Abstract: A method for printing an image with authentication features, including: printing a media treatment material onto a print medium in accordance with a pattern of predefined authentication features, and printing one or more visible printing materials onto the print medium in accordance with an image pattern, thereby providing a printed visible image. The media treatment material, the one or more visible printing materials and the print medium interact to produce surface deformations of the print medium. Characteristics of the surface deformations are different in image regions where the media treatment material was printed than in image regions where the media treatment material was not printed, so that the difference between the characteristics of the surface deformations causes the pattern of authentication features to be detectable.

Abstract: A method for controlling a printing system adapted to print images on a web of media that is photoelastic and at least partially transparent. One or more printing stations are used deposit a pattern of printing material on a web of media travelling along a web transport path, thereby producing a printed image. A pattern of stress in the web of media is measured using one or more photoelastic measurement devices disposed along the web transport path, wherein the pattern of stress is at least partially induced by the deposited printing material. The measured pattern of stress is analyzed to detect the presence of one or more print defects, and a at least one aspect of the printing system is controlled responsive to detecting a print defect.

Abstract: A print media moving apparatus includes a vacuum assembly positioned immediately upstream relative to a roller. The vacuum assembly has an arcuate surface including three sections with the second section located between the first and third sections. The arcuate surface includes an extremum in the second section. The roller, having a diameter and rotational axis, includes three sections with the second section located between the first and third section as viewed along the rotational axis. The diameter of the roller in the first and third sections is greater than in the second section. The three sections of the vacuum assembly correspond to the three sections of the roller such that the contour of the arcuate surface causes the print media, after leaving the vacuum assembly, to contact the first and third sections of the roller prior to contacting the second section of the roller.

Abstract: A printing system is used printing an image on a web of media that is photoelastic and at least partially transparent. A web advance system advances the web of media supplied from an input roll in an in-track direction along a web transport path. At least one printing station is disposed along the web transport path for printing on the web of media. One or more photoelastic measurement devices disposed along the web transport path for characterizing stress in the web of media, and a controller that controls at least one aspect of the printing system responsive to signals received from the one or more photoelastic measurement devices.

Abstract: A print media moving apparatus includes a vacuum assembly positioned immediately upstream relative to a roller. The vacuum assembly has an arcuate surface including three sections with the second section located between the first and third sections. The arcuate surface includes an extremum in the second section. The roller, having a diameter and rotational axis, includes three sections with the second section located between the first and third section as viewed along the rotational axis. The diameter of the roller in the first and third sections is greater than in the second section. The three sections of the vacuum assembly correspond to the three sections of the roller such that the contour of the arcuate surface causes the print media, after leaving the vacuum assembly, to contact the first and third sections of the roller prior to contacting the second section of the roller.

Abstract: A method for controlling a digital printing system to print digital image data for an image region onto a continuous web of print media. An image region database stores data characterizing a plurality of reference image regions, each reference image region having one or more associated system control parameters that are appropriate for use in printing the reference image region. The system control parameters can include parameters related to correcting color registration errors. The image region to be printed is compared with the reference image regions in the image region database, and a similar reference image region is selected. The image region is printed using the system control parameters associated with the selected similar reference image region.

Abstract: A method for controlling a digital printing system to print digital image data for an image region. An image region database stores data characterizing a plurality of reference image regions, each reference image region having one or more associated system control parameters that are appropriate for use in printing the reference image region. The system control parameters can include parameters related to correcting color registration errors. The image region to be printed is compared with the reference image regions in the image region database, and a similar reference image region is selected. The image region is printed using the system control parameters associated with the selected similar reference image region.

Abstract: A print media moving apparatus includes a transport member positioned immediately upstream relative to a roller. The transport member has an operative surface with an arcuate profile, forming an air gap between the operative surface and the print media. An air clamp controls air flow in the air gap. The transport member includes three sections with the second section located between the first and third sections. The roller, having a diameter and rotational axis, includes three sections with the second section located between the first and third section and corresponding to the sections of the transport member. The diameter of the roller in the first and third sections is greater than in the second section. The transport member causes the print media, after leaving the transport member, to contact the first and third sections of the roller prior to contacting the second section of the roller.

Abstract: A print media moving apparatus includes a transport member positioned immediately upstream relative to a roller. The transport member has an operative surface with an arcuate trailing surface, forming an air gap between the operative surface and the print media. An air clamp controls air flow in the air gap. The transport member includes three sections with the second section located between the first and third sections. The roller, having a diameter and rotational axis, includes three sections with the second section located between the first and third section and corresponding to the sections of the transport member. The diameter of the roller in the first and third sections is greater than in the second section. The transport member causes the print media, after leaving the transport member, to contact the first and third sections of the roller prior to contacting the second section of the roller.

Abstract: A method for controlling a digital printing system to print digital image data for an image region onto a continuous web of print media. An image region database stores data characterizing a plurality of reference image regions, each reference image region having one or more associated system control parameters that are appropriate for use in printing the reference image region. The system control parameters can include parameters related to correcting color registration errors. The image region to be printed is compared with the reference image regions in the image region database, and a similar reference image region is selected. The image region is printed using the system control parameters associated with the selected similar reference image region.

Abstract: A method for controlling a digital printing system to print digital image data for an image region. An image region database stores data characterizing a plurality of reference image regions, each reference image region having one or more associated system control parameters that are appropriate for use in printing the reference image region. The system control parameters can include parameters related to correcting color registration errors. The image region to be printed is compared with the reference image regions in the image region database, and a similar reference image region is selected. The image region is printed using the system control parameters associated with the selected similar reference image region.

Abstract: A method for controlling an electrophotographic printing system to print digital image data for an image region. An image region database stores data characterizing a plurality of reference image regions, each reference image region having one or more associated system control parameters that are appropriate for use in printing the reference image region. The system control parameters can include parameters related to correcting color registration errors. The image region to be printed is compared with the reference image regions in the image region database, and a similar reference image region is selected. The image region is printed using the system control parameters associated with the selected similar reference image region.

Abstract: A method for controlling an electrophotographic printing system to print digital image data for an image region. An image region database stores data characterizing a plurality of reference image regions, each reference image region having one or more associated system control parameters that are appropriate for use in printing the reference image region. The system control parameters can include parameters related to correcting color registration errors. The image region to be printed is compared with the reference image regions in the image region database, and a similar reference image region is selected. The image region is printed using the system control parameters associated with the selected similar reference image region.

Abstract: A print media moving apparatus includes a vacuum assembly positioned immediately upstream relative to a roller. The vacuum assembly has a multiple vacuum manifolds forming an arcuate surface including three sections with the second section located between the first and third sections. The arcuate surface includes an extremum in the second section. The roller, having a diameter and rotational axis, includes three sections with the second section located between the first and third section as viewed along the rotational axis. The diameter of the roller in the first and third sections is greater than in the second section. The three sections of the vacuum assembly correspond to the three sections of the roller such that the contour of the arcuate surface causes the print media, after leaving the vacuum assembly, to contact the first and third sections of the roller prior to contacting the second section of the roller.

Abstract: A method for correcting color registration errors for a print job including one or more documents having a plurality of color planes. A color registration error model is used to predict a color registration error value for a document as a function of ink coverage characteristics for the document, wherein the color registration error model is a parametric model having one or more parameters. An image plane correction value is determined based on the predicted color registration error, and the document is printed using the determined image plane correction value.

Abstract: A method for moving print media includes providing a vacuum assembly having an arcuate profile to deflect the print media such that the print media has a non-linear profile in a direction perpendicular to a media travel path. A roller, having an axis of rotation and a diameter, and including three sections with the second section located between the first and third section as viewed along the rotational axis is provided. The diameter of the roller in the first and third sections is greater than in the second section. The roller is used to deflect the web of print media in a direction opposite to that of the deflection of the web of print media by the vacuum assembly, thereby spreading the web of print media in a cross-track direction to reduce the formation of wrinkles in the web of print media as it travels over the roller.

Abstract: A method for correcting color registration errors for a color printer that prints color image data on a continuous web of media. A color registration error model is used to predict a color registration error value for a particular in-track position as a function of ink coverage characteristics for an image region including the particular in-track position, wherein the color registration error model is a parametric model having one or more parameters. An image plane correction value is determined based on the predicted color registration error, and the color image data for the particular in-track position is printed using the determined image data correction values.

Abstract: A printing system for printing on a print medium is disclosed. A first linehead is disposed opposite a first side of the print medium. The first linehead defines print zones where a liquid is deposited onto the first side of the print medium. A plurality of transport rollers are disposed adjacent to the second side of the print medium. At least one transport roller is aligned with one of the one or more print zones of the first linehead. A vacuum manifold is disposed opposite the second side of the print medium. The vacuum manifold is aligned with the aligned transport roller and outputs a vacuum force that operates on the second side of the print medium to deflect the print medium causing an increase in the wrap angle of the print medium around the aligned transport roller.

Abstract: A method for moving print media includes providing a transport member having an operative surface to deflect the print media such that the print media has a non-linear profile in a direction perpendicular to a media travel path. A roller, having an axis of rotation and a diameter, and including three sections with the second section located between the first and third section as viewed along the rotational axis is provided. The diameter of the roller in the first and third sections is greater than in the second section. The roller is used to deflect the web of print media in a direction opposite to that of the deflection of the web of print media by the transport member, thereby spreading the web of print media in a cross-track direction to reduce the formation of wrinkles in the web of print media as it travels over the roller.

Abstract: A method for printing on a moving print medium in a printing system is disclosed. The method includes providing a linehead defining one or more print zones. A plurality of transport rollers are provided, wherein at least one transport roller is disposed opposite the linehead, adjacent to the second side of the print medium, and aligned with one of the print zones. A vacuum assembly is disposed opposite the second side of the print medium and includes a vacuum manifold aligned with the aligned transport roller. The print medium is moved through the printing system and a vacuum force operates on the print medium such that at least a portion of the print medium is deflected thereby increasing a wrap angle of the moving print medium around the aligned transport roller. Liquid is jetted from the linehead onto the print medium to form a print.