Halftone Images

Look closely at any newspaper image or magazine picture. With good eyesight and good lighting, or perhaps some help from a magnifying glass, what you see will almost certainly be a pattern of tiny dots. This is because continuous-tone images, such as artwork or photographs, cannot be reproduced by commercial printers. Instead such images are printed through a process called halftoning which simulates the look of continuous tones. Halftoning uses variably sized dots to simulate different shades of an ink color. In this process, larger dots create darker shades, while smaller dots create lighter ones. For example, a 30 percent gray is created not with grey ink, but with black ink which covers only 30 percent of the surface area assigned to that color.