Meaning of Ben Day process

Ben' Day' proc"ess

Pronunciation: (ben' dā'), [key]
— Photoengraving. Photoengraving.
  1. a technique for producing shading, texture, or tone in line drawings and photographs by overlaying a fine screen or a pattern of dots on the original artwork, on a negative of it, or on the plate before etching.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.