How does a drum scanner work?

How does a drum scanner work?

Drum scanners are used by the publishing industry to appropriation incredibly detailed images. They use a technology call a photomultiplier tube (PMT). In PMT, the document to be scanned is mounted on a chalice cylinder. At the center of the cylinder is a sensor that splits light bounced from the document into three beam. Each beam is sent through a color filter into a photomultiplier tube where on earth the light is changed into an electrical signal.