A method for calibrating a printing system including a plurality of printers includes designating one of the plurality of printers as a reference printer and defining color values for a desired response for one or more printed test patches on a control page. Through a first process aimed toward achieving the desired response, a printed control page is generated with the reference printer, the control page including one or more of the test patches which, when measured, has a measured response which approaches the desired response. Through a second process aimed toward achieving a desired response, the desired response being the measured response of the reference printer, a printed control page is generated with a second of the printers, the control page including one or more of the test patches which, when measured, has a response which approaches the measured response of the reference printer.

Gray balance for a printing system of multiple marking engines

A method and system for color calibration or color output device spectrophotoically measures at test target including a preselected test color value. A multi-dimensional LUT of the device is generated representative of the color information including the at least one preselected color. Producing a second image width device including the at least one preselected color located at a plurality of spatial locations in the second image. A second sensor measures the second image and a plurality of spatial locations having the preselected color for generating reflectance information for the preselected color at the plurality of spatial locations. An error is determined between the measured color of the one preselected color and the reflectance information at the other pixel locations. A multi-dimensional LUT is adjusted to minimize spatial uniformity errors at the other pixel locations, thus calibrating device color output spatially.

Method for spatial color calibration using hybrid sensing systems

A method includes forming a plurality of test patches in an array of orthogonal rows. The test patches are formed by using at least one printhead in an imaging machine. Each of the test patches is associated with a respective one of a plurality of initial input color values. The array of test patches includes a plurality of rows of varied-input test patches and at least one row of first equivalent-input test patches. A respective output color value of each of the test patches is measured. At least one first mathematical relationship is generated based on the output color values of the at least one row of first equivalent-input test patches. A plurality of adjusted input color values are calculated for respective ones of the varied-input test patches. Each adjusted input color value is calculated based upon the generated at least one first mathematical relationship. A second mathematical relationship is computed between the adjusted input color values and the output color values. The imaging machine is calibrated by using the second mathematical relationship.

Calibration method for an imaging device

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.

Color characterization or calibration targets with noise-dependent patch size or number

A method for estimating color measurements of color samples includes printing a color sample based on input data, measuring a color of the printed color sample with an in-line spectral sensor at a first temperature, and estimating a color of the printed color sample which would be output by a reference spectral sensor at a second temperature. The estimation is based on a thermochromatic model which represents relationships between measured colors of printed color samples on the in-line spectral sensor at the first temperature and the reference spectral sensor at the second temperature. The reference spectral sensor is a different type of sensor from the in-line spectral sensor, so the color response of the two spectral sensors is different, even when the measurement conditions are identical. Consequently, a set of printed spot color samples generate different measured colors at the second temperature on the in-line spectral sensor from the reference spectral sensor. The exemplary method allows these differences, as well as measurement temperature differences to be accounted for in the estimation.

Method to minimize instrument differences in color management functions

A system and method for printer control and color balance calibration. The system and method address the image quality problems of print engine instability, low quality of color balance and contouring from the calibration. The method includes defining combinations of colorants, such as inks or toners that will be used to print images, defining a desired response for the combinations that are to be used and, in real time, iteratively printing CMY halftone color patches, measuring the printed patches via an in situ sensor and iteratively performing color-balance calibration based on the measurements, accumulating corrections until the measurements are within a predetermined proximity of the desired response. The calibration is performed on the halftones while they are in a high quantization resolution form.

Iterative printer control and color balancing system and method using a high quantization resolution halftone array to achieve improved image quality with reduced processing overhead

A color output device is generally driven by at least three independent control signals for control of its response. A desired response in device independent color space is normally obtained by employing a cascade consisting of a characterization transform and calibration transform. The calibration transform transforms input control variables into output control variables that are directly used to drive the device. Input control variables can be transformed into intermediate control variables, which can be then mapped to output control variables utilizing a two-dimensional transformation. The two-dimensional calibration architecture provides improved control functionality and flexibility.

Two-dimensional calibration architectures for color devices

There is disclosed a printing system for processing an electronic document with an original stream having at least two printing related instructions. Responsive to reading the at least two printing related instructions with a controller; the original stream is split into two or more streams. A printer produces (1) one or more sets of prints from one or more of the two or more streams for storage in one or more inserters, and (2) a final set of prints from another one of the two or more streams, the final set of prints corresponding to a hardcopy stream with at least one gap. The one or more sets of prints are automatically stored in the one or more inserters and, pursuant to printing the final set of prints; the one or more inserters are used to insert at least one print from the one or more sets of prints into the at least one gap of the hardcopy stream.

System and method for reducing print delays for print jobs

Color balancing system and method using a high quantization resolution halftone array

A method of scheduling a print job may include determining a first set of deployments that includes one or more deployments. Each deployment in the first set may include an indication of a logical device in a cloud environment and an indication of a production center. The method may include for one or more deployments in the first set of deployments, determining a total compliance value associated with the deployment, identifying a subset of deployments based on, at least in part, the associated total compliance values, generating a new set of deployments based on, at least in part, the identified subset of deployments, and in response to the first set of deployments being an improvement over the new set of deployments, incrementing a count variable, and repeating the determining a total compliance value, identifying, and generating operations until the count variable equals an exit condition value.

Jean-Pierre R. N. Van de Capelle

Papers

Iterative printer control and color balancing system and method using a high quantization resolution halftone array to achieve improved image quality with reduced processing overhead

Two-dimensional calibration architectures for color devices

System and method for reducing print delays for print jobs

Color balancing system and method using a high quantization resolution halftone array

System and method for dynamic redeployment of cloud-based services