Abstract: 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.

Abstract: A method and a print apparatus are described. The method and the print apparatus allow for selecting from a plurality of print modes a print mode for a whole page of a document to be printed dependent on a print material coverage of the whole page of the document to be printed.

Abstract: 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.

Abstract: 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.

Abstract: A printing system includes first and second printheads spaced apart so as to define a gap between the first and second printheads. A controller is configured to the control printheads, including establishing a swath height based on the gap.

Abstract: In a method for printing a plurality of pixels, each pixel of a plurality of pixels is printed by controlling an inkjet print head to provide for each pixel at least two ink drops at different positions in a print head movement direction, the print head having a plurality of trenches supplying ink to a plurality of sets of nozzles. The at least two ink drops forming first pixels of said plurality of pixels are fired from the same trench.

Abstract: A method for automated alignment adjustment of a printing head includes determining a current drop velocity for the printing head based on a cumulative amount of ink that was dispensed by the printing head. An alignment adjustment on the printing head is performed to compensate for a change in the drop velocity based on the current drop velocity. A computer readable medium containing executable instructions and a system are also described.

Abstract: A method performed by a printing system is described herein. A request is provided to a user to enter data related to print quality of a mark or marks printed on a portion of a background region. The background region includes an area or areas treated with a fixer fluid applied by a printhead. A user input is received associated to the request. A misalignment of the printhead is estimated in accordance with the user input. A printing system and a tangible machine readable storage medium are also described herein.

Abstract: A method for automated alignment adjustment of a printing head includes determining a current drop velocity for the printing head based on a cumulative amount of ink that was dispensed by the printing head. An alignment adjustment on the printing head is performed to compensate for a change in the drop velocity based on the current drop velocity. A computer readable medium containing executable instructions and a system are also described.

Abstract: Print heads and print head fluids are disclosed. An example print head for an inkjet printer system includes a fluid reservoir, and a nozzle fluidically connected to the fluid reservoir. The example print head also includes a fluid having a liquid vehicle component and a tinting dye. The fluid is provided in the fluid reservoir during shipping of the print head to maintain wetting of the print head. The fluid is discharged after installation of the printer head in the inkjet printer system.

Abstract: A method of printing a document using a fluid-ejection printing device includes receiving gray scale image data for the document, and identifying at least one area fill feature of the image data. It is determined whether the at least one area fill feature will be printed with a combination of different black inks and is likely to produce a visible image defect if printed in an N-pass bidirectional print mode, where N is an integer. Non-fill regions of the image data are printed using the N-pass bidirectional print mode. The method further includes automatically switching to an M-pass bidirectional print mode for printing the at least one area fill feature when it is determined that the at least one area fill feature will be printed with a combination of different black inks and is likely to produce a visible image defect, where M is an integer greater than N.

Abstract: A printing system includes first and second printheads spaced apart so as to define a gap between the first and second printheads. A controller is configured to the control printheads, including establishing a swath height based on the gap.

Abstract: In one embodiment, a plot width for an image to be printed is determined. A carriage return time that is a function of the plot width and a first carriage speed in a first printmode is calculated. A change is made from the first printmode to a second printmode according to an objective if the carriage return time is less than a media advance time.

Abstract: A method for pen drop weight calibration includes altering an image prior to printing based on the difference in printing performance of a first pen and a second pen to produce altered image data, the first pen and the second pen being disposed in the same printer. The altered image data is then printed with the printer.

Abstract: A method for pen drop weight calibration includes altering an image prior to printing based on the difference in printing performance of a first pen and a second pen to produce altered image data, the first pen and the second pen being disposed in the same printer. The altered image data is then printed with the printer.

Abstract: A method of printing a document using a fluid-ejection printing device includes receiving gray scale image data for the document, and identifying at least one area fill feature of the image data. It is determined whether the at least one area fill feature will be printed with a combination of different black inks and is likely to produce a visible image defect if printed in an N-pass bidirectional print mode, where N is an integer. Non-fill regions of the image data are printed using the N-pass bidirectional print mode. The method further includes automatically switching to an M-pass bidirectional print mode for printing the at least one area fill feature when it is determined that the at least one area fill feature will be printed with a combination of different black inks and is likely to produce a visible image defect, where M is an integer greater than N.

Abstract: A method and a print apparatus are described. The method and the print apparatus allow for selecting from a plurality of print modes a print mode for a whole page of a document to be printed dependent on a print material coverage of the whole page of the document to be printed.

Abstract: In a method for printing a plurality of pixels, each pixel of a plurality of pixels is printed by controlling an inkjet print head to provide for each pixel at least two ink drops at different positions in a print head movement direction, the print head having a plurality of trenches supplying ink to a plurality of sets of nozzles. The at least two ink drops forming first pixels of said plurality of pixels are fired from the same trench.

Abstract: In one embodiment, a plot width for an image to be printed is determined. A carriage return time that is a function of the plot width and a first carriage speed in a first printmode is calculated. A change is made from the first printmode to a second printmode according to an objective if the carriage return time is less than a media advance time.

Abstract: An inkjet printer is used to print on media an amplitude modulated (AM) halftoning pattern where dot size is varied to create different tones. Different sized dots are formed on the media by depositing different patterns of adjacent drops that coalesce into the different sized dots.