Hewlett-packard Development Company, L.p.

Maria Isabel Borrell Bayona

Sergio Puigardeu Aramendia

Luis Garcia

Angel Martinez Barambio

Jordi Sender Beleta

Marina Cantero Lazaro

Alex Campa Coloma

Diana Canto Estany

Jordi Bas Ferrer

Adria Gallart Del Burgo

There is disclosed a method comprising determining, by a processor, if there are consecutive nozzles of a print apparatus that are occluded by a contaminant; and, when a predetermined number of consecutive nozzles are occluded, automatically triggering a cleaning operation to at least partially remove the contaminant.

Cleaning nozzles of a print apparatus

In an example print system including a mask engine and print engine, the mask engine is able to cause generation of print masks with disabled sections that are non-overlapping. In an example method of printing, a number of passes over a zone of media is identified, a plurality of print masks corresponding to the zone are generated with a disabled section of pixels that are non-overlapping, and the number of passes are printed based on the plurality of masks such that the disable pixels in each print mask are in a different relative position with respect to a location of the media.

Print masks with disabled sections

Certain examples described herein relate to evaluating print quality. In these examples, a check image is printed at a first print quality in accordance with test image data for at least one test image, and a reference image is printed at a second print quality with reference image data corresponding to the one or more test images modified to simulate one or more print defects. A comparison of the printed reference image and the printed check image allows evaluation of a quality level for the printed check image.

Print quality evaluation

As one example, a printer includes a density calculator to determine a content density of data on page to be printed and a controller. In that example, the controller may perform operations to determine a dry time for a swath of the page to be printed based on the content density and an environmental variable and adjust a parameter for the page to be printed to mitigate a drying time of the page to be printed based on the dry time determined for the swath.

Managing printer dry time

One example includes a printer () having a calculator () to determine plot density of a printer content page (). A controller () is provided to set a print parameter based on the determined plot density for the printer content page () to mitigate dry time for a printed output page ().

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Sant Cugat del Valles, Spain

Maria Isabel Borrell Bayona