Xerox Corporation

Agfa Gevaert Nv

Agfa-geuaert N.v.

Jean-Pierre Van De Capelle

Joseph M Harrison

Baldewin Meireson

Louis Omer Joseph Pepin

Erik Sundermann

Howard E Vogl

Wim Geurts

A method and apparatus for adjusting estimated ink pile height to reduce the frequency and effects of a defect known as a halo defect. An estimated ink pile height profile of ink to be deposited on a surface in an area of image data having a foreground and a background is determined. The estimated ink pile height profile has a foreground color area including a top color component and at least one non-top color component in the foreground. Then, the estimated height profile is adjusted if the difference between the pile heights of the foreground and background is greater than a threshold condition.

Methods and apparatus for adjusting ink pile height

A color rendering system and method is disclosed. The color rendering system comprising a color rendering strip generation system configured to generate a group of one or more sets of comparison patches. Each set of comparison patches associated with a particular color and including different color space representations of the color associated with the set.

Color rendering control system

A method and apparatus to predict the color of an overprint of a set of colorants at a set of respective coverage percentages on a substrate of a substrate type using a printing technique. The colorants include some for which a device profile is provided. The method includes determining the colorant parameters of the device profile colorants; determining the spectrum of the substrate, providing spectral colorant parameters for the non-device profile colorants, and determining the color of the overprint. One version including modifying the data of the device profile such that the colorant parameters determined in the step of determining colorant parameters determines the colorant parameters of modified colorants that match the color of the device profile colorants and that cover at least the gamut of the device profile colorants. In one version, the step of determining the determining the color of the overprint includes determining the coverage percentages of the modified colorants corresponding to the colorants of each subset, and using the coverage percentages of the modified colorants to determine the color of the overprint.

Method and device for determining the color appearance of color overprints

A method to convert a color provided in a first color space into a color in a second color space defined by more than four colorants and a reproduction process. The method includes converting the color into a third color space, determining which of a set of gamut volumes defined in the third color space is appropriate for the color, with each point in the gamut volume achievable by an area coverage greater than zero and less than 100% of two of the colorants and an area coverage greater than zero and less than 100% of one or more darkening colorants with the remaining colorants either absent or at 100%. The method further includes carrying out any gamut mapping on the converted color so that the converted color is in the appropriate gamut volume and converting the gamut mapped color from the third color space into a set of the colorants of the second color space, such that the surface of any gamut volume with no darkening colorant is part of an umbrella surface for the N inks.

Growing community of inventors

Rochester, NY, United States of America

Jean-Pierre Van De Capelle