Abstract:
A printing system for printing images, and including a system to reduce marking material coverage, while maintaining color fidelity, includes an image input, where the image defines an amount of marking material to be deposited on an printed reproduction, a marking material coverage calculator, determining expected original marking material coverage for a given area of a received image; and a marking material reduction controller, using the expected marking material determination to control coverage reduced reproduction of the given area in accordance with a non-linear coverage reduction function.
Abstract:
In a "hi-fi" color printing system, wherein colorants of hi-fi colors beyond the regular CMYK primary colorants are available, a main gamut obtainable with the CMYK colorants only is mutually exclusive with at least one extended gamut in which a hi-fi colorant is used and a complementary one of the CMY colorants is excluded. Because the main and extended gamuts are mutually exclusive, no more than four colorants are used in any part of the image, and no more than four halftone screens need be used to obtain any desired color.
Abstract:
A method is provided for at least partially superposing an edge of a first object with the edge of a second object in a system for displaying at least the first and second objects against a background. The objects and the background are defined by a plurality of pixels and each pixel possesses a selected one of at least a first output state and a second output state. The method includes the steps of: setting a first set of dispersed pixels disposed along the edge of the first object to the second output state; setting a second set of dispersed pixels disposed along the edge of the second graphic object to the second output state; and superposing the edge of the first object with the edge of the second object so that the first set of pixels is intermeshed with the second set of pixels to form a partial pixel boundary between the first object and the second boundary.
Abstract:
Disclosed are methods and apparatus for operating a page parallel RIP printing system including a plurality of image marking engines (IMEs). According to an exemplary method, a print job is split into a plurality of job chunks, each job chunk grouped by its destination IME; and the job chunks are processed into a printer ready format by a plurality of RIP nodes associated with the job chunk group's respective destination IME.
Abstract:
For a selected class of functions, which describe most typical banding variations, the average response can be found by sampling at only 2Nth locations, where N is the number of different frequencies of significant banding. This approach makes use of the fact that in most applications the banding frequencies of a given printer system, are known in advance, even if the amplitudes of the banding are not known. Each sample point requires a very small test area or pattern, significantly reducing the overall size of the required test areas.
Abstract:
Color separation systems and methods improve color constancy and smoothness of a color lookup table (LUT) for a printer. A plurality of nodes of the LUT may be defined in colorimetric space, and the nodes out of the printer gamut may be mapped to the printer gamut surface. All possible colorant combinations are then determined that produce each node in the LUT in a device independent color space based on an inversion of the spectral based printer model. Next, a specific image quality metric combination based on a color inconstancy index (CII) and a gray component replacement (CGR) strategy is defined. And a colorant combination is determined for each and every node in the LUT based on this metric. A smoothing filter may be used to smooth the lookup table.
Abstract:
A parallel Raster Image Processor system that includes a plurality of Raster Image Processors (RIPs) for parallel processing of a print job into a printer-ready format for the printing of the print job and a splitter for splitting the print job into a plurality of chunks and sending the chunks of the job to the plurality of the RIPs for processing. The print job includes objects described in a page description language. The splitter is configured to: interpret the job to determine the objects required by each of the plurality of the RIPs to process corresponding received chunks; store the determined objects to maintain knowledge of the determined objects; and send the determined objects along with the corresponding chunks to the designated RIPs to process the corresponding chunks, if the same determined objects are not already with the designated RIPs.
Abstract:
What is disclosed is a novel fault tolerant page parallel RIP system having a plurality of distributed RIP nodes and a method for robust recovery in the event of a fault having occurred on the system. In one embodiment, the present fault tolerant page parallel RIP system comprises at least a plurality of RIP nodes, a supervisor node, and a splitter node. The splitter receives a location of the job file and splits the job file into at least one original chunk. In formation sufficient to regenerate the original chunk in the event of a fault condition having occurred on the page parallel RIP system is stored. The splitter then sends the original chunk to a destination RIP node wherein the original chunk is RIP'ed into at least one page in print-ready form. The one page is the provided in print-ready form to an output subsystem. Various embodiments are disclosed.
Abstract:
Color separation systems and methods improve color constancy and smoothness of a color lookup table (LUT) for a printer. A plurality of nodes of the LUT may be defined in colorimetric space, and the nodes out of the printer gamut may be mapped to the printer gamut surface. A set of possible colorant combinations are then determined that produce each node in the LUT in a device independent color space using a non-linear minimization algorithm, such as, for example, a conjugate gradient algorithm. Next, a colorant combination may be determined for each and every node in the LUT based on an image quality metric. In some implementations, a smoothing filter may be used to smooth the lookup table.
Abstract:
A calibration or characterization system is provided wherein the number of repeated patches or the size of a patch of a given color is printed to be approximately proportional to the square of the expected noise level. In that way, when multiple measurements for a given patch are averaged, all patch averages have approximately the same reliability.