Halftone is the reprographic technique that simulates continuous tone imagery through the use of dots, varying either in size, in shape or in spacing. "Halftone" can also be used to refer specifically to the image that is produced by this process.
Where continuous tone imagery contains an infinite range of colors or greys, the halftone process reduces visual reproductions to a binary image that is printed with only one color of ink. This binary reproduction relies on a basic optical illusion—that these tiny halftone dots are blended into smooth tones by the human eye.
At a microscopic level, developed black and white photographic film also consists of only two colors, and not an infinite range of continuous tones.
refer: http://en.wikipedia.org/wiki/Halftone
Where continuous tone imagery contains an infinite range of colors or greys, the halftone process reduces visual reproductions to a binary image that is printed with only one color of ink. This binary reproduction relies on a basic optical illusion—that these tiny halftone dots are blended into smooth tones by the human eye.
At a microscopic level, developed black and white photographic film also consists of only two colors, and not an infinite range of continuous tones.
Left : Halftone dots.
Right : How the human eye would see this sort of arrangement from a sufficient distance.
refer: http://en.wikipedia.org/wiki/Halftone
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