Hewlett-packard Development Company, L.p.

Matthew Alan MacClary

Kevin G Currans

Santiago Garcia-Reyero Vinas

Jose Galmes

Lluis Abello Rosello

Cesar Fernandez Espasa

John A Bertani

Jon Derek Roller

Daniel Edgar Robin

Steven Eric Sneller

Frank Perdicaro

Stephen L Albright

Daniel Edgard Robin

In an example, an apparatus is described that includes a vision system and an image correction module. The vision system captures an image of a multi-lane print output. The image correction module receives the image of the multi-lane print output from the vision system and calculates a calibration to image data from which the multi-lane output is printed. The calibration minimizes visual variations between the multi-lane print output and a reference image.

Minimizing visual variations in multi-lane print outputs

A method of increasing data flow to a printing device includes, with a first raster image processor, converting a document into a first bitmap having a first dot density and representing a black color plane of the document; with a second raster image processor, converting the document into a second bitmap at a second dot density that is a relatively lower dot density than that of the first bitmap, the second bitmap representing other color planes of the document; and transmitting data of the first and second bitmaps to a printing device for printing to a print medium.

Data flow to a printing device

According to one example, there is provided a method of duplex printing. The method comprises printing recto pages and associated recto checkmarks on a first side of a web and printing verso pages and associated verso checkmarks on a second side of a web, the length of each successively printed recto and verso checkmark varying in accordance with a respective recto and verso checkmark length sequence, determining the length of successive printed verso and recto checkmarks and determining their sequence position in the appropriate checkmark length sequence, and determining whether a print error has occurred based on the determined recto and verso checkmark sequence positions.

Duplex printing

A method for applying a bonding agent for supplemental ink includes, with a control system of a printing apparatus, determining regions of an image corresponding to regions where a supplemental ink is to be printed, and with the control system, adding an amount of pixels of a standard color channel to portions of a bitmap representing the image, the portions corresponding to the regions where the supplemental ink is to be printed. The amount of pixels is sufficient to trigger application of a bonding agent at the regions.

Applying bonding agent for supplemental ink

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Corvallis, OR, United States of America

Matthew Alan MacClary