Hewlett-packard Development Company, L.p.

Andreas Muller

Jan Morovic

Peter Morovic

Utpal Kumar Sarkar

Jacint Humet Pous

Pau Costal Fornells

Manuel Agudo Acemel

Ronald Albert Askeland

Antonio Gracia Verdugo

Howard Doumaux

Jordi Arnabat Benedicto

Juan Manuel Garcia Reyero Vinas

Mauricio Seras Franzoso

Michel Georges Encrenaz

Eduardo Amela Conesa

Kai-Kong Iu

Xavier Quintero Ruiz

Albert Franco Morera

Marta Ramis Llinares

Oscar Martinez Bailac

An example of a printing carriage system is disclosed. The example disclosed herein comprises a plurality of printheads, and a positioning mechanism. The plurality of printheads comprises a moveable printhead that is moveable with respect to other printheads from the plurality of printheads. The positioning mechanism is to move the moveable printhead from a first printhead position to a second printhead position.

Moveable printheads

The disclosure relates to a rendering apparatus, method and non-transitory machine-readable storage medium for determining a speed of a carriage during rendering of an image. A plurality of swaths of rendering fluid are deposited on a print target using a set of printheads moving across the print target. A temperature of a curing module is measured at a respective time of depositing each respective swath. An arrival time for each deposited swath to respectively arrive at the curing module is predicted. The speed of the carriage during depositing the plurality of swaths is determined based on the measured temperature of the curing module and predicted arrival time for each respective swath.

Determination of rendering speed based on the measured temperature of a curing module

A method for regulating a deposition characteristic of a rendering material in a rendering apparatus includes determining a status of material deposition structure, and adjusting a physical attribute of the material deposition structure.

Regulating deposition characteristics

The method may comprise depositing print agent of a particular color onto a printable substrate to form a patch of print agent. It may comprise directing radiation from a plurality of radiation sources onto the patch of print agent and onto the printable substrate. Also, may comprise detecting, using a sensor, radiation from the plurality of radiation sources which has been reflected from the printable substrate and radiation from the plurality of radiation sources which has been reflected from the patch of print agent. Further, may comprise measuring, for each of the plurality of radiation sources, an intensity of the radiation reflected from the printable substrate and an intensity of the radiation reflected from the patch of print agent. Also, may comprise selecting, based on the measured intensities, a radiation source of the sources to be associated with the print agent of the particular color.

Determining reflected light intensities of light sources

Herein is described a method of inkijet printing, and compositions and inksets for use in the method, the method comprising: printing onto a non-porous substrate an inkjet fixing composition comprising a cationic polymer in an amount of less than 5 wt. %; an organic acid in an amount of 3 wt. % or less; and a liquid vehicle; and printing a latex-containing inkjet ink composition onto the non-porous substrate.

Method of inkjet printing and fixing composition

A color calibration chart may be created including a plurality of colors that are variations of a print color established for printing a reference color by a printing system using multiple colors. The colors in the calibration chart may be measured. A color from the calibration chart may be selected for printing the reference color which has a measurement value indicative of a color consistency within a predefined distance from a reference value for the print color.

Color calibration

A processing apparatus is provided. The processing apparatus includes a controller to process information as part of a Halftone Area Neugebauer Separation printing process to use at least one opaque ink as a process colorant in combination with at least one further process colorant.

To process information to use at least one opaque ink as a process colorant

In some examples, a printing system includes a printhead comprising a nozzle array including plural columns of nozzles to deliver printing fluid to a print medium, wherein nozzles in a first column of the columns are offset from nozzles in a second column of the columns. A controller is to control printing onto the print medium using the printhead by, for each respective pass of a plurality of passes of the printhead over the print medium, controlling an advance of the print medium for a print mask pattern that controls firing of the nozzles of the printhead, where the controlled advance of the print medium causes nozzles from different columns of nozzles of the nozzle array to deliver dots of printing fluid to a given row of a swath in successive passes of the plurality of passes.

Controlling advance of print media to deliver printing fluid from plural columns of nozzles

A test chart having printed regions is output at respective ink densities. An indication of a selected ink density is received. One or more resources of a printing device are determined according to the selected ink density to control one or more ink limits and a color separation of the printing device.

Method and apparatus for print control

In some examples, a printing system includes a printhead comprising a nozzle array including plural columns of nozzles to deliver printing fluid to a print medium, wherein nozzles in a first column of the columns are offset from nozzles in a second column of the columns. A controller is to cause introduction of a grain pattern into an image printed using the printhead onto the print medium by, for each respective pass of a plurality of passes of the printhead over the print medium, controlling an advance of the print medium by an uneven advance step for a print mask pattern that controls firing of the nozzles of the printhead, where the advance of the print medium by the uneven advance step causes an irregular pattern of firing of the nozzles of the printhead in successive passes of the plurality of passes.

Introducing grain patterns into images

Embodiments of the present invention provide a method for use in a printing device, comprising outputting a test chart comprising a plurality of printed regions at respective ink densities, receiving an indication of a selected ink density, and determining one or more resources of the printing device according to the selected ink density to control one or more ink limits and a color separation of the printing device.

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Barcelona, Spain

Andreas Muller