When you've extracted is what you assign them to the template

example plugin

add_event_handler('loc_begin_page_header', 'TitleIPTC');

function TitleIPTC()
{
        global $template, $page;

              if ( !empty($page['image_id']) )   
                {

What did you do to recover the IPTC

$IPTC='What you want to send';

        if (!empty($IPTC))
            {
                $template->assign('INFO_HEADLINE', $IPTC);
            }
                }
}

I think the question is did you configure Piwigo to use your IPTC Headline? Is it mapped to an image property?

1) install + activate the LocalFiles Editor plugin.

2) open [Administration > Plugins > LocalFiles Editor > Local config] and paste:

<?php
$conf['use_iptc'] = true;

$conf['use_iptc_mapping'] = array(
  'name'            => '2#105',
  'comment'         => '2#120'
  );
?>

And then perform a metadata synchronization on your photo (from the photo administration page for example)

Please tell us if you reach the desired result.

brough wrote:

I could not figure out how to do the metadata synchronization - I can find nothing in the forums which is relevant, and naught in the help files either. I created a new album using ploader.

It would be great if someone were to address that issue at some time, if an issue (bug) it is.

Unfortunately, there is currently no tool to synchronize metadata on several photos at once if they have been added with pLoader or the web form, this is why we created [Bugtracker] ticket 1866

I've just written a small personnal plugin as an immediate workaround.

1) activate the LocalFiles Editor plugin

2) go to [Administration > Plugins > LocalFiles Editor > Personal Plugin] and paste the following code:

<?php
/*
Plugin Name: Personal Plugin
Version: 1.0
Description: Personal Plugin
Plugin URI: http://piwigo.org
Author:
Author URI:
*/

add_event_handler('loc_begin_admin', 'batch_metadata_sync');
function batch_metadata_sync()
{
  if (!isset($_GET['page']) or 'element_set' != $_GET['page'])
  {
    return null;
  }

  if (isset($_GET['mode']) and 'unit' == $_GET['mode'])
  {
    return null;
  }
  
  $trigger_caddie_actions = array('empty_selected', 'add_selected');
  if (!isset($_POST['caddie_action']) or !in_array($_POST['caddie_action'], $trigger_caddie_actions))
  {
    return null;
  }
  
  if (!isset($_POST['selection']) or count($_POST['selection']) == 0)
  {
    return null;
  }

  $query = '
SELECT id, path
  FROM '.IMAGES_TABLE.'
  WHERE id IN ('.implode(',', $_POST['selection']).')
;';
  $id_to_path = array();
  $result = pwg_query($query);
  while ($row = pwg_db_fetch_assoc($result))
  {
    $id_to_path[$row['id']] = $row['path'];
  }
  
  update_metadata($id_to_path);
}
?>

3) go to [Administration > Plugins > Manage], install and activate the "Personal Plugin"

4) go to [Administration > Categories > Manage] and click on the "Manage category elements" icon on the line of your category. You are on the photo batch manager, filtered on a given category. Select some photos and click on the "Add selected elements to caddie" option + "Submit". All the selected photos have been synchronized for metadata.

It also works when you remove photos from caddie in the photo batch manager.

Unfortunately, you have to select photos, you can't apply on all at once :-/ I need to think deeper to make this possible.