公开(公告)号：US20210004654A1

公开(公告)日：2021-01-07

申请号：US16976876

申请日：2018-03-08

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Peter MOROVIC ,  Jan MOROVIC ,  Pere GASPARIN TALARN ,  Victor DIEGO GUTIERREZ ,  Javier MAESTRO GARCIA

IPC: G06K15/02 ,  G06K15/00

Abstract: Certain examples described herein relate to printer calibration. In some cases, adjustment data is received, indicating an adjustment to be applied to a given colorant. A Neugebauer Primary area coverage (NPac) vector defining an operating set of Neugebauer Primaries (NPs) is obtained. Configuration data is determined, dependent on the operating set of NPs. The configuration data maps colorant adjustments to relationships between NPs in the operating set, for both an increase and a decrease in the given colorant. In some cases, the configuration data and the adjustment parameters are used to identify first and second subsets of the operating set of NPs. The NPac vector is adjusted by decreasing an area coverage of an NP in the first subset and complementarily increasing an area coverage of an NP in the second subset.

公开(公告)号：US20210056367A1

公开(公告)日：2021-02-25

申请号：US16979048

申请日：2018-04-06

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Javier MAESTRO GARCIA ,  Jan MOROVIC ,  Peter MOROVIC

IPC: G06K15/02 ,  G01J3/46

Abstract: Certain examples described herein relate to mapping between an input color space and an output color space. In some cases, data representing a set of candidate output color values in the output color space is obtained for a transition region between two input color values in the input color space. A sub-region of the transition region is defined, the sub-region being associated with a target colorimetry and a target value of a metric. An output color value is selected from the set of candidate output color values. The output value has an associated value of the metric and an associated colorimetry. The selecting is based on the associated colorimetry and the target colorimetry, and the value of the metric and the target value of the metric. In some cases, mapping data is generated by assigning the selected output color value to the sub-region.

公开(公告)号：US20210368067A1

公开(公告)日：2021-11-25

申请号：US16979070

申请日：2018-04-06

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Javier MAESTRO GARCIA ,  Jan MOROVIC ,  Peter MOROVIC

IPC: H04N1/52 ,  H04N1/60 ,  G06K15/02 ,  H04N1/40 ,  G01J3/46 ,  G01J3/50

Abstract: Certain examples described herein relate to color spaces. In some cases, data representing a set of color values is obtained. Each color value has, for each of first, second and third axes defining a three-dimensional color space, a respective coordinate value. In some cases, for each of the set of color values, the coordinate value for the first and/or second axis is transformed dependent on the coordinate value for the third axis, to generate data representing a transformed set of color values. A set of output color values in an output color space is derived using the generated data. Output data associating the set of output color values in the output color space with a set of further color values in a further color space is generated.

公开(公告)号：US20230144915A1

公开(公告)日：2023-05-11

申请号：US17996903

申请日：2020-04-24

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Javier MAESTRO GARCIA ,  Marti RIUS ROSSELL ,  Joan VIDAL FORTIA ,  Peter MOROVIC

IPC: H04N1/52 ,  H04N1/60

CPC classification number: H04N1/52 ,  H04N1/6075

Abstract: Certain examples described herein relate to halftone level adjustment for Neugebauer Primaries (NPs). In certain examples, halftone levels for NPs are obtained for a halftone for printing an image. It is determined whether the halftone corresponds to a line or an area fill. The halftone levels may be adjusted in response to these levels exceeding a printing attribute threshold. The printing attribute threshold may be dependent on whether the halftone corresponds to a line or an area fill. The image may then be printed using the adjusted halftone levels.

公开(公告)号：US20200177768A1

公开(公告)日：2020-06-04

申请号：US16616461

申请日：2017-07-24

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Peter MOROVIC ,  Jan MOROVIC ,  Jordi ARNABAT BENEDICTO ,  Javier MAESTRO GARCIA

IPC: H04N1/60 ,  G06T1/20 ,  H04N1/00

Abstract: Methods for printer color calibration are disclosed. A nominal Neugebauer Primary area coverage (NPac) vector from an NPac space is then determined from a color mapping, the nominal NPac vector corresponding to a given color value in a color space. One or more colorant calibration factors each associated with a color of colorant are received; the calibration factors representing operational characteristics of the printer. One or more optimization metrics for constraining desired properties of an objective calibrated NPac vector to be generated are also received. The calibrated NPac vector is generated based on the nominal NPac vector such that: the generated calibrated NPac vector is convex; and for each given color of colorant the usage of colorant associated with the generated calibrated NPac vector is equal to the product of usage of colorant associated with the nominal NPac vector; and the calibration factor for the given color of colorant.