Laser photoplotting supports positive or negative images, crucial for inner copper versus solder mask layers

https://www.newsbreak.com/dmr-news-321522575/4524631068041-artnet-pro-sets-the-standard-in-high-resolution-pcb-photoplotting-for-aerospace-and-advanced-electronics

Laser photoplotting supports positive or negative images, crucial for inner copper versus solder mask layers, giving fabs flexibility to match their resist processes and optimize contrast for clean edges.