hey guys, i haven't done this with my live board and site yet, only testing...
If u look carefully in the user tables of 4images and phpbb, i will see that most of the field are the same so its fairy easy to to the import.
The next things to worry about is u want to make sure users have to login via the phpbb board before they can view 4images pages...just add this codes to any of ur php files
<?php
define('IN_PHPBB', 1);
$no_page_header = TRUE;
$phpbb_root_path = "./your forum dir";
require($phpbb_root_path . 'extension.inc');
include($phpbb_root_path . 'common.'.$phpEx);
$userdata = session_pagestart($user_ip, PAGE_INDEX);
init_userprefs($userdata);
if( !$userdata['session_logged_in'] ) {
header("Location: http://www.yoursite.com/phpbb/login.php?redirect=fileToRedirec.php");
}
?>
Also look at the phpbb forum, u will find codes that allow u to specify only certain user in a certain group to view the files, just create a group call every1 and allow access for all user, u shoudl be fine