Abstract: A light source adjustment apparatus is disclosed. The light source adjustment apparatus includes processing apparatus to receive a scanned image of a pattern printed by a print apparatus onto a printable medium, the pattern including a plurality of blocks of print agent of a first colour printed during a printing operation in which light sources of a light source array irradiate a photoconductive surface; analyse the scanned image to identify a region of non-uniformity within the plurality of blocks of print agent; correlate a location of the identified region of non-uniformity with a corresponding light source in the light source array; determine, based on the identified region of non-uniformity, an adjustment to be made to a parameter of the corresponding light source; and generate a signal to effect the determined parameter adjustment with regard to the corresponding light source. A method and a print apparatus are also disclosed.

Abstract: A light source adjustment apparatus is disclosed. The light source adjustment apparatus includes processing apparatus to receive a scanned image of a pattern printed by a print apparatus onto a printable medium, the pattern including a plurality of blocks of print agent of a first colour printed during a printing operation in which light sources of a light source array irradiate a photoconductive surface; analyse the scanned image to identify a region of non-uniformity within the plurality of blocks of print agent; correlate a location of the identified region of non-uniformity with a corresponding light source in the light source array; determine, based on the identified region of non-uniformity, an adjustment to be made to a parameter of the corresponding light source; and generate a signal to effect the determined parameter adjustment with regard to the corresponding light source. A method and a print apparatus are also disclosed.

Abstract: In one example, a calibration of a print engine may include producing an image by scanning imaging elements along a scan direction, the image having a calibration portion that is continuous or unbroken in a direction perpendicular to the scan direction. Information indicative of an optical measurement of the calibration portion is received. A contribution to the optical measurement associated with each of the laser elements in the group of laser elements is determined. A calibration adjustment for the laser elements in the group of laser elements is determined.

Abstract: A method for determining a printing position, such as for image-on-paper registration in a printer or photocopying machine, is disclosed. A fiducial mark pattern comprising a plurality of fiducial marks at predefined relative distances is provided on a printing medium, and is scanned. The fiducial marks and a first edge of the printing medium are identified in a scanned representation of the printing medium. A first distance between the first edge and a first fiducial mark is determined, and a second distance between a second fiducial mark and a third fiducial mark are likewise determined from the scanned representation of the printing medium. The distance between the fiducial mark pattern and the first edge is computed based on both the determined first distance and the determined second distance. The invention also relates to a corresponding system and a computer-readable medium for determining a printing position.

Abstract: A method for determining a printing position, such as for image-on-paper registration in a printer or photocopying machine, is disclosed. A fiducial mark pattern comprising a plurality of fiducial marks at predefined relative distances is provided on a printing medium, and is scanned. The fiducial marks and a first edge of the printing medium are identified in a scanned representation of the printing medium. A first distance between the first edge and a first fiducial mark is determined, and a second distance between a second fiducial mark and a third fiducial mark are likewise determined from the scanned representation of the printing medium. The distance between the fiducial mark pattern and the first edge is computed based on both the determined first distance and the determined second distance. The invention also relates to a corresponding system and a computer-readable medium for determining a printing position.

Abstract: A method for determining a printing position, such as for image-on-paper registration in a printer or photocopying machine, is disclosed. A fiducial mark pattern comprising a plurality of fiducial marks at predefined relative distances is provided on a printing medium, and is scanned. The fiducial marks and a first edge of the printing medium are identified in a scanned representation of the printing medium. A first distance between the first edge and a first fiducial mark is determined, and a second distance between a second fiducial mark and a third fiducial mark are likewise determined from the scanned representation of the printing medium. The distance between the fiducial mark pattern and the first edge is computed based on both the determined first distance and the determined second distance. The invention also relates to a corresponding system and a computer-readable medium for determining a printing position.

Abstract: A method for determining a printing position, such as for image-on-paper registration in a printer or photocopying machine, is disclosed. A fiducial mark pattern comprising a plurality of fiducial marks at predefined relative distances is provided on a printing medium, and is scanned. The fiducial marks and a first edge of the printing medium are identified in a scanned representation of the printing medium. A first distance between the first edge and a first fiducial mark is determined, and a second distance between a second fiducial mark and a third fiducial mark are likewise determined from the scanned representation of the printing medium. The distance between the fiducial mark pattern and the first edge is computed based on both the determined first distance and the determined second distance. The invention also relates to a corresponding system and a computer-readable medium for determining a printing position.

Abstract: A color plane registration error method and system include printing a plurality of predetermined patterns of dots, each predetermined pattern having the respective dots arranged symmetrically around a common center of gravity. The center of gravity of each of the printed patterns and the distances between centers of gravity of respective patterns are determined to measure the color plane registration error.

Abstract: Automated inspection method for detecting a defect in a printed image, comprising processing a raster image, sending the raster image to a print process, printing a printed image corresponding to the raster image onto a medium, capturing a target image from at least a part of the printed image at a lower resolution than the printed image, at least in a medium moving direction, converting at least a part of the raster image to a reference image, and comparing the reference image to the target image.

Abstract: A method for designing a screen includes receiving screen information related to a picture element divided into a number of subunits of the picture element, and determining an amount of an ink to apply to a media at a location of the picture element in response to the information. The subunits of the picture element have a higher resolution than the resolution of a printing apparatus at which the printing element will be reproduced.

Abstract: Automated inspection method for detecting a defect in a printed image, comprising processing a raster image, sending the raster image to a print process, printing a printed image corresponding to the raster image onto a medium, capturing a target image from at least a part of the printed image at a lower resolution than the printed image, at least in a medium moving direction, converting at least a part of the raster image to a reference image, and comparing the reference image to the target image.

Abstract: A color plane registration error method and system include printing a plurality of predetermined patterns of dots, each predetermined pattern having the respective dots arranged symmetrically around a common center of gravity. The center of gravity of each of the printed patterns and the distances between centers of gravity of respective patterns are determined to measure the color plane registration error.

Abstract: One embodiment of a color filter includes a substrate and a color filter pattern formed on the substrate, the color filter pattern including at least two, substantially identical patterned layers.

Abstract: A system and method for page composition in a processor-controlled printing system. Formatted image data is first received to a processor, the data representing image elements to be merged into a new document. At least one compressed cell describing each of the page elements is generated based on the formatted image data. A compressed cell contains pixilated image data of a predetermined pixel size. An element table including at least one cell pointer for each page element is generated. Each cell pointer includes a memory location and a cell type for each compressed cell that is pointed to by the generated element table. A merged page is composed based on the cell type entries of the element tables. A page composition system and a computer readable media having computer instructions for implementing the method of page composition are also provided.

Abstract: A portable document format (PDF) file includes a graphical object and a corresponding spot color space. The spot color space is represented by at least one spot color name and an alternate representation of the spot color with device-independent data.

Abstract: A method, program product and system for generating a production ready document in a commercial printing environment including a designer location and a print service provider location, where the method comprises creating a file at the designer location using updated device configuration information from the print service provider location, selecting a document profile for the file from a plurality of document profiles available at the print service provider location, applying the selected document profile to the file and adjusting characteristics of the file, if necessary, to ensure that the file is a production ready document, submitting the production ready document to the print service provider location via an electronic network, and performing at least one of automated printing, finishing, packaging and shipping using the production ready document.

Abstract: A system and method are provided for calibrating a beam array of a printer. The method includes the operation of printing a dot pattern using the beam array of the printer. The dot pattern can then be scanned into an electronic file using an optical scanner. Another operation is calculating distance calibration errors found in the dot pattern in the electronic file using a software module applied to the electronic file.

Abstract: An integrated workflow for commercial printing with a closed-loop communication link between designer and print service provider locations. The present invention provides a method, program product and system for managing workflow in a commercial printing environment including a designer location and a print service provider location, where the method comprises establishing a closed-loop communication link between the designer location and the print service provider location, creating a press ready file at the designer location using updated device configuration information received from the print service provider location via said closed-loop communication link, submitting the press ready file to the print service provider location via the closed-loop communication link, and performing at least one of automated printing, finishing, packaging and shipping using the press ready file.

Abstract: One single-stage proofer RIP replaces a conventional setup of two proofer RIP stages in series. Preliminary profile and data processing usually performed at the first of the conventional RIP stages, and source input terminal of the second, are instead performed in a preprocessor at the image-originating or production-hardcopy-printer station. The preprocessor combines production-printer forward and inverse profiles with a profile for the monitor, associated computer or graphics program—to form a single profile that converts monitor signals to perceptual data representing appearance of the predicted production copy. This three-way composite profile is applied to the source terminal of the single-stage proofer RIP.

Abstract: A method for adjusting a laser diode drive current pulse, comprises providing a power correction table comprising drive current pulse correction factors corresponding to counter positions. The method also comprises providing a jump table comprising counter position adjustments corresponding to correction factors. A count value of a position within the counter positions is maintained. Maintaining the count value comprises indexing the count value to the jump table and incrementing the count value for each of a series of pixel clocks. A correction factor is determined, wherein determining the current correction factor comprises indexing the count value to the power correction table.