficient,
> and at very least, would take the memory hit out of the JVM, but it's
> not clear if I'm going to be able to get ImageMagick installed on the
> production box, so I've tabled that idea for now, and would prefer a
> more resource-efficient pure Java solution.
>
> If anyone can help, it would be greatly appreciated.
>
> Thanks,
> Jeff

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Re: Thumbnailing...

Posted by Barry Books <bf...@mac.com>.

I've done this several ways and I don't think System is the right way to do this, but you don't want this in the main webserver either. The problem is if your JVM is very large fork/exec can be expensive (or not possible) and lots of requests equals lots of processes. Putting this function in the main webserver JVM will make your site crash from time to time. I finally settled on running a separate Tomcat with a servlet just for this purpose. That way you can write all the code in Java using the imaging library. The main application just passes the images along to the image server via http.

You can have multiple backend image servers if needed, you can restart them when they fail and you can control how much memory and cpu they are allowed to have or even have dedicated boxes. Instead of creating the thumbnails on upload I created them when requested and cached the result. Either way would work but I also had a process that deleted any thumbnails over 1 month old. That way I did not waste storage on images no one looked at.

I had over 500 gig of images and this way worked for me. None of the other ways did. 

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