Support Forum

There’s a filter you can use: wpsp_image_href

add_filter( 'wpsp_image_href','tu_change_wpsp_image_href' );
function tu_change_wpsp_image_href( $url ) {
    $custom_url = get_post_meta( get_the_ID(), 'my_custom_field_url', true );
    if ( is_page( 'your-page-slug' ) && '' !== $custom_url ) {
        return $custom_url;
    }

    return $url;
}

That assumes you have a custom field called “my_custom_field_url” in your post.

Let me know if you need more info 🙂