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A means of manually altering the size of a halftone dot after the halftone film has already been produced. Dot etching can be performed chemically by immersing the film in an acid bath, photographically by overexposing the halftone film on other films, or digitally by altering the dot size on a computer. Dot etching is performed as a means of altering the colors in a particular image area when halftones and color separations are produced photographically. Such processes, however, are increasingly being performed digitally. (See also Dry Dot Etching.)