公开(公告)号：WO2021080603A1

公开(公告)日：2021-04-29

申请号：PCT/US2019/058086

申请日：2019-10-25

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

Inventor： BEN-YAAKOV, Dan ,  WAIDMAN, Ran ,  GUTTMAN, Nir

IPC: H04N1/60 ,  G06F3/12

Abstract: In an example, a method comprises: receiving, at a raster image processor, image data representing a print job, the image data representing an area to be printed using a process color separation and an area to be printed using a spot color; producing at the raster image processor, a first rasterized image representing a layer of the print job having the process color and a second rasterized image representing a layer of the print job having the spot color; receiving at an emulator, the second rasterized image; and representing, by the emulator, the second rasterized image as a plurality of constituent process color separation layers.

公开(公告)号：WO2019177590A1

公开(公告)日：2019-09-19

申请号：PCT/US2018/022152

申请日：2018-03-13

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

Inventor： GUTTMAN, Nir ,  BEN YAAKOV, Dan ,  BERKOVICH, Ziv

IPC: G01J3/46 ,  G01N21/33

Abstract: A method is provided. The method comprises receiving a signal representative of a first combined spectrophotometric response of a substrate and deposited colorant. The first combined spectrophotometric response is indicative of a combined reflectance of the substrate and deposited colorant under a first illumination condition. The method further comprises determining, from the received signal, and from a contribution term indicative of an effect of ultra-violet, UV, light on a combined reflectance of the substrate and deposited colorant, an estimate for a second combined spectrophotometric response of the substrate and deposited colorant under a second illumination condition. The first illumination condition or the second illumination condition is a UV-cut illumination condition.

公开(公告)号：WO2022055487A1

公开(公告)日：2022-03-17

申请号：PCT/US2020/050155

申请日：2020-09-10

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

Inventor： WAIDMAN, Ran ,  GUTTMAN, Nir ,  NEGREANU, Eyal

IPC: G03G15/10

Abstract: Examples include a method for operating a liquid toner electrophotography printer. The method comprises monitoring an optical density of images printed by the printer, storing a first cumulative optical density change value induced by developer voltage changes, and storing a second cumulative optical density change value induced by electrode voltage changes. The method also comprises detecting that the monitored optical density deviates from an operational optical density profile. The method also comprises, in response to the deviation of the monitored optical density, comparing the first cumulative stored cumulative optical density change value to the second cumulative optical density change value; and changing either a developer voltage or an electrode voltage to maintain an optical density change differential between the first cumulative optical density change value and the second cumulative optical density change value within an operational optical density change differential profile.

公开(公告)号：WO2021010998A1

公开(公告)日：2021-01-21

申请号：PCT/US2019/042270

申请日：2019-07-17

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

Inventor： LANDAU, Yoav ,  WAIDMAN, Ran ,  GUTTMAN, Nir

IPC: G03G15/10 ,  G03G21/00 ,  H04N1/60

Abstract: An example of printing calibration includes printing a calibration page having test patches, the test patches developed at a plurality of voltages of a binary ink developer. The test patches are measured to determine an indication of ink thickness of the patches and a calibration voltage is generated based on the indications of the ink thickness of the test patches.