Method of producing halftone images

Details Method of producing halftone images Method of producing halftone images

G - Physics

09

G

375/4, 178/3.1

G09G 5/00 (2006.01) H04N 1/405 (2006.01)

Patent

CA 2025000

Abstract: An improved method is described for producing halftone images with halftone cell dimensions and orientation to match a desired screen grid by choosing reference halftone gray values for each pixel in a supertile of representative halftone cells, testing source pixel gray values against corresponding reference gray values and selectively displaying corresponding pixels, where the supertile includes more than one halftone cell, is composed of whole pixels, can tile the source image plane when placed side-by-side with copies of itself, and includes halftone cells on adjacent supertiles that, in tiling the plane, align exactly or closely to approximate a smooth halftone screen. The invention also includes ways of manipulating the supertile for faster output of a halftone image.

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