08/102,329 to Harrington now patented, U.S. These goals are in large part accomplished in the inventor's own U.S. In the binary case, the pixels or cell elements for which the thresholds are exceeded might be printed as black or some color, while the remaining elements are allowed to remain white or uncolored, dependent on the actual physical quantity described by the data. the image value at that specific location is larger than the value stored in the dither matrix for that same location, while others are not.
The effect of such an arrangement is that, for an area where the image is a contone, some of the thresholds within the dither matrix will be exceeded, i.e. In such arrangements, over a given area in the separation having a number of contone pixels therein, each pixel value of an array of contone pixels within the area is compared to one of a set of preselected thresholds (the thresholds may be stored as a dither matrix and the repetitive pattern generated by this matrix is considered a halftone cell) as taught, for example, in U.S. Thus, given a color separation with 256 shades of each additive primary color, a set of binary printer signals must be produced representing the contone effect. Printers commonly provide a limited number of output possibilities, and are commonly binary, i.e., they produce either a spot or no spot at a given location (although multilevel printers beyond binary are known).
Harrington Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US08/559,323 Inventor Steven J.
Google Patents Color images having multiple separations with minimally overlapping halftone dots and reduced interpixel contrastÄownload PDF Info Publication number US5631748A US5631748A US08/559,323 US55932395A US5631748A US 5631748 A US5631748 A US 5631748A US 55932395 A US55932395 A US 55932395A US 5631748 A US5631748 A US 5631748A Authority US United States Prior art keywords black separation spots color signals Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5631748A - Color images having multiple separations with minimally overlapping halftone dots and reduced interpixel contrast US5631748A - Color images having multiple separations with minimally overlapping halftone dots and reduced interpixel contrast