Halftone is a technique for printing photographs with ink. Ink cannot print true shades of gray, so the continuous tones of a photograph are turned into a pattern of tiny dots. Dark areas have large dots close together, and light areas have small dots with more space between them.
From normal viewing distance the eye blends the dots into smooth tones. You usually need a magnifying glass to see them. Halftone made it possible to print photographs in newspapers, magazines and books from the late 19th century. It is still used today. Modern printing presses and printers create the dots digitally, and color printing uses separate dot patterns for each CMYK ink.
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