tcpdf header and footer with logo

Hi,
sorry for my english. I had problem with TCPDF. The system doesn't show picture; for resolve this problem i tried for 2 days to change the folder, absolute path etc. but it didn't work. Then i was going to administrator/components/com_chronoforms5/chronoforms/actions/tcpdf/tcpdf/config/tcpdf_config.php and change this rows:

<?php
define ('K_PATH_IMAGES', K_PATH_MAIN.'images/');

	/**
	 * blank image
	 */
	define ('K_BLANK_IMAGE', K_PATH_IMAGES.'_blank.png');

	/**
	 * page format
	 */
	define ('PDF_PAGE_FORMAT', 'A4');

	/**
	 * page orientation (P=portrait, L=landscape)
	 */
	define ('PDF_PAGE_ORIENTATION', 'P');

	/**
	 * document creator
	 */
	define ('PDF_CREATOR', 'TCPDF');

	/**
	 * document author
	 */
$db =& JFactory::getDBO();
$query = "SELECT `logo`, `ragione_sociale`, `via`,`numero`, `cap`, `citta`, `provincia`, `p_iva`, `prefisso_tel`, `tel`, `prefisso_fax`, `fax`, `sito`, `email`, `modalita`, `banca`, `iban`, `iva`, `inarcassa`
 FROM `sinc_chronoengine_chronoforms_datatable_dati_azienda`";
$db->setQuery($query);
$a = $db->loadRow();
$intestazione1 = $a[2].",".$a[3]." - ".$a[4]." ".$a[5]." (".$a[6].") P.IVA: ".$a[7];
$intestazione2= "tel: ".$a[8].".".$a[9]." - fax:".$a[10].".".$a[11];
$intestazione3="sito: ".$a[12]." - email: ".$a[13];
	define ('PDF_AUTHOR', 'TCPDF');

	/**
	 * header title
	 */
	define ('PDF_HEADER_TITLE', $intestazione1);

	/**
	 * header description string
	 */
	define ('PDF_HEADER_STRING', $intestazione2."\n".$intestazione3);

	/**
	 * image logo
	 */
$db =& JFactory::getDBO();
$query = "SELECT `logo`
 FROM `sinc_chronoengine_chronoforms_datatable_dati_azienda`";
$db->setQuery($query);
$a = $db->loadRow();
	define ('PDF_HEADER_LOGO', $a[0]);

	/**
	 * header logo image width [mm]
	 */
	define ('PDF_HEADER_LOGO_WIDTH', 60);

	/**
	 *  document unit of measure [pt=point, mm=millimeter, cm=centimeter, in=inch]
	 */
	define ('PDF_UNIT', 'mm');

	/**
	 * header margin
	 */
	define ('PDF_MARGIN_HEADER', 5);

	/**
?>

now it works fine and i put logo in the header, but i think that when, in the future, i will make an update, this code will be complitelly delete. My Question is is true or false?

thank you very much bob.