post.php

<?php

add_action( 'genesis_entry_content', 'genesis_do_post_image', 8 );
add_action( 'genesis_post_content', 'genesis_do_post_image' );
/**
 * Echo the post image on archive pages.
 *
 * If this an archive page and the option is set to show thumbnail, then it gets the image size as per the theme
 * setting, wraps it in the post permalink and echoes it.
 *
 * @since 1.1.0
 */
function genesis_do_post_image() {

	if ( ! is_singular() && genesis_get_option( 'content_archive_thumbnail' ) ) {

		$img = genesis_get_image( array(
			'format'  => 'html',
			'size'    => genesis_get_option( 'image_size' ),
			'context' => 'archive',
			'attr'    => genesis_parse_attr( 'entry-image', array(
				'alt' => get_the_title(),
			) ),
		) );

		if ( ! empty( $img ) ) {

			genesis_markup( array(
 				'open'    => '<a %s>',
 				'close'   => '</a>',
 				'content' => wp_make_content_images_responsive( $img ),
 				'context' => 'entry-image-link',
 			) );

 		}

	}

}