Photogravure on copperplate or heliogravure is one of most beautiful ways to show a photographic image as a final art. Digital image processing helps in several steps of the photogravure process: Editing the digital file before being printed on a translucent media, creating the necessary randomly distributed screen and adjusting the image tonal range in order to match the sensitized paper dynamic range. If you want to know the details of this process, look at https://carlesmitja.net/2016/12/07/a-hybrid-approach-to-photogravure-on-copperplate/