Creating image nodes programatically.

I am uploading files using my own script and want to pass of the file path to the function image_create_node_from(). I do this and get an image node created but none of the image derivatives get created. I got creative and exposed _image_build_derivatives() by copying it and simply renaming it exposed_image_build_derivatives(). This worked but it left the derivatives in files/images/temp. Alternatively I tried calling image_operations_rebuild() but that left the permissions on the images 655 (rw-r--r--), which is not useful for the web.

Here is my code:

function attach_images_form_submit($form_id, $form_values)
{
  /* check in the args for the item id
  $count = 0;
  while($arg = arg($count))
  {
    print "Arg: $arg";
    $count++;
  }
  */
  
  $item_id = arg(2);
  
  //print "<pre>" . print_r($form_values, TRUE) . "</pre>";
  
  $dir = variable_get('file_directory_path', NULL);
  // we want to put them in files/images/import
  $dir = $dir . "/images/import";
  
  //print "Directory: $dir<br/>";
  
  $is_writable = file_check_directory($dir, 1);
  
  //print "Is Writable: $is_writable<br/>";
  
  if($is_writable)
  {
    // loop through each of the upload items
    foreach($form_values as $key=>$data)
    {
      //print "Key: $key<br/>";

      if(strpos($key, 'upload') !== FALSE) // MAKE SURE WE ARE IN A KEY FOR AN UPLOAD
      {
        $source = file_check_upload($key);
        
        // Security measure to prevent exploit of file.php.png
        $source->filename = $item_id.".".upload_munge_filename($source->filename);
        //print "<pre>" . print_r($source, TRUE) . "</pre>";
            
        if ($file = file_save_upload($source,$dir ))
        {
          if(image_get_info($file->filepath))
          {
            //print "<pre>" . print_r($file, TRUE) . "</pre>";
            $node = image_create_node_from($file->filepath);
            // build our preview images/etc
            exposed_image_build_derivatives($node, TRUE);
            //image_operations_rebuild($node);
            //drupal_set_message(t('New image saved.'));
            // now we can create an image node from the filename
          }
          else
          {
            file_delete($file->filepath);
            drupal_set_message('Uploaded file does not appear to be a valid image file. Please try again.');
          }
        } 
      }
    }
  }
}

Basically is there a function that I can call after I build the node to generate the derivatives?

Thanks!