wordpress - How to make custom template include content from page editor without post loop? -

i want create custom page template have header , full-screen image. following codex article created custom page following

<?php /**  * template name: custom template  */  get_header(); ?>  <?php // start loop. while ( have_posts() ) : the_post();    // include page content template.   get_template_part( 'content', 'page' );  // end loop. endwhile; ?> 

but when create new page using template , add <img src="link/to/image.jpg" alt="my image"> using page editor image nested in many div's , article tag (see below). want image tag followed header can make fullscreen not boxed. there way directly add (without post loop) content typed in page editor page using custom templates?

i thought post loop adding stuff tried using get_template_part( 'content', 'page' ); without loop doesn't works.

this line get_template_part( 'content', 'page' ); fetch content content-page.php. if dont want , display content replace line following line.

the_content();