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HALFTONE RANGE EXTENSION THROUGH INTENSITY CONTROL

IP.com Disclosure Number: IPCOM000026540D
Original Publication Date: 1992-Aug-31
Included in the Prior Art Database: 2004-Apr-06

Publishing Venue

Xerox Disclosure Journal

Abstract

The art of digital halftoning consists of representing an input as an array of cells wherein each cell contains a fixed number of pixels. Variation in tone for each cell is achieved by controlling the number of pixels that are black or white within the cell. For example, at 600 spots or pixels to the inch, a screen can be constructed with 36 levels at 100 cells to the inch. If the number of halftone levels is to be increased. the corresponding cell frequencies must be reduced. Likewise, if the number of cell frequencies is to be increased the number of tonal levels must be sacrificed.