The engraving process encompasses an electronically-controlled diamond-stylus that cuts or engraves cells into the surface of cylinder. A combination of these cells forms the image. After artwork has been supplied by the customer, the DTP/Origination department transforms the artwork into a format understood by the specialised software used to communicate to the high tech engravers.
Each image is converted to halftone-like dots, each having an electronic signal, ranging in intensity from 0:100%, depending on the light density of the image. The image is then converted back into an analogue signal, which then drives the engraving head, regulating the depth to carve the cell on the cylinder. A computerised system controls the engraving head, which moves diagonally across cylinder punching cell holes at between 6000 and 8000 holes per minute. At 100% depth, the diamond-shaped cells interlock with those of the rows on either side of it, creating just a tiny cell wall; therefore at 10% the cell walls are thicker or bigger. The angle of cells can be altered by producing elongated or compressed diamond shaped cells if necessary.