You can find more information on my homepage https://lachner-net.de/index.php/en/sof ... allery-mod or on github https://github.com/blachner/gallery.
The screenshot is taken with minetest 0.4. Unfortunately with minetest 5 the pictures are limited to the size of one block at the moment. I posted a topic in the mod discussion forum, but this topic was lost after the forum crash.