Hewlett-packard Development Company, L.p.

Jaime Fernandez Del Rio

Jacint Humet Pous

Eduardo Amela Conesa

Marc Serra Vall

Utpal Kumar Sarkar

Jesús García Maza

Andreas Mueller

An apparatus and method for controlling a printing device are described. In examples, a printing device has a first printhead interface, a first printhead for use in applying a treatment fluid to a print medium and a second printhead interface, a second printhead for use in applying ink to the print medium. The first and second printhead interfaces are consecutively aligned along a common axis and each printhead has a plurality of nozzles that extend in a direction of relative movement of the print medium in relation to said printheads. An example apparatus then has a controller arranged to, when the printheads are installed, configure activation of nozzles of at least one of the first and second printheads in the direction of relative movement to spatially offset useable nozzles of the first printhead with respect to useable nozzles of the second printhead in said direction.

Apparatus and method for controlling a printing device

The present disclosure is related to deposition of print treatments. In an example, treatment is to be deposited on substrate dot locations to receive ink according to selected treatment-to-ink regimes. The selected treatment-to-ink regimes include a variable treatment-to-ink regime and a constant treatment-to-ink regime. The variable treatment-to-ink regime is for depositing a variable amount of treatment dependent on the amount of ink to be deposited in a substrate dot location when the ink amount in the substrate dot location is below a threshold. The constant treatment-to-ink regime is for depositing a selected constant amount of treatment in a substrate dot location and an area surrounding the substrate dot location when the ink amount in the substrate dot location is above the threshold. Other examples are illustrated herein.

Deposition of print treatment

Application of treatments for treating a colorant for printing an image is described herein. In an example, an amount of a treatment to be applied on a substrate portion is determined considering color calibration of a printing system for specific conditions of printing the image. The treatment is for treating the amount of colorant on the substrate portion.

Techniques related to printing

An apparatus and method for use in printing a swath in a multipass printing device are disclosed. The method comprises selectively depositing a drop of ink associated with a pixel to be printed on a print media based on a substantially uniform print mask function during a first pass of a print head, and selectively depositing a further drop of ink associated with the pixel on the print media based on a ramp print mask function during a further pass of the print head.

Printing method and apparatus

According to one example, a printer includes an inkjet printhead, and the printhead comprises nozzles through which printing fluid is ejectable during a pass of the printhead across a print zone. Processing printhead control data includes obtaining printhead control data describing pixel locations in an image to be printed on a media, and allocating, for a swath of the image, each of the pixel locations to a printhead nozzle and to a print pass of a set of print passes in accordance with a print mask. The print mask defines sections associated different groups of the nozzles.

Processing printhead control data and printing system

According to one example, there is provided a method of calibrating a printing system. The printing system is configured to supply print media and calibration media to a print zone. The method comprises controlling the printing system to position calibration media in the print zone, printing a predetermined set of color patches on the calibration media, measuring color characteristics of the printed set of color patches, and comparing the measured color characteristics with a set of reference color characteristics. The method further comprises calibrating the printing system based on the compared characteristics.

Growing community of inventors

San Diego, CA, United States of America

Jaime Fernandez Del Rio