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<?php

//swap featured image above header only on home and archive pages
function themeprefix_image_before() {

if(is_home() || is_archive()) {

remove_action( 'genesis_entry_content', 'genesis_do_post_image', 8 );
add_action( 'genesis_entry_header', 'genesis_do_post_image', 8 );

		}
}

add_action('genesis_after_header','themeprefix_image_before');