How To Display A Custom Image Field Uploaded Via WordPress Media

If you have created a custom field to upload images using WordPress media browser, this custom field is added to a post as an attachment.  Calling this custom field using the standard get_post_meta returns the attachment’s ID.  This is inserted into mySQL post table with its guid of the image file.

To display the actual image, you would using the following:

//  Change "my_custom_photo" to the slug of your custom field
$photo = get_post_meta( get_the_ID(), 'my_custom_photo', true );

//  Change "medium" to the thumbnail size used in your theme
$photo = wp_get_attachment_image( $photo, 'medium' );

echo $photo;