Hewlett-packard Development Company, L.p.

Yvan Richard

Jan Morovic

Michel Georges Encrenaz

Johan Maurice Lammens

Peter Morovic

Jordi Arnabat Benedicto

Manuel Angel Alberran Moyo

A color transformation table is constructed in an imaging device. Unsmoothed entries are placed in a table. The unsmoothed entries are replaced by smoothed entries. The smoothed entries are indexed by a color dimensional value for each color dimension in a first color space. Each smoothed entry is a color dimensional value for a color dimension within a second color space. A first unsmoothed entry is replaced with a first smoothed entry, so that the first smoothed entry is a weighted mean of a subset of unsmoothed entries. The subset of unsmoothed entries includes the first unsmoothed entry and other unsmoothed entries that are indexed by the same color dimensional values as the first unsmoothed entry for all but a first color dimension in the first color space.

Smoothed entries in a color transformation look-up table

A method of printing using variable pixel replication factors involves generating from an input image a reference image and a plurality of half-tone source images generated at different resolutions of the input image and with post-halftoning pixel replication factors applied such that the half-tone source images are all the same size. A pixel-replication factor selector function is applied to each reference pixel of the reference image to determine a respective source image for that reference pixel. Thus, different reference pixels correspond to different pixel replication factors. A print-state image is assembled by applying to each print-state image pixel the print state of the corresponding source pixel in the corresponding source image. The print-state image is then printed to a print medium.

Printing using variable pixel-replication factors

The disclosure describes methods for color printing, performing a color separation process and performing a halftoning process. Furthermore, the disclosure describes the color separation process determining one or more Neugebauer Primaries, tessellating the Neugebauer Primaries, and generating one or more Neugebauer Primary area coverage vectors, whose area coverages are linear with respect to a device-independent color space. The disclosure further describes that the color separation process communicates with the halftoning process using one or more Neugebauer Primary area coverage vectors.

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Barcelona, Spain

Yvan Richard