Halftone process, in printing, a technique of breaking up an image into a series of dots so as to reproduce the full tone range of a photograph or tone art work. Breaking up is usually done by a screen inserted over the plate being exposed. ... The highest quality reproduction requires 120 to 150 lines per inch.

What is known as halftoning?

1 : half step sense 2. 2a : any of the shades of gray between the darkest and the lightest parts of a photographic image. b(1) : a photoengraving made from an image photographed through a screen and then etched so that the details of the image are reproduced in dots.

When were halftones invented?

No single individual can be named as the inventor of the halftone photomechanical process. William Henry Fox Talbot (British, 1800–1877) invented and patented his use of textile screens in 1852.