System for distributing and controlling color reproduction at multiple sites

• US 7,729,008 B2
• Filed: 06/14/2006
• Issued: 06/01/2010
• Est. Priority Date: 02/26/1996
• Status: Expired due to Fees

• Current Assignee: RAH Color Technologies LLC
• Original Assignee: RAH Color Technologies LLC
• Inventors: Holub, Richard A.
• Primary Examiner(s): Coles; Edward L
• Assistant Examiner(s): Brinich; Stephen M
• Application Number:
  US11/452,869
• Publication Number:
  US 20060232805A1
• Time in Patent Office: 1,448 Days
• Field of Search: 358/1.9, 358/2.1, 358/500, 358/504, 358513-520, 358/530
• US Class Current: 358/1.9
• CPC Class Codes: G01J 3/462 Computing operations in or between colour spaces; Colour management systems
• CPC Class Codes: G01J 3/465 taking into account the colour perception of the eye; using tristimulus detection
• CPC Class Codes: G01J 3/50 using electric radiation detectors
• CPC Class Codes: G01J 3/524 Calibration of colorimeters
• CPC Class Codes: G06F 3/04897 Special input arrangements or commands for improving display capability
• CPC Class Codes: G06F 3/1203 Improving or facilitating administration, e.g. print management
• CPC Class Codes: G06F 3/1267 Job repository, e.g. non-scheduled jobs, delay printing
• CPC Class Codes: H04N 1/32523 a plurality of output devices
• CPC Class Codes: H04N 1/32545 Distributing a job or task among a plurality of input devices or a plurality of output devices
• CPC Class Codes: H04N 1/46 Colour picture communication systems
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 1/6052 Matching two or more picture signal generators or two or more picture reproducers
• CPC Class Codes: H04N 1/6058 Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut
• CPC Class Codes: H04N 1/6066 dependent on the gamut of the image to be reproduced
• CPC Class Codes: H04N 17/02 for colour television signals

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.

Claims

1. A color rendering system comprising to improve color matching in relation to at least one other color device comprising:

a computer system which communicates with at least one computer through a network interface;

a color output device which communicates with said computer system;

a display linked to said computer system, said computer system providing a user interface for displaying menu selections to a user;

a user input device operable in combination with said display and said computer system for enabling said user to choose among said menu selections expressing at least user preferences for color reproduction and to make annotations on said display for association with color image data; and

memory for storing tonal transfer curves for the color channels of said color output device, one or more color transformations for converting a first set of color coordinates into a second set of coordinates for said output device, said color image data, and said annotations to said color image data, wherein said tonal transfer curves and said one or more color transformations are at least partly in accordance with calibration data in device-independent units of color and are useable in combination to control rendering by said color output device.

2. The system according to claim 1 wherein said tonal transfer curves are specific to said color output device.

3. The system according to claim 1 further comprising a color measuring instrument useable for calibrating said tonal transfer curves.

4. The system according to claim 1 wherein said improved color matching comprises a criterion for reproduction shareable with said at least one computer, said criterion comprising at least information about the gamuts of said color output device and at least one other color device.

5. The system according to claim 1 wherein said annotations are useable for interactive conferencing with said at least one computer.

6. The system according to claim 1 wherein said memory further stores a data structure expressing the portions of said color image data that are outside the color gamut of the color output device in which said data structure has inputs which are color values and outputs which indicate whether input values are either in or out of gamut for the color output device.

7. The system according to claim 1 wherein the color output device is one of a press or a printer having a plurality of colorant channels numbering greater than four, in which at least one of said one or more color transformations is useable for transforming said first set of color coordinates into said second set of coordinates corresponding to said plurality of colorant channels.

8. The system according to claim 1 wherein said one or more color transformations comprise a sequence of color conversions wherein at least one of said conversions enables chromatic adaptation useable to compensate for change in viewing conditions when needed.

9. The system according to claim 1 wherein said one or more color transformations comprise a colorant to colorant transformation which enables proofing or simulation of one output device by another.

10. The system according to claim 1 wherein said user interface enables a user to view a representation of computers linked through said network interface.

11. The system according to claim 3 wherein said color measuring instrument is incorporated into said color output device.

12. A color rendering system comprising:

a computer system having a network interface for communication over a network;

a display coupled to said computer system, said computer system providing a user interface for displaying a menu of selections to a user;

a user input device operable in combination with said display and said computer system for enabling said user to choose among said menu of selections expressing at least user preferences for color reproduction and to make annotations on said display for association with color image data; and

memory for storing at least tonal transfer curves for a plurality of color channels, said color image data, said annotations to said color image data and one or more color transformations for converting a first set of color coordinates into a second set of coordinates, wherein said tonal transfer curves and said one or more color transformations are at least partly in accordance with calibration data in device-independent units of color and are useable in combination to control rendering of said color image data.

13. The system according to claim 12 wherein said one or more color transformations comprise a chromatic adaptation transform useable when needed to accommodate change in viewing conditions.

14. The system according to claim 12 wherein said memory further stores gamut data, and said gamut data represents the gamut of at least one of one or more color devices, said color image data, a medium for rendering a reproduction, or a photographic scene.

15. The system according to claim 12 wherein said memory further stores a criterion for reproduction shareable with one or more computers via said network interface.

16. The system according to claim 12 wherein said memory further stores a data structure having inputs which are color values and outputs which indicate whether input values are either in or out of gamut for the color output device, said data structure being useable in displaying portions of said color image data which are outside the gamut of the color output device.

17. The system according to claim 12 wherein said user interface enables said user to select a sequence of operations upon said color image data, and said sequence comprises at least in part said one or more color transformations.

18. The system according to claim 15 further comprising a color rendering device, wherein said color rendering device is connected directly to said computer system or is accessible by said computer system over said network.

19. The system according to claim 18 wherein said criterion for reproduction comprises gamut data of said color rendering device.

20. The system according to claim 19 wherein said gamut data is represented in a two-dimensional array in which limiting chroma values are stored for hue and lightness coordinates.

21. The system according to claim 12 wherein said memory further stores a colorant to colorant transform which enables proofing or simulation of one output device by another.

22. The system according to claim 12 wherein said memory further stores gamut data, and said gamut data represents the gamut of at least one of one or more color devices, said color image data, a medium for rendering a reproduction, or a photographic scene.

23. The system according to claim 12 wherein said user interface enables specification of one or more of GCR, UCR or maximum black.

24. The system according to claim 23 wherein said user interface further enables specification of a neutral definition in terms of mixtures of colorants and displays said neutral definition graphically on said display.

25. The system according to claim 12 wherein said user interface enables a user to view on said display a representation of computers linked through said network interface.

26. The system according to claim 12 wherein said annotations are shareable with one or more other computer systems through said network interface.

27. The system according to claim 26 wherein said annotations are communicated as part of an interactive conference with one or more users at said one or more other computer systems.

28. A method for color rendering using a computer system having a display coupled to said computer system, said method comprising the steps of:

displaying on the display a menu of selections which enable a user to select at least user preferences for color reproduction; and

storing in memory at least tonal transfer curves for a plurality of color channels, color image data, and one or more color transformations for converting a first set of color coordinates into a second set of coordinates wherein said tonal transfer curves and said one or more color transformations are at least partly in accordance with calibration data in device-independent units of color and are useable in combination to control rendering of said color image data, and at least one of said one or more color transformations is a chromatic adaptation transform useable to compensate for change in viewing conditions.

29. The method according to claim 28 further comprising the step of enabling the user to display a reproduction of said color image data on the display, and to associate annotations with said reproduction.

30. The method according to claim 28 wherein said storing step further comprises storing in the memory gamut data of at least the color output device or another color device in device independent units of color for use in combination with said tonal transfer curves and said one or more color transformations to control rendering of said color image data for improved color matching between said color output device and said another color device.

31. The method according to claim 28 further comprising the steps of enabling display of parts of said color image data which are outside the gamut of the color output device and storing a data structure in said memory whose inputs are color values and whose outputs indicate whether input values are either in or out of gamut for the color output device.

32. The method according to claim 28 wherein said gamut data comprises the darkest color reproducible by the color output device and said darkest color is useable in gamut mapping.

33. The method according to claim 28 further comprising the step of providing a colorant-to-colorant transformation which enables proofing or simulation of one output device by another.

34. The method according to claim 28 further comprising the step of gamut mapping of color wherein planes of lightness are shifted in order to map input neutrals to output neutrals.

35. The method according to claim 28 further comprising the step of enabling rendering of said color image data.

36. The method according to claim 29 further comprising the step of enabling communication with one or more other computer systems through a network interface of said computer system, in which said annotations are communicated to one or more users at one or more other computer systems.

37. The method according to claim 28 further comprising the step of displaying on the display user preferences for one or more of GCR, UCR or maximum black.

38. The method according to claim 37 wherein said user preferences further comprise a neutral definition in terms of mixtures of colorants, wherein one or more neutral definitions are displayed graphically.

39. The method according to claim 28 further comprising the step of displaying on the display a sequence of processing of said color image data.

40. The method according to claim 28 further comprising the step of displaying on the display connections among computers linked for communication through network interfaces.

41. The method according to claim 28 further comprising the step of configuring a workflow for processing said color image data by assembling elements representative of said workflow on the display.

42. The method according to claim 28 further comprising the step of displaying on the display a graphical comparison of the gamuts of at least two devices.

43. A computer-readable medium encoded with a computer program for controlling color rendering on at least one color output device comprising:

a program which enables a user interface for displaying a menu of selections to a user and is useable for providing at least user preferences for color reproduction; and

data representing at least tonal transfer curves for a plurality of color channels and one or more color transformations for converting a first set of color coordinates into a second set of coordinates, wherein said tonal transfer curves and said one or more color transformations are at least partly in accordance with calibration data in device-independent units of color and are useable in combination to control rendering on a color output device, and wherein at least one of said one or more color transformations is a chromatic adaptation transform useable to compensate for change in viewing conditions.

44. The computer-readable medium according to claim 43 wherein said program further enables the user to display a reproduction on a display and to associate annotations with said reproduction, wherein said annotations are shareable with one or more computer systems linked through network interfaces.

45. The computer-readable medium according to claim 43 wherein said data further represents gamut data of at least the color output device or another color device in device independent units of color for use in combination with said tonal transfer curves and said one or more color transformations to control rendering for improved color matching between said color output device and said another color device.

46. The computer-readable medium according to claim 45 wherein said data further represents color image data, and said tonal transfer curves and said one or more color transformations are useable in combination to control rendering of said color image data on the color output device in order to enable improved color matching in relation to a reference color reproduction.

47. The computer-readable medium according to claim 46 further providing one or more modules for translating said color image data for rendering on the color output device.

48. The computer-readable medium according to claim 46 wherein said program enables display of parts of said color image data which are outside the gamut of the color output device.

49. The computer-readable medium according to claim 45 wherein said gamut data comprises the darkest color reproducible by the color output device and said darkest color is useable in gamut mapping.

50. The computer-readable medium according to claim 43 wherein said data further represents a colorant-to-colorant transformation which enables proofing or simulation of one output device by another.

51. The computer-readable medium according to claim 43 wherein said data further represents gamut mapping of the input colors to the output colors wherein planes of lightness are shifted in order to map input neutrals to output neutrals.

52. The computer-readable medium according to claim 43 wherein said program enables the user to control the use of a black colorant.

53. The computer-readable medium according to claim 43 wherein said user preferences comprise a neutral definition in terms of mixtures of colorants, wherein one or more neutral definitions are graphically displayable.

54. The computer-readable medium according to claim 43 wherein said program displays a sequence of processing of said color image data.

55. The computer-readable medium according to claim 43 wherein said program displays connections among computers linked for communication through network interfaces.

56. The computer-readable medium according to claim 43 wherein said data further comprises color image data and a data structure useable for indicating the portions of said color image data that are outside the color gamut of the color output device in which said data structure has inputs which are color values and outputs which provide indications of colors which are out of gamut.

57. The computer-readable medium according to claim 43 wherein said program further enables a user to configure a workflow for processing color image data.

58. The computer-readable medium according to claim 43 wherein said program enables comparison of the gamuts of at least two devices.

59. The computer-readable medium according to claim 49 wherein said gamut mapping expands at least the dynamic range said color image data for rendering in accordance with said gamut data of said color output device.

60. The computer-readable medium according to claim 43 further comprising at least one file associated with said color reproduction for storing information having at least said user preferences for said reproduction.

61. The computer-readable medium according to claim 43 wherein the color output device utilizes a plurality of neutral colorants.

62. A color rendering system comprising:

a computer system having a network interface for communication over a network;

a display coupled to said computer system, said computer system providing a user interface for displaying a menu of selections to a user;

a user input device operable in combination with said display and said computer system for enabling said user to choose among said menu of selections expressing at least user preferences for color reproduction; and

memory for storing at least tonal transfer curves for a plurality of color channels, color image data, a chromatic adaptation transform useable when needed to adjust rendering in accordance with viewing conditions, and one or more color transformations for converting a first set of color coordinates into a second set of coordinates, wherein said tonal transfer curves and said one or more color transformations are at least partly in accordance with calibration data in device-independent units of color and are useable in combination with said chromatic adaptation transform to control rendering in accordance with said user preferences when said color image data is rendered by a least one rendering device.

63. The system according to claim 62 wherein said user interface further enables said user to display a reproduction of said color image data, and to associate annotations with said reproduction, in which said annotations are shareable with one or more other computer systems.

64. The system according to claim 62 wherein said memory further stores gamut data of said at least one color rendering device or another color device in device independent units of color.

65. The system according to claim 64 wherein said gamut data comprises the darkest color reproducible by said at least one color rendering device and said darkest color is useable in gamut mapping.

66. The system according to claim 62 wherein said memory further stores information which enables proofing or simulation of one output device by another.

67. The system according to claim 62 wherein said computer system provides gamut mapping of input colors to output colors wherein planes of constant lightness are shifted in order to map input neutrals to output neutrals.

68. The system according to claim 62 wherein said menu of selections comprise at least neutral definition in terms of mixtures of colorants and one or more of GCR, UCR or maximum black, wherein said neutral definition is displayed graphically for a user.

69. The system according to claim 62 wherein said user interface displays the sequence of processing of said color image data on said display.

70. The system according to claim 62 wherein said user interface displays on said display connections among computers linked to said computer system for communication through said network interface.

71. The system according to claim 63 wherein said user interface enables interactive conferencing among said computer system and said one or more other computer systems.

72. The system according to claim 62 wherein said user interface enables comparison of the gamuts of at least two devices.

73. The system according to claim 62 wherein said memory further stores a data structure providing indications of colors which are outside the gamut of said at least one rendering device.

74. The system according to claim 62 wherein said user input device enables a user to configure on said display a workflow for processing color image data.

75. A color rendering system to improve color matching in relation to at least one other color output device comprising:

a computer system having a network interface allowing for communication with one or more other computers and a linkage for a color output device; and

memory for storing tonal transfer curves for the color channels of said color output device, one or more color transformations for converting a first set of color coordinates into a second set of coordinates for said color output device, color image data, and programs and data for providing a user interface to a user, wherein said tonal transfer curves and said one or more color transformations are at least partly in accordance with calibration data in device-independent units of color and are useable in combination to control rendering by said color output device, and wherein said user interface enables a user to configure a workflow for processing color image data by assembling elements representative of said workflow on a display.

76. The system according to claim 75 wherein said workflow comprises a sequence of operations selectable by a user and said user interface enables said user to apply one or more of said operations to said color image data.

77. The system according to claim 76 wherein said sequence of operations includes at least said one or more color transformations.

78. A computer-readable medium encoded with a computer program for processing color image data for reproduction on at least one color rendering device comprising:

a program which enables a user interface for displaying a menu of selections to a user and is useable for providing at least user preferences for reproduction of said color image data, and to make annotations for association with said color image data;

at least one file for storing information having at least user preferences for reproduction; and

data representing at least tonal transfer curves for a plurality of color channels, and one or more color transformations for converting a first set of color coordinates into a second set of coordinates, wherein said tonal transfer curves and said one or more color transformations are at least partly in accordance with calibration data in device-independent units of color and are useable in combination to control said reproduction on said at least one color rendering device responsive to said user preferences.

79. The computer-readable medium according to claim 78 wherein said user interface enables said user to visualize on said display portions of said color image data that are outside the color gamut of the color output device.

80. The computer-readable medium according to claim 79 wherein said program enables display of any portion of said color image data which is outside the gamut of said at least one color rendering device and said data further comprises a data structure having inputs which are color values and outputs providing indications of colors which are out of gamut for said at least one color rendering device.

81. The computer-readable medium according to claim 78 wherein said program provides selection of one or more of GCR, UCR or maximum black and enables specification of a neutral definition in terms of mixtures of colorants and graphical display of said neutral definition.

82. The computer-readable medium according to claim 78 wherein said data further comprise gamut data of said color rendering device, said gamut data comprising at least a darkest color within the gamut of said color rendering device for use in gamut mapping said color image data on said color rendering device.

83. The computer-readable medium according to claim 78 wherein said at least one file is sharable between users at different sites and said program further enables said users at said different sites to conference interactively regarding processing of said color image data by communicating said annotations.

84. The computer-readable medium according to claim 82 wherein said gamut mapping expands at least the dynamic range said color image data for rendering in accordance with said gamut data of said color rendering device.

85. The computer-readable medium according to claim 78 wherein said at least one file has a header comprising one or more pointers to fields of data which include at least a neutral definition function.