Before exposure, fabs verify plot integrity with AOI systems that compare the film to source data

https://andersontgrd978.tearosediner.net/laser-photoplotting-services-the-path-to-zero-defect-photo-tools

Before exposure, fabs verify plot integrity with AOI systems that compare the film to source data, catching broken traces, missing apertures, or polarity errors before costly imaging and etching steps.