NEW Page for every image killing my SEO

Well this is a wordpress feature –
if you go to your media library and open one image to edit – there is an attachment page.
If you are using Yoast SEO there is an Option to do this : redirect image attachment page to something.

if you not using it – and you don’t like to use a plugin – you can redirect all image attachment pages f.e. to your homepage via child-theme functions.php:

function image_redirect_attachment_page() {
	if ( is_attachment() ) {
		global $post;
		if ( $post && $post->post_parent ) {
			wp_redirect( esc_url( get_permalink( $post->post_parent ) ), 301 );
			exit;
		} else {
			wp_redirect( esc_url( home_url( '/' ) ), 301 );
			exit;
		}
	}
}
add_action( 'template_redirect', 'image_redirect_attachment_page' );