SYSTEM FOR DISTRIBUTING AND CONTROLLING COLOR REPRODUCTION AT MULTIPLE SITES
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Abstract
The system provides for controlling color reproduction of input color image data in a network having nodes (or sites). The system distributes the input color image data from one of the nodes to other nodes, and provides data structures in the network. The system has means for providing color calibration data at each node characterizing output colors (colorants) of the rendering device of the node, and means for producing at each node, responsive to the color calibration data of the rendering device of the node, information for transforming the input color image data into output color image data at the rendering device of the node. The rendering device of each node renders a color reproduction responsive to the output color image data, wherein colors displayed in the reproduction at the rendering device of each node appear substantially the same within the output colors attainable by the rendering devices.
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75 Claims
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1-54. -54. (canceled)
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55. A system for controlling color reproduction comprising:
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a plurality of rendering devices; a plurality of computers wherein each of said computers is coupled to at least one of said rendering devices and said computers communicate through network interfaces employing one or more network protocols; and memory for storing data and programs, wherein said data comprise color image data and one or more files having a header enabling access to information for transforming said color image data for rendering on at least one of said rendering devices, said information comprising one or more data structures expressing the relationship between at least two color gamuts and wherein said programs comprise at least one of image retouching software or a page layout program, a program for associating annotations with said image data and one or more programs for rendering said color image data, responsive to said information, for improved color matching in accordance with a criterion for color reproduction based at least partly upon said relationship between color gamuts. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. An apparatus for controlling color reproduction with improved color matching at multiple rendering devices comprising:
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a computer system operating as a server which is one of a plurality of sites that communicate through network interfaces using one or more network protocols; and memory which stores information for transforming color image data for rendering devices at said sites, wherein said information for transforming comprises at least gamut filters for said rendering devices, said information for transforming is modifiable responsive to user preferences for color reproduction, and said information for transforming is communicated through one or more files having a header and wherein a gamut filter is a three-dimensional array whose inputs are color values and whose outputs indicate whether color values of said inputs are either inside or outside of a color gamut, said gamut filter being accessible through said file header. - View Dependent Claims (66, 67, 68, 69, 70)
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71. A method of color reproduction comprising the steps of:
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connecting two or more programmable computers in a network for communication using Internet Protocol, wherein at least two of said two or more programmable computers are linked to color rendering devices; providing data for storage in memory associated with said network, said data comprising; graphical menu elements used by one or more of said two or more programmable computers to provide a user interface on a display enabling a user to initiate execution of programs for receiving color measurements and verifying the accuracy of transforming input colors in device independent units for rendering on one or more of said color rendering devices by comparing measured colors to reference colors with respect to an error criterion; at least one file comprising a header, said header providing access to a plurality of data structures within said file, said data structures holding information related to color transformation, wherein at least one of said data structures is a three-dimensional array whose inputs are device-independent color values and each of whose outputs indicate whether the corresponding input color is inside or outside of a color gamut, wherein said file is communicable between nodes of said network; and tonal transfer functions expressing the relationship between digital command codes and rendered density values for each of the color channels of a color rendering device responsive to measurements and to user preferences expressed through said user interface; and directing execution of one or more programs by one or more of said two or more programmable computers, said one or more programs comprising; software for retouching color images or designing page layouts; a program that receives measurement data representative of rendered output of a color rendering device and accumulates a record of color reproduction performance of said color rendering device over time; a program that uses said measurement data for comparing measured colors to reference colors to produce color error data; and a program for modifying the conversion of colors for rendering responsive to said color error data. - View Dependent Claims (72, 73, 74, 75)
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Specification