wp_save_image example

if ( empty( $attachment_id ) || ! current_user_can( 'edit_post', $attachment_id ) ) {
        wp_die( -1 );
    }

    check_ajax_referer( "image_editor-$attachment_id" );
    require_once ABSPATH . 'wp-admin/includes/image-edit.php';

    $msg = false;

    switch ( $_POST['do'] ) {
        case 'save':
            $msg = wp_save_image( $attachment_id );
            if ( ! empty( $msg->error ) ) {
                wp_send_json_error( $msg );
            }

            wp_send_json_success( $msg );
            break;
        case 'scale':
            $msg = wp_save_image( $attachment_id );
            break;
        case 'restore':
            $msg = wp_restore_image( $attachment_id );