Hp Indigo B.v.

Hewlett-packard Development Company, L.p.

Hewlett-packard Indigo B.v.

Gregory Braverman

Carl Staelin

Renato Keshet

Gideon Amir

Shlomo Harush

Eyal Shelef

Ran Waidman

Ruth Bergman

Oren Haik

Mani Fischer

Marie Vans

Sasi Moalem

Noam Shaham

Oded Perry

Ram Dagan

Darryl Greig

Nir Guttman

Yohanan Sivan

Liron Itan

Mirta Perlman

Pavel Kisilev

Michal Aharon

Michael Plotkin

Haim Livne

Lior Shapira

Tal Frank

Craig Breen

Boris Oicherman

Noam Parvin

Maya Shalev

Barak Markus

Gidl Amir

Eyol Shalef

Tal Framk

Dan Ben Yaakov

Erez Kopel

Idan Federman

Moshe Birenboim

Haim Livine

A method of printing comprises executing an output settings calibration procedure, the procedure comprising: depositing, by one or more printing elements, ink onto a first substrate according to respective output settings. The procedure further comprises measuring, by a sensor, an actual color value of the ink deposited onto the first substrate at each of a plurality of locations. The procedure further comprises determining a difference between the actual color value and a target color value for each of the plurality of locations and determining adjusted respective output settings for each of the plurality of locations based on the determined difference. The method further comprises depositing, by the one or more printing elements, ink onto a second substrate according to the adjusted respective output settings.

Method and printer system for determining adjusted output settings

Examples analyze a digital image to determine an amount of high-frequencies corresponding to each pixel of the digital image based at least in part on gradients corresponding to a pixel neighborhood of each pixel. Examples analyze the digital image to determine a degree of randomness for each pixel based at least in part on the corresponding gradients. Examples generate an activity mask for the digital image based at least in part on the amount of high-frequencies and the degree of randomness corresponding to each pixel. Examples process the pixels of the digital image by performing gray component replacement to generate a color transformed image based at least in part on the activity mask.

Gray component replacement in a digital image to generate a color transformed image

A method of adjusting an imaging apparatus comprises printing a set of test patches, the set of test patches comprising a solid color patch, a grey level patch and a substrate patch. The optical densities of the set of test patches are determined. The method comprises simultaneously correcting a solid optical density value (Solid OD), relating to the solid color patch and an associated grey level (LUT) value relating to the grey level patch.

Adjusting imaging apparatuses

An apparatus to calibrate a printer. The apparatus comprises a controller to: control deposition of white printing material on media, the white printing material having an opacity of at least 55%; control deposition of non-white printing material on the white printing material; receive data for at least one sensed characteristic of the non-white printing material; and calibrate the printer using the received data for the at least one sensed characteristic of the non-white printing material.

To calibrate a printer

An example method of controlling a printing process in accordance with aspects of the present disclosure includes controlling an optical density of a printed image such that the optical density is increased for a predetermined portion of a leading edge of a page.

Method of controlling a printing process and controller therefor

A method comprises computing an activity map for an input image. The activity map indicates an amount of variable spatial activity in the input image. The method further comprises producing an output image based on the activity map, and controlling a printhead to cause the output image to be printed. The output image contains a plurality of color pixels and each such color pixel is represented by at least one of cyan (C), magenta (M), yellow (Y), and black (K) in a color space.

Determining new color values of an image based on an activity map

A method of enabling preparing a printing system calibrated with a first halftone screen for printing with a second halftone screen. The calibration is represented by calibration data. Calibration data for the second halftone screen is produced from the existing calibration data of the first halftone screen without resorting to previous calibration data for the second halftone screen, based on correlation data which represent a first-order correlation between the halftone screens.

Halftone printing with different screens

A correction method for correcting unintended spatial variation in lightness across a physical image produced by a xerographic process, the method comprising producing a test image using the xerographic process, measuring a difference between actual lightness and intended lightness across at least part of the test image, and varying the light source level used subsequently in the xerographic process to correct for the measured unintended difference.

Correction method, apparatus, data carrier or system for correcting for unintended spatial variation in lightness across a physical image produced by a xerographic process

A method for a digital printing press includes estimating a developer voltage by applying a developer voltage estimation model to measurements of state parameters of the digital printing press.

Ink thickness consistency in digital printing presses

The present invention generally provides methods and systems for printing. A statistical learning system is used to determine dot gain.

Systems and methods for dot gain determination and dot gain based printing

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Nes Ziona, Israel

Gregory Braverman