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AssigneeHewlett-Packard Company
InventorsC. S. Chan, James G. Bearss, Terry M. Nelson
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A method of gray scale printing of dots of one or more colors into pixels and in a controlled ordered sequence into a plurality of super pixels defined by a given number of said pixels, characterized in that: one or more levels of dot loading are used to achieve different values of gray level in a multiple-level gray table. This generic method is applicable to both ink jet and electrophotographic printing species of this invention. In one electrophotograpic printing species of this invention, there is disclosed a method of electrophotographic color printing which includes mixing a plurality of colors in a single plane and in dot-next-to-dot (DND) pixels within a plurality of super pixels to produce a color image, whereby the sum of the multi-color dots printed in any super pixel is limited to the number of subdivided individual pixels therein, thereby assuring dot-next-to-dot (DND) always printing of said colors in a single plane. The above method further includes varying the area of each printed color dot within each pixel of a super pixel in order to control the gray scale of a printed color image. Gray scale printing is achieved by controlling the selection of a gray table entry level number representative of one of several available entry level numbers corresponding to a plurality of different dot loadings for a corresponding plurality of differently printed super pixels.
A method of gray scale printing wherein each dot of a plurality of dots of one or more colors is printed within a pixel of a plurality of pixels and in a controlled dot-next-to-dot (DND) ordered sequence to form a plurality of super pixels defined by a given number of said pixels, characterized in that said method includes the steps of:
A method of monochromatic or color printing which comprises the steps of:
A method of gray scale printing of dots of one or more colors within a plurality of super pixels in a controlled ordered sequence including the steps of using one or more levels of dot loading in each of said super pixels to achieve one or more values of gray level of a multiple level gray table, and using dot-next-to-dot always (DNDA) formatting so that a number of dots printed in each super pixel never exceeds a number of individual or subdivided pixels therein and that there is never any dot-on-dot color mixing within said super pixels.
A method for gray scale printing of one or more colors which comprises the steps of:
A method for gray scale color printing which includes the steps of:
A method of electrophotographic color printing which includes mixing a plurality of colors in a single plane and in dot-next-to-dot (DND) pixels within a plurality of super pixels to produce a color image, and printing with dot-next-to-dot always (DNDA) formatting within said super pixels to ensure that there is never any dot-on-dot color mixing within said super pixels, whereby the sum of the multi-color dots printed in any super pixel is limited to a number of subdivided individual pixels therein, thereby assuring dot-next-to-dot always (DNDA) printing of said colors in a single plane.
Dependencies are inferred from the claim text.