Can't get attachment page link

Okay I am 100% sure this has something to do with the way Eazyest Gallery manages the clicks. If I change the option in Easyest Admin to link to attachment page when the thumbnail is clicked, then the above functions work as expected, linking to the attachment page https://127.0.0.1/luckybeanz/gallery/windsurfing-2/baja-mexico-8831/#main

That doesn’t really help as my aim is to have the thumbnail link to a large image, 1024×637 in this case, in a lightbox and then have a link on the lightbox to the attachment page showing the full rez image, 4023×2053 in this case.

So how exactly is Eazyest storing this information and how can I get the attachment page when the setting is set to show a large image not link to the attachment page.

This was due to a filter. What I ended up doing is writing a plugin that took the image URL and searched the DB for the attachment page then redirected it to the attachment page. The code is below

if (!function_exists('link_to_attachment')) {
	function link_to_attachment() {
     global $wpdb;	 

	 //check to see if already run, and if so exit
	 static $count=0;
	  if ($count++)
       exit;

		if (isset($_GET["url"])) {
		   $ImageURL = $_GET["url"];
		   $attachment_page_id  = $wpdb->get_var( $wpdb->prepare( "SELECT wposts.ID FROM $wpdb->posts wposts WHERE wposts.post_type = 'attachment' AND wposts.post_mime_type = 'image/jpeg' AND INSTR('%s',wposts.post_name)>0", $ImageURL) );
		        if ($attachment_page_id == Null){
				  wp_redirect( $ImageURL, 302); //if can't find attachment page id redirect to the current image file
				 // echo "No Attachment Page $attachment_page";
				  exit;
				}else{
wp_redirect( $attachment_page, 301);		  

				  exit;
				}
		   }

	  }

	add_action('init', 'link_to_attachment',0);
}