For small volume work, digital printing can be used, but for high volume or even large enlargements, digital (laser) printing onto RA4 paper is used. This takes the original image, scans it and turns it into a digital file. The analog > digital is still better than all digital. This file is used to run 3 lasers at a high speed over the paper, exposing it. After this the RA4 paper is processed in the RA4 chemistry, which is also high speed.
The paper is made in widths up to 72" and prints that big can be made.
Duratrans is also handled this way to make huge displays for use in stores.
The paper is made at the Kodak Harrow plant and at Colorado.