Bonjour

Dans piwigo, tu peux régler pour qu'il utilise la table utilisateur de joomla

/ If you decide to use external authentication
// change conf below by $conf['external_authentification'] = true;
$conf['external_authentification'] = false;

// Other tables can be changed, if you define associated constants
// Example:
//   define('USER_INFOS_TABLE', 'pwg_main'.'user_infos');

// user_fields : mapping between generic field names and table specific
// field names. For example, in PWG, the mail address is names
// "mail_address" and in punbb, it's called "email".
$conf['user_fields'] = array(
  'id' => 'id',
  'username' => 'username',
  'password' => 'password',
  'email' => 'mail_address'
  );

// password_hash: function hash the clear user password to store it in the
// database. The function takes only one parameter: the clear password.
$conf['password_hash'] = 'pwg_password_hash';

// password_verify: function that checks the password against its hash. The
// function takes 2 mandatory parameter : clear password, hashed password +
// an optional parameter user_id. The user_id is used to update the password
// with the new hash introduced in Piwigo 2.5. See function
// pwg_password_verify in include/functions_user.inc.php
$conf['password_verify'] = 'pwg_password_verify';

Bonjour

joomla et piwigo utilise la même base de données ?