Editing Images using Photoshop
Photographs are continuous-tone images because you cannot distinguish divisions, or gradations, between colors. Printed images are not continuous-tone images. Instead, printers create the illusion of many colors using halftone dots. Most printed images are made up of rows of dots of varying sizes, called halftone screens, which produce the appearance of multiple tones when printed.
The quality of a printed image is greatly influenced by the refinement of its halftone screen. The finer the screen, the less apparent the dot pattern, because there are more dots per area and they are closer together. A high-resolution imagesetter, which can produce a high number of dots per inch, will accommodate a fine halftone screen.
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