genesis-signature-image.php

<?php
/**
* Displays a signature image after the post content in 
* any Genesis Child theme.
*
* @author     FAT Media <http://youneedfat.com>
* @copyright  Copyright (c) 2013, FAT Media, LLC
* @license    GPL-2.0+
*/

add_action( 'genesis_before_loop', 'prefix_include_signature' );
function prefix_include_signature() {
  	//* Use the correct hook no matter what theme is enabled.
	if ( ! genesis_html5() ) {
		add_action( 'genesis_after_post_content', 'prefix_display_signature', 10 );
	} else {
		add_action( 'genesis_entry_footer', 'prefix_display_signature', 10 );
	}
	// Display the signature image
	function prefix_display_signature() {
		// Display only on single posts, archives, and the home page.
		if ( is_single() || is_archive()|| is_front_page() ) {
			echo'<img src="http://yourdomain.com/your-image.png" alt="Signature" title="Signature" />';
		}
	}
}