Abstract: A method of printing including replacing each of black dots of a first subset of black dots of a bit map for a predetermined area with a process black dot, adding a non-black dot to each of black dots of a second subset of black dots of the bit-mapped data, and printing the bit map.

Abstract: A method of printing including changing each process black dot and each black plus non-black dot of a halftoned bit map to a black dot, if each of first and second adjacent dots on either side of such process black dot or black plus dot along a predetermined axis comprises a black dot, a black plus non-black dot, a process black dot, or a white dot, and printing the bit map.

Abstract: A method of adjusting a non-black primary color value including determining first, second and third portions of the non-black primary color value; determining a first contribution using a first one-dimensional look-up table and the first portion, wherein the primary color value is used as an index to the first one-dimensional look-up table; determining a second contribution using a second one-dimensional look-up table and the second portion, wherein the primary color value is used as an index to the second one-dimensional look-up table; determining a third contribution using a third one-dimensional look-up table and the third portion, wherein the primary color value is used as an index to the third one-dimensional look-up table; and summing the first, second and third contributions.

Abstract: A method of adjusting a non-black primary color value including determining first, second and third portions of the non-black primary color value; determining an adjusted first portion using a first one-dimensional look-up table, wherein the first portion is used as an index to the first one-dimensional look-up table; determining an adjusted second portion using a second one-dimensional look-up table, wherein the second portion is used as an index to the second one-dimensional look-up table; and summing the adjusted first portion, the adjusted second portion and the third portion.

Abstract: A method to compensate for dot placement errors includes receiving image data comprising a plurality of pixels, each having at least two states, a first corresponding to depositing no ink and a second corresponding to depositing ink; identifying a stray pixel pattern within the image data, the stray pixel pattern including a stray pixel corresponding to a misplaced dot in a dot pattern; and modifying the image data corresponding to the stray pixel pattern by setting the stray pixel to the first state and changing a second pixel from the first state to the second state.

Abstract: A method of printing including changing each process black dot and each black plus non-black dot of a halftoned bit map to a black dot, if each of first and second adjacent dots on either side of such process black dot or black plus dot along a predetermined axis comprises a black dot, a black plus non-black dot, a process black dot, or a white dot, and printing the bit map.

Abstract: A method of printing including replacing each of black dots of a first subset of black dots of a bit map for a predetermined area with a process black dot, adding a non-black dot to each of black dots of a second subset of black dots of the bit-mapped data, and printing the bit map.

Abstract: A method of adjusting primary color data values including producing color saturation adjusted primary color data values that depend on a relative amount of chroma in the initial primary color data values.

Abstract: A method of gray balance adjustment and color saturation adjustment including generating respective gray balancing components for initial primary color data values, generating respective color saturation adjustment components for the initial primary color data values, and adding respective gray balancing components and respective color saturation adjustment components to produce respective gray balanced and color saturation adjusted primary color data values.

Abstract: A gray balancing technique wherein color data values are modified only if the color data values include a gray component.

Abstract: A gray balancing technique wherein gray balancing curves are determined by interpolating the primary color data values of color samples to determine discrete combinations of primary colors that substantially match predetermined targets, and performing a curve fitting procedure on the discrete combinations of primary colors to produce gray balancing curves.

Abstract: A method to compensate for dot placement errors includes receiving image data comprising a plurality of pixels, each having at least two states, a first corresponding to depositing no ink and a second corresponding to depositing ink; identifying a stray pixel pattern within the image data, the stray pixel pattern including a stray pixel corresponding to a misplaced dot in a dot pattern; and modifying the image data corresponding to the stray pixel pattern by setting the stray pixel to the first state and changing a second pixel from the first state to the second state.

Abstract: A method for halftoning a gray scale image to generate a halftoned image uses a stochastic screen is designed to provide visually pleasing, blue noise dot profiles when thresholded at any gray level and wherein substantially all the threshold values corresponding to gray levels between gs1 and gs2 coincide with black positions in a constraining checkerboard pattern and substantially all the threshold values corresponding to gray levels between gs2 and gs3 coincide with white positions in the constraining checkerboard pattern.

Abstract: A method of improving black print quality in a color printer having at least one color ink and black ink includes determining a location on a substrate where a black pixel is to be printed, printing a droplet of color ink at the location, and printing a droplet of black ink with the color droplet. If the color printer includes cyan, magenta and yellow, then a droplet of cyan ink, magenta ink or yellow ink may be printed with the droplet of black ink. For images containing black at a plurality of locations, the cyan, magenta and yellow droplets may be equally distributed among the plurality of locations. Alternatively, the cyan, magenta and yellow droplets may be distributed in accordance with a digital halftone screen.

Abstract: A color printing system with a data storage medium containing a first data set corresponding to a first halftone screen having a first screen matrix of threshold values. The first screen matrix has screen locations corresponding to the matrix of image data elements, and each screen location has a threshold value selected from a range of threshold values. The data storage medium includes a second data set corresponding to an second halftone screen having a second screen matrix of threshold values, each inversely related to the corresponding threshold value of the first screen. The data storage medium includes a third data set corresponding to a third halftone screen having a third screen matrix of threshold values each based on a difference between the first screen value for the corresponding location and a preselected intermediate value in the range of threshold values.

Abstract: The present invention provides a polyamide composition comprising: a polyamide containing an alkylene oxide group; and a metal salt. The polyamide composition of the present invention has long lasting antistatic properties and a lower surface resistivity than the polyamide alone.

Abstract: A method of operating a printing system that can print any of several different colors onto a point on a sheet of printer media. The method includes using a halftoning screen with a matrix of assorted threshold values, along with image data having a matrix of image data elements. For each data element and each color, a density value is determined to establish the amount of each color needed to produce the color associated with the original data element. Then a calculation determines which of the colors will be printed to the particular location. In a selected sequence of colors, density values of the colors are added one by one to generate a density sum that increases until it exceeds the threshold value. The last color added, which caused the sum to exceed the threshold, is then printed to the media sheet at a corresponding point.