{% set meta = get_image_metadata(path=image) %}
<a href="{{ get_url(path=image) }}"
    class="lightbox"
    data-pswp-width="{{ meta.width }}"
    data-pswp-height="{{ meta.height }}"
    target="_blank">
    <img src="{{ get_url(path=image) }}" alt="{{alt}}" title="{{alt}}" />
</a>