I rewrote my entire "post jpg to web"-code, and got a significant increase in speed.

Usage:
Code:

void saveJPG()
{
  println("SAVING JPG START");  
  postData(bufferImage(get(0,0,width,height)).toByteArray());
  println("SAVING JPG STOP");  
}
 

Code:
Code:

import com.sun.image.codec.jpeg.*;

void postData(byte[] bytes)
{
  try{
    String url = "http://YourWebURL/";
    URL u = new URL(url+"saveJpg.php");
    URLConnection c = u.openConnection();
    
    // post multipart data
    c.setDoOutput(true);
    c.setDoInput(true);
    c.setUseCaches(false);
    
    // set request headers
    c.setRequestProperty("Content-Type", "multipart/form-data; boundary=AXi93A");
    
    // open a stream which can write to the url
    DataOutputStream dstream = new DataOutputStream(c.getOutputStream());
    
    // write content to the server, begin with the tag that says a content element is comming
    dstream.writeBytes("--AXi93A\r\n");
    
    // discribe the content, (in this case it's an image file)
    dstream.writeBytes("Content-Disposition: form-data; name=\"img\"; filename=\"whatever\" \r\nContent-Type: image/jpeg\r\nContent-Transfer-Encoding: binary\r\n\r\n");
    dstream.write(bytes,0,bytes.length);
    
    // close the multipart form request
    dstream.writeBytes("\r\n--AXi93A--\r\n\r\n");
    dstream.flush();
    dstream.close();
    
    // read the output from the URL
    try{
	DataInputStream in =
	  new DataInputStream(
	new BufferedInputStream(c.getInputStream()));
	String sIn = in.readLine();
	boolean b = true;
	
	while(sIn!=null){
	  if(sIn!=null){
	    if(sIn.substring(0,5).equals("saved")) link(url+sIn, "_new"); 
	    System.out.println(sIn);
	  }
	  sIn = in.readLine();
	}
    }
    catch(Exception e){
	e.printStackTrace();
    }
  }
  catch(Exception e){
    e.printStackTrace();
  }
}

ByteArrayOutputStream bufferImage(PImage srcimg){
  ByteArrayOutputStream out = new ByteArrayOutputStream();
  BufferedImage img = new BufferedImage(srcimg.width, srcimg.height, 2);
  img = (BufferedImage)createImage(srcimg.width, srcimg.height);
  for(int i = 0; i < srcimg.width; i++)
  {
    for(int j = 0; j < srcimg.height; j++)
    {
	int id = j*srcimg.width+i;
	img.setRGB(i,j, srcimg.pixels[id]); 
    }
  }
  try{
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
    JPEGEncodeParam encpar = encoder.getDefaultJPEGEncodeParam(img);
    encpar.setQuality(1,false); // 0.0-1.0, force baseline
  encoder.setJPEGEncodeParam(encpar);
    encoder.encode(img);
  }
  catch(FileNotFoundException e){
    System.out.println(e);
  }
  catch(IOException ioe){
    System.out.println(ioe);
  }
  return out;
}
 

PHP: (assumed saveJpg.php)
Code:

<?
$Title = "ImageTitle";

$savepath = dirname($_SERVER["PATH_TRANSLATED"]);

$filename = $Title."_".date("Ymd-His").".jpg";
while(file_exists("saved/".$filename))
  $filename = $Title."_".date("Ymd-His")."-".rand(2,500).".jpg";

 if (is_uploaded_file($img))
 {
   $newfile = $savepath."/saved/".$filename;
   if (!copy($img, $newfile))
   {
	// if an error occurs the file could not
	// be written, read or possibly does not exist
	echo "Error Uploading File.#1";
	exit();
   }else{
	echo "saved/".$filename;
   }
 }else{
	echo "Error Uploading File.#2";
	exit();
 }
?>
 

This code assumes you have a folder named "saved" in the same folder you have saveJpg.php in.
The folder "saved" should also be set to writable (chmod 777).

hope you guys will enjoy!

-seltar

the folder "saved" that i set in the variable $newfile, is a folder, which has to have chmod 777 as well.
You can just remove that, but whatever folder you are trying to write to, has to have chmod 777

I'm hoping that this will solve your problems, cause if not i'm not quite sure.. unless you show me the code you're using.

I'm on the same system as you, so that shouldn't matter..

best
seltar

Dear Seltar,

As I said earlier, saving JPG to server works quite well. The application I developed is a collaborative drawing website (http://www.drawover.com), where users can draw via a Processing interface, save their image that will be modified later by someone else.

Nevertheless a mistery remains: some of the images appear properly in the browser but some others do not (see menu VIEW for example). After discussion with users, it appeared that the "bad" pictures had been generated from a Mac and are reproducibly "bad". After some analysis, I found that these JPG images contain 4 channels (CMYB) whereas all others only contain 3 channels (RGB).

It is interesting to notice that Processing's "loadimage" can cope with both these formats without any problem. But PHP and HTML cannot...

So my question is: do you know a way to force the JPG generator to work with only 3 channels ? or is it related to an extra parameter in the environment of the user's computer ?

Thanks in advance,
Best regards,
JMC

PS: it is probably easier to convert CMYB to RGB in the PHP, I did not try yet.

I made an example that does something similar, haven't tested it fully, but does the CMYB vs. RGB happen with this code too? (i'm only working on a mac right now so can't tell)

http://www.shiffman.net/2006/05/02/upload/

Dan

Hi,

It seems like Dan-Kyle's solution does work through a browser both with PC and Mac. I added a few lines from Seltar's example to control the JPEG quality. It's here:

http://joan.cat/codi/jpgup.zip

-joan

oups! Thank you! It's fixed now:
http://joan.cat/codi/jpgup.zip

j

the color bug seem to be a osx tiger problem. with leopard it works perfect..