Data preparation includes DFM checks, aperture mapping, mirroring

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

Data preparation includes DFM checks, aperture mapping, mirroring, and film scaling to compensate for lamination shrinkage, so the photoplot aligns with the final board dimensions after pressing.