In prepress, a lithograophic printing plate imaged from two separate halftone negatives, one providing the shadow and highlight regions (or, in other words, the two extremes of the tonal range of the image) the other providing the middle tone regions. A double halftone—not to be confused with a duotone or double-black halftone printing—reproduces with much greater tonal range than a conventional halftone. Also called a double-dot halftone.
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