Eastman-kodak Company

Robert F Poe

H Scott Gregory, Jr

Michael S Schwartz

Douglas G Walker

Gary H Newman

Christopher J Enscoe

Anne C Rourke

King F Choi

George B Pawle

Everett A Johnston

A system is described that uses [device&#x3e;PCS] transformations for a source and destination device along with user preference information to create a composite [device&#x3e;device] transformation which is used to convert a color in a source space from a source device into a color in a destination space provided to a destination device. The user preference information can be a default or extracted from an image or from the profiles involved or from a GUI. The system modifies the domain of the [device&#x3e;PCS] transform from a destination device profile through the use of an ink manifold such that there are three input dimensions. The inking manifold can be an identity transform. The system also modifies the range of the [device&#x3e;PCS] transform from a source device profile such that the PCS coordinates are all within the range of the modified [device&#x3e;PCS] transform. The modified destination transform is inverted for values in the source transform domain to produce the [device&#x3e;device] transform. The range of the [device&#x3e;device] transform can be modified by applying the inking manifold transform to yield coordinates in the range of the destination device.

System for combining device color profiles

A system is disclosed that extends a high order polynomial model of an input device into a device region where measured input data is not available by selecting points in an unmeasured region, determining a slope at each of the selected points using a lower order model, and fitting the higher order model to the measured values and the slope values.

System for modeling a color imaging device

A system is disclosed that uses input and output color space identifiers and other information about the transforms to automatically determine a size and a class of identity function composite tabular function. The identity function is constructed. The identity function is composed with input and output composite tabular functions to form a net composite tabular function. The identity function is selected based on the characteristics of the input and output spaces, color space, and transform shape. The size of the identity function is determined by the maximum size of the color space functions and the interval spacing that needs to be maintained for the net function.

System for composing color transforms using class information

This is a method for adjusting output device profiles for four-color devices such as offset presses. The user of this invention starts by selecting a base profile. This base profile produces satisfactory color but does not have the desired amount of Gray Component Replacement (GCR). The user of this invention makes use of this invention to adjust the GCR of the output profile until it is at some desired level. The invention then produces a new output profile which produces the same color as the base profile but which has the desired degree of GCR.

Computer program product for modifying the black channel of an output

A computer product for controlling a color-reproduction process employing N colorants, where N is greater than 3, the computer program product comprises: a computer readable storage medium having a computer program stored thereon for performing the steps of: defining a first transformation from a N-dimensional colorant-signal space associated with the color-reproduction process to a 3-dimensional colorimetric space such that each combination of N colorant signals is mapped to a visual color that would be produced by the process in response to that combination of signals; defining a second transformation for mapping from a 3-dimensional parameter space into the N-dimensional colorant-signal space for defining a particular 3-dimensional subspace of the N dimensional colorant-signal space for ultimately restricting the permitted combinations of the N colorant signals; combining the first and second transformations for defining a third transformation for transforming data directly from the 3-dimensional parameter space to the 3-dimensional calorimetric space; finding the mathematical inverse of the third transformation for defining an inverse transformation which transforms data from the 3-dimensional calorimetric color space to the 3-dimensional parameter space.

Multicolorant process control

The output response of an image processing system having a color printer and a color printer characterization is linearized by printing a target image having target patches of differing color densities. After measuring printed patches, a calibration transform is generated that incorporates the relationship between requested and measured color densities. The calibration transform is then composed with the characterization, calibrating the printer characterization.

Characterization calibration

A method and apparatus for generating a modified electronic image combines multiple image transforms into a single composite transform, and then modifies the electronic image in accordance with the composite transform. The composite transform includes sample values sequentially modified in accordance with each of the multiple image transforms being combined. The method and apparatus further provides a user interface allowing a user to select individual transforms for composition. The use of a composite transforms allows a user to interact with the image processing system more quickly and interactively while obtaining a desired modified image.

Color image processing system for preparing a composite image

A method for communicating a transform definition to a destination device. The transform definition outputs image parameter data based on input image data and has a channel corresponding to each output image parameter. Each channel has at least one input table, an output table and a grid table representing an input/output relation of an image transformation. The destination device is provided with: identification data identifying the communication as that of a transform definition; version data for distinguishing the transform definition from other versions of the transform definition; size data specifying a size of one of the grid table's dimensions for each channel's grid table; with input table, output table, and grid table data of any input, output, and grid table which is shared by a plurality of channels; and with input table, output table and grid table data of any private input, output, and grid tables.

Method and apparatus for storing and communicating a transform

A technique for stabilization and calibration of precision analog circuit components such as amplifiers. A sample and hold circuit is placed in the feedback loop of the component. The input of the component is periodically coupled to reference voltage while the sample and hold circuit is set to a sample mode. Any offset voltage at the output of the component is then fed, through the sample and hold circuit, back to a summing node formed at the input, and thus automatically canceled. This sequence is periodically repeated at convenient times, to keep the sample and hold circuit properly charged, and to compensate for changes in operating conditions over time. The transfer function of the component can be determined by a circuit which periodically measures its response to a series of known input voltages. The exact value of the voltage input to the component is known, since any offset is automatically canceled by the operation of the sample and hold circuit. After the response of the component to a number of inputs is measured in this way, its transfer function is determined using a method such as LaGrangian interpolation. During normal operation of the component on the analog input signal, the computer then converts measured outputs to the interpolated values.

Growing community of inventors

Charlestown, MA, United States of America

Robert F Poe