Multiple Featured Images for multiple Post types

// In your functions.php
if( class_exists( 'kdMultipleFeaturedImages' ) ) {
        $labels = array(
                    'name'          => 'Titelbild',
                    'set'           => 'Titelbild festlegen',
                    'remove'        => 'Titelbild entfernen',
                    'use'           => 'Als Titelbild verwenden',
                );
        new kdMultipleFeaturedImages( array(
                'id'            => 'header-image',
                'post_type'         => 'page',      // Set this to post or page
                'labels'        => $labels
        ) );
        new kdMultipleFeaturedImages( array(
                'id'            => 'header-image',
                'post_type'         => 'post',      // Set this to post or page
                'labels'        => $labels
        ) );
}

//In your header.php (or single.php, page.php, whatever)
    global $post;
    if( kd_mfi_get_featured_image_url( 'header-image', $post->post_type, 'full' ) ) {
        kd_mfi_the_featured_image( 'header-image', $post->post_type, 'full' );
    }