Eastman-kodak Company

Douglas G Walker

H Scott Gregory, Jr

Robert F Poe

George B Pawle

King F Choi

Timothy K Rodgers

Christopher M Heinz

Richard C Close

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 that stores a color management transform, typically using a grid table, where one or more of the input channels represents parameters used to control the reproduction of the conventional color image channels. The invention augments the existing grid-table based transform structure with additional channels to control the operation of the color models involved. These additional channels are not the conventional calorimetric or colorant image channels such as red, green, and blue, but are to control other aspects of the color transformation, such as exposure level or saturation. The augmentation also includes identification information that identifies the type of control (exposure, grey component replacement, etc.) the extra channels provide.

Color management system incorporating parameter control channels

The invention involves selecting a path through a multi-dimensional hyper-cube from a base vertex to an opposite corner or vertex of the hyper-cube. The path is selected by ranking the fractional components of the point or value to be interpolated. An N-dimensional interpolation is performed according to this sequence. During an interpolation a base vertex for an input color value is determined. The output value for the base vertex is accumulated. The fractional values of the input color value are sorted and ranked according to magnitude to produce an interpolation sequence. The interpolations are performed for each axis of the N-dimensions by selecting an axis for interpolation based on the order, performing an interpolation corresponding to the selected axis producing an interpolation result, and accumulating the interpolation result.

Method and apparatus for multi-dimensional interpolation

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

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 system that combines a reference color image with a color move tracer image creating a combined image capable of being edited as desired by the operator and one which records the actual color edits made on the reference image. The tracer is a color grid that represents the domain of colors in a specified color space encoding. The grid is converted into a color edit transform table and the color edits within the color space on a higher resolution version of the reference image, or on other images, can be performed using a table look-up operation. The invention can also be used to capture effects transforms that modify the input/output and/or screen display of an image without necessarily modifying the original image.

Method and apparatus for performing color transformations using a

An arrangement for producing electrophotographic reproductions of an original image, including a source of digitized data that digitally represents an original image, a photocopier having determinable reproduction characteristics and which produces electrophotographic reproductions, and a printer. The printer is coupled to the source that receives the digitized data and produces an optical intermediate from the digitized data. This optical intermediate compensates for the determinable reproduction characteristics of the photocopier and of the scanner such that photocopying of the optical intermediate by the photocopier produces an accurate electrophotographic reproduction of the original image. The printer is provided with a composite device function table that relates target image pixel values used by the printer to measured color data of the output of the photocopier.

Growing community of inventors

Boston, MA, United States of America

Douglas G Walker