Method for including traditional photographic calibration into digital color management

• US 6,836,345 B1
• Filed: 03/29/2000
• Issued: 12/28/2004
• Est. Priority Date: 03/29/2000
• Status: Expired due to Fees

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Setchell, John S.
• Primary Examiner(s): ROGERS, SCOTT A
• Application Number:
  US09/538,421
• Time in Patent Office: 1,735 Days
• Field of Search: 358/504, 358/296, 358/527, 358/1.9, 358/518, 358/519, 358/506, 382/162, 382/167, 345/593
• US Class Current: 358/1.9
• CPC Class Codes: H04N 1/6055 using test pattern analysis

Abstract

A method for incorporating photographic calibration into digital color management having an abstract color transformation profile includes the steps of: (a) generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches; (b) scanning said film in a transmission scanner and generating film image data; (c) transforming the film image data to data in a first profile connection space using the color management system; (d) reading said optical reproduction and generating reproduction image data; (e) transforming the reproduction image data to data in a second profile connection space using a color management system; and (f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space.

Claims

1. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said photographic film in a transmission scanner and generating film image data;

(c) transforming the film image data to data in a first profile connection space using the color management system;

(d) reading said optical reproduction and generating reproduction image data;

(e) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the transmission scanner included in step (b) includes a transmission scanner profile and the method further comprises the step of combining the abstract profile with the transmission scanner profile.

2. The method as claimed in claim 1 wherein the optical reproduction generated in step (a) is an optical print.

3. The method as claimed in claim 2 wherein the reading of said optical reproduction in step (d) comprises scanning said optical print on a reflection scanner.

4. The method as claimed in claim 1 wherein the optical reproduction generated in step (a) is a photographic transparency.

5. The method as claimed in claim 4 wherein the reading of said optical reproduction in step (d) comprises scanning said photographic transparency on a transmission scanner.

6. The method as claimed in claim 1 wherein the reading of said optical reproduction in step (d) comprises measuring the colors of the target patches on the optical reproduction with a spectrophotometer.

7. The method as claimed in claim 1 wherein the reading of said optical reproduction in step (d) comprises measuring the colors of the target patches on the optical reproduction with a colorimeter.

8. The method as claimed in claim 1, wherein the computation of an abstract profile in step (f) is accomplished using a polynomial model technique.

9. The method as claimed in claim 1 further comprising the step of storing the abstract profile.

10. The method as claimed in claim 1 wherein the optical reproduction generated in step (a) is generated from a photographic negative.

11. The method as claimed in claim 1 wherein the optical reproduction generated in step (a) is generated from a photographic slide.

12. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said photographic film in a transmission scanner and generating film image data;

(c) transforming the film image data to data in a first profile connection space using the color management system;

(d) reading said optical reproduction and generating reproduction image data;

(e) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the step (f) of computing an abstract profile includes the correction of tone scale and other color differences before computing the abstract profile.

13. The method as claimed in claim 12 wherein the optical reproduction generated in step (a) is an optical print.

14. The method as claimed in claim 13 wherein the reading of said optical reproduction in step (d) comprises scanning said optical print on a reflection scanner.

15. The method as claimed in claim 12 wherein the optical reproduction generated in step (a) is a photographic transparency.

16. The method as claimed in claim 15 wherein the reading of said optical reproduction in step (d) comprises scanning said photographic transparency on a transmission scanner.

17. The method as claimed in claim 12 wherein the reading of said optical reproduction in step (d) comprises measuring the colors of the target patches on the optical reproduction with a spectrophotometer.

18. The method as claimed in claim 12 wherein the reading of said optical reproduction in step (d) comprises measuring the colors of the target patches on the optical reproduction with a calorimeter.

19. The method as claimed in claim 12 wherein the computation of an abstract profile in step (f) is accomplished using a polynomial model technique.

20. The method as claimed in claim 12 further comprising the step of storing the abstract profile.

21. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) generating optical reproduction data from a photographic negative containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said negative in a transmission scanner and generating negative image data;

(c) transforming the negative image data to data in a first profile connection space using the color management system;

(d) transforming the optical reproduction data to data in a second profile connection space using the color management system; and

(e) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the transmission scanner included in step (b) includes a transmission scanner profile and the method further comprises the step of combining the abstract profile with the transmission scanner profile.

22. The method as claimed in claim 21 wherein generating optical reproduction data in step (a) comprises displaying the image of the target on a calibrated computer monitor and modifying the image on the monitor until modified image data is obtained corresponding to a satisfactory appearance of the image and step (d) comprises transforming the modified image data to data in a second profile connection space using the color management system.

23. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) generating optical reproduction data from a photographic negative containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said negative in a transmission scanner and generating negative image data;

(c) transforming the negative image data to data in a first profile connection space using the color management system;

(d) transforming the optical reproduction data to data in a second profile connection space using the color management system; and

(e) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein generating optical reproduction data in step (a) comprises computing print densities from transmission densities of the target patches from the photographic negative and step (d) comprises transforming the print densities to data in a second profile connection space using the color management system.

36. The system as claimed in claim 23 wherein the means for reading said optical reproduction comprises a transmission scanner for scanning said photographic transparency.

24. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) generating an optical reproduction from a photographic negative containing an image of a target having a plurality of colored and neutral patches;

(b) capturing an image of the target with a digital camera and generating camera image data;

(c) transforming the camera image data to data in a first profile connection space using the color management system;

(d) reading said optical reproduction and generating reproduction image data;

(e) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the step (f) of computing an abstract profile includes the correction of tone scale and other color differences before computing the abstract profile.

25. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) capturing an image of a target having a plurality of colored and neutral patches on both a photographic negative and a photographic transparency;

(b) generating an optical reproduction from the photographic negative;

(c) scanning said photographic transparency in a transmission scanner and generating transparency image data;

(d) transforming the transparency image data to data in a first profile connection space using the color management system;

(e) reading said optical reproduction and generating reproduction image data;

(f) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(g) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the transmission scanner included in step (c) includes a transmission scanner profile and the method further comprises the step of combining the abstract profile with the transmission scanner profile.

26. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) generating a print from a photographic negative containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said negative in a transmission scanner and generating negative image data;

(c) transforming the negative image data to data in a first profile connection space using the color management system;

(d) scanning said print in a reflection scanner and generating reproduction image data;

(e) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the transmission scanner included in step (b) includes a transmission scanner profile and the method further comprises the step of combining the abstract profile with the transmission scanner profile.

27. A digital color management method incorporating photographic calibration for reproducing an image from a photographic film, said method comprising the steps of:

scanning said photographic film in a transmission scanner and generating photographic film image data;

transforming the photographic film image data by means of a transmission scanner profile to data in a first profile connection space;

transforming the data in the first profile connection space by means of an abstract profile to data in a second profile connection space; and

processing the data in the second profile connection space through a destination profile in order to form a reproduction of the image, wherein the abstract profile is computed in a calibration process by;

(a) generating an optical reproduction from a photographic target film containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said target film in the transmission scanner and generating target film image data;

(c) transforming the target film image data to target data in the first profile connection space using the color management system;

(d) reading said optical reproduction and generating reproduction target image data;

(e) transforming the reproduction target image data to target data in the second profile connection space using the color management system; and

(f) computing the abstract profile to transform said target data in the first profile connection space to target data in the second profile connection space;

wherein the abstract profile is combined with the transmission scanner profile to form a single source profile for transforming the photographic film data into data in a single profile connection space, and the data in the single profile connection space is then processed through the destination profile.

28. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) generating optical reproduction data from a photographic negative containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said negative in a transmission scanner and generating negative image data;

(c) transforming the negative image data to data in a first profile connection space using the color management system;

(d) transforming the optical reproduction data to data in a second profile connection space using the color management system; and

(e) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the step (e) of computing an abstract profile includes the correction of tone scale and other color differences before computing the abstract profile.

29. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) capturing an image of a target having a plurality of colored and neutral patches on both a photographic negative and a photographic transparency;

(b) generating an optical reproduction from the photographic negative;

(c) scanning said photographic transparency in a transmission scanner and generating transparency image data;

(d) transforming the transparency image data to data in a first profile connection space using the color management system;

(e) reading said optical reproduction and generating reproduction image data;

(f) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(g) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the step (g) of computing an abstract profile includes the correction of tone scale and other color differences before computing the abstract profile.

30. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said method comprising the steps of:

(a) generating a print from a photographic negative containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said negative in a transmission scanner and generating negative image data;

(c) transforming the negative image data to data in a first profile connection space using the color management system;

(d) scanning said print in a reflection scanner and generating reproduction image data;

(e) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the step (f) of computing an abstract profile includes the correction of tone scale and other color differences before computing the abstract profile.

31. A method for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said system comprising:

generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches;

scanning said photographic film and generating film image data;

reading said optical reproduction and generating reproduction image data;

transforming the film image data to data in a first profile connection space and transforming the reproduction image data to data in a second profile connection space; and

computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the generating of an optical reproduction from the film and subsequently reading of the optical reproduction further comprises computing print densities from transmission densities of the target patches from the photographic film, whereby the print densities become the reproduction image data that is transformed into the second profile connection space.

32. A system for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said system comprising:

means for generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches;

a transmission scanner for scanning said photographic film and generating film image data;

means for reading said optical reproduction and generating reproduction image data;

a processor using the color management system for transforming the film image data to data in a first profile connection space and for transforming the reproduction image data to data in a second profile connection space; and

an algorithm for computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the means for generating an optical reproduction from the film and subsequently reading the optical reproduction comprises means for computing print densities from transmission densities of the target patches from the photographic film, whereby the print densities become the reproduction image data that is transformed into the second profile connection space.

33. The system as claimed in claim 32 wherein the photographic film is a negative and the optical reproduction is an optical print.

34. The system as claimed in claim 33 wherein the means for reading said optical reproduction comprises a reflection scanner for scanning said optical print.

35. The system as claimed in claim 32 wherein the optical reproduction is a photographic transparency.

37. The system as claimed in claim 32 wherein the means for reading said optical reproduction comprises a spectrophotometer for measuring the colors of the target patches on the optical reproduction.

38. The system as claimed in claim 32 wherein the means for reading said optical reproduction comprises a colorimeter for measuring the colors of the target patches on the optical reproduction.

39. The system as claimed in claim 32 wherein the algorithm for computation of an abstract profile includes a polynomial model technique.

40. The system as claimed in claim 32 further comprising a store for storing the abstract profile.

41. A system for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said system comprising:

means for generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches;

a transmission scanner for scanning said photographic film and generating photographic film image data;

means for reading said optical reproduction and generating reproduction image data;

a processor using the color management system for transforming the photographic film image data to data in a first profile connection space and for transforming the reproduction image data to data in a second profile connection space; and

an algorithm for computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the processor uses a transmission scanner profile for transforming the photographic film image data to data in a first profile connection space, and wherein the abstract profile is combined with the transmission scanner profile.

42. A computer program product for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said computer program product comprising:

a computer readable storage medium having a computer program stored thereon for performing the steps of;

(a) generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said photographic film in a transmission scanner and generating film image data;

(c) transforming the film image data to data in a first profile connection space using the color management system;

(d) reading said optical reproduction and generating reproduction image data;

(e) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the transmission scanner included in step (b) includes a transmission scanner profile and the method further comprises the step of combining the abstract profile with the transmission scanner profile.

43. The computer program product as claimed in claim 42 wherein the computation of an abstract profile in step (f) is accomplished using a polynomial model technique.

44. The computer program product as claimed in claim 42 further comprising the step of storing the abstract profile.

45. A computer program product for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said computer program product comprising:

a computer readable storage medium having a computer program stored thereon for performing the steps of;

(a) generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said photographic film in a transmission scanner and generating film image data;

(c) transforming the film image data to data in a first profile connection space using the color management system;

(d) reading said optical reproduction and generating reproduction image data;

(e) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein generating an optical reproduction in step (a) comprises computing print densities from transmission densities of the target patches from the photographic film.

46. A computer program product for incorporating photographic calibration into a digital color management system having an abstract color transformation profile, said computer program product comprising:

a computer readable storage medium having a computer program stored thereon for performing the steps of;

(a) generating an optical reproduction from a photographic film containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said photographic film in a transmission scanner and generating film image data;

(c) transforming the film image data to data in a first profile connection space using the color management system;

(d) reading said optical reproduction and generating reproduction image data;

(e) transforming the reproduction image data to data in a second profile connection space using the color management system; and

(f) computing an abstract profile to transform said data in the first profile connection space to data in the second profile connection space;

wherein the step (f) of computing an abstract profile includes the correction of tone scale and other color differences before computing the abstract profile.

47. A computer program product for incorporating photographic calibration, said computer program product comprising:

a computer readable storage medium having a computer program stored thereon for performing the steps of;

scanning a photographic film in a transmission scanner and generating film image data;

transforming the film image data by means of a transmission scanner profile to data in a first profile connection space;

transforming the data in the first profile connection space by means of an abstract profile to data in a second profile connection space; and

processing the data in the second profile connection space through a destination profile in order to form a reproduction of the image, wherein the abstract profile is computed in a calibration process by;

(a) generating an optical reproduction from a photographic target film containing an image of a target having a plurality of colored and neutral patches;

(b) scanning said target film in the transmission scanner and generating target film image data;

(c) transforming the target film image data to target data in the first profile connection space using the color management system;

(d) reading said optical reproduction and generating reproduction target image data;

(e) transforming the reproduction target image data to target data in the second profile connection space using the color management system; and

(f) computing the abstract profile to transform said target data in the first profile connection space to target data in the second profile connection space;

wherein the abstract profile is combined with the transmission scanner profile to form a single source profile for transforming the film data into data in a single profile connection space, and the data in the single profile connection space is then processed through the destination profile.