php - prestashop display attachment inline -

i'm creating custom pdf file containing product details. display product attachments images. have changed attachment controller

header('content-disposition: inline; filename="'.utf8_decode($a->file_name).'"'); 

when visit url through browser displays nicely:

http://domain.nl/nl/index.php?controller=attachment&id_attachment=483 

but using url inside img tag in pdf template gives:

tcpdf error: [image] unable image: http://domain.nl/nl/index.php?controller=attachment&id_attachment=483 

does have idea on how make work?

i created new file next attachmentcontroller.php called attachmentinlinecontroller.php. contents different:

<?php class attachmentinlinecontrollercore extends frontcontroller {     public function __construct()     {         $a = new attachment(tools::getvalue('id_attachment'), $this->context->language->id);         if (!$a->id) {             tools::redirect('index.php');         }           if (ob_get_level() && ob_get_length() > 0) {             ob_end_clean();         }          header('content-transfer-encoding: binary');         header('content-type: '.$a->mime);         header('content-length: '.filesize(_ps_download_dir_.$a->file));         header('content-disposition: inline; filename="'.utf8_decode($a->file_name).'"');         @set_time_limit(0);         readfile(_ps_download_dir_.$a->file);         exit;      } }?> 

i removed hook, changed content-disposition inline, , changed function postprocess() __construct. if use:

http://domain.nl/nl/index.php?controller=attachmentinline&id_attachment=483

it display attachment inline, , can use url in image tags etc.