COLOR CONVERTING METHOD, COLOR CONVERTING APPARATUS, AND RECORDING MEDIUM

• US 20110216335A1
• Filed: 03/03/2011
• Published: 09/08/2011
• Est. Priority Date: 03/05/2010
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: HORITA, Shuhei
• Granted Patent: US 8,619,324 B2
• Time in Patent Office: Days
• US Class Current: 358/1.9
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 1/6033 using test pattern analysis H04N1/6055 takes precedence
• CPC Class Codes: H04N 1/6088 by viewing conditions, i.e. conditions at picture output
• CPC Class Codes: H04N 1/6097 depending on the characteristics of the output medium, e.g. glossy paper, matt paper, transparency or fabrics

Abstract

A first profile corresponding to a first print is generated based on first spectral data of a first print and third spectral data of a light source, which serves as an observational light source for the first print. A second profile corresponding to a second protective-film-covered print is generated based on spectral data of a second print, second spectral data of a second laminating film, and third spectral data of a light source, which serves as an observational light source for the second protective-film-covered print. Using the first profile as an input profile and the second profile as an output profile, colors of image data representing an image of the first print are converted into colors of image data representing an image of the second print.

Claims

1. A color converting method comprising:

a first acquiring step of acquiring an optical property value of a first print printed on a first medium and an optical property value of a second print printed on a second medium, which is either the same as or different from the first medium;

a second acquiring step of acquiring an optical property value of a second protective film that covers the second print;

a third acquiring step of acquiring a spectral distribution of a first light source, which serves as an observational light source for the first print, and a spectral distribution of a second light source, which is either the same as or different from the first light source and which serves as an observational light source for a second protective-film-covered print produced by covering the second print with the second protective film;

a first generating step of generating a first profile corresponding to the first print based on the acquired optical property value of the first print and the acquired spectral distribution of the first light source;

a second generating step of generating a second profile corresponding to the second protective-film-covered print based on the acquired optical property value of the second print, the acquired optical property value of the second protective film, and the acquired spectral distribution of the second light source; and

a color converting step for converting colors of image data representing an image of the first print into colors of image data representing an image of the second print, using the generated first profile as an input profile and the generated second profile as an output profile.

2. A color converting method according to claim 1, wherein the first acquiring step further comprises the steps of:

designating types of mediums; and

acquiring the optical property values corresponding to the designated types of mediums by referring to a database or by colorimetrically measuring the prints.

3. A color converting method according to claim 1, wherein the second acquiring step further comprises the steps of:

designating a type of protective film; and

acquiring the optical property value corresponding to the designated type of protective film by referring to a database or by measuring the protective film.

4. A color converting method according to claim 1, wherein the third acquiring step further comprises the steps of:

designating types of light sources; and

acquiring the spectral distributions corresponding to the designated types of light sources by referring to a database or by measuring the light sources.

5. A color converting method according to claim 1, wherein the color converting step further comprises the step of:

mapping a color value of a black point with respect to the first profile onto a color value of a black point with respect to the second profile.

6. A color converting method according to claim 1, wherein the mediums comprise reflective mediums, the optical property values of the prints comprise spectral reflectances, and the optical property values of the protective films comprise two independent optical property values among an inherent reflectance, a scattering coefficient, and an absorption coefficient at each light wavelength of the protective films.

7. A color converting method according to claim 1, wherein the mediums comprise transmissive mediums, and the optical property values of the prints and the optical property values of the protective films comprise spectral transmittances.

8. A color converting method comprising:

a first acquiring step of acquiring an optical property value of a first print printed on a first medium and an optical property value of a second print printed on a second medium, which is either the same as or different from the first medium;

a second acquiring step of acquiring an optical property value of a first protective film that covers the first print and an optical property value of a second protective film that covers the second print, the second protective film being either the same as or different from the first protective film;

a third acquiring step of acquiring a spectral distribution of a first light source, which serves as an observational light source for a first protective-film-covered print produced by covering the first print with the first protective film, and a spectral distribution of a second light source, which is either the same as or different from the first light source and which serves as an observational light source for a second protective-film-covered print produced by covering the second print with the second protective film;

a first generating step of generating a first profile corresponding to the first protective-film-covered print based on the acquired optical property value of the first print, the acquired optical property value of the first protective film, and the acquired spectral distribution of the first light source;

a second generating step of generating a second profile corresponding to the second protective-film-covered print based on the acquired optical property value of the second print, the acquired optical property value of the second protective film, and the acquired spectral distribution of the second light source; and

a color converting step of converting colors of image data representing an image of the first print into colors of image data representing an image of the second print, using the generated first profile as an input profile and the generated second profile as an output profile.

9. A color converting method according to claim 8, wherein the second print is not covered with the second protective film;

the second acquiring step acquires the optical property value of the first protective film that covers the first print;

the third acquiring step acquires the spectral distribution of the first light source, which serves as the observational light source for the first protective-film-covered print produced by covering the first print with the first protective film, and the spectral distribution of the second light source, which serves as the observational light source for the second protective-film-covered print; and

the second generating step generates the second profile corresponding to the second print based on the acquired optical property value of the second print and the acquired spectral distribution of the second light source.

10. A color converting method according to claim 8, wherein the first acquiring step further comprises the steps of:

designating types of mediums; and

acquiring the optical property values corresponding to the designated types of mediums by referring to a database or by colorimetrically measuring the prints.

11. A color converting method according to claim 8, wherein the second acquiring step further comprises the steps of:

designating types of protective films; and

acquiring the optical property values corresponding to the designated types of protective films by referring to a database or by measuring the protective films.

12. A color converting method according to claim 8, wherein the third acquiring step further comprises the steps of:

designating types of light sources; and

acquiring the spectral distributions corresponding to the designated types of light sources by referring to a database or by measuring the light sources.

13. A color converting method according to claim 8, wherein the color converting step further comprises the step of:

mapping a color value of a black point with respect to the first profile onto a color value of a black point with respect to the second profile.

14. A color converting method according to claim 13, further comprising the steps of:

displaying an image according to a GUI;

designating a type of the first protective film or the second protective film based on a user operation according to the GUI; and

changing the image according to the GUI, so as to disable a selection as to whether to carry out the mapping step if the type of the first protective film or the second protective film is designated as not covering a print, and to enable a selection as to whether to carry out the mapping step if the type of the first protective film or the second protective film is designated otherwise.

15. A color converting method according to claim 8, wherein the mediums comprise reflective mediums, the optical property values of the prints comprise spectral reflectances, and the optical property values of the protective films comprise two independent optical property values among an inherent reflectance, a scattering coefficient, and an absorption coefficient at each light wavelength of the protective films.

16. A color converting method according to claim 8, wherein the mediums comprise transmissive mediums, and the optical property values of the prints and the optical property values of the protective films comprise spectral transmittances.

17. A color converting apparatus comprising:

a first acquirer for acquiring an optical property value of a first print printed on a first medium and an optical property value of a second print printed on a second medium, which is either the same as or different from the first medium;

a second acquirer for acquiring an optical property value of a second protective film that covers the second print;

a third acquirer for acquiring a spectral distribution of a first light source, which serves as an observational light source for the first print, and a spectral distribution of a second light source, which is either the same as or different from the first light source and which serves as an observational light source for a second protective-film-covered print produced by covering the second print with the second protective film;

a profile generator for generating a first profile corresponding to the first print based on the optical property value of the first print acquired by the first acquirer and the spectral distribution of the first light source acquired by the third acquirer, and generating a second profile corresponding to the second protective-film-covered print based on the optical property value of the second print acquired by the first acquirer, the optical property value of the second protective film acquired by the second acquirer, and the spectral distribution of the second light source acquired by the third acquirer; and

a color converter for converting colors of image data representing an image of the first print into colors of image data representing an image of the second print, using the first profile generated by the profile generator as an input profile and the second profile generated by the profile generator as an output profile.

18. A color converting apparatus comprising:

a first acquirer for acquiring an optical property value of a first print printed on a first medium and an optical property value of a second print printed on a second medium, which is either the same as or different from the first medium;

a second acquirer for acquiring an optical property value of a first protective film that covers the first print and an optical property value of a second protective film that covers the second print, the second protective film being either the same as or different from the first protective film;

a third acquirer for acquiring a spectral distribution of a first light source, which serves as an observational light source for a first protective-film-covered print produced by covering the first print with the first protective film, and a spectral distribution of a second light source, which is either the same as or different from the first light source and which serves as an observational light source for a second protective-film-covered print produced by covering the second print with the second protective film;

a profile generator for generating a first profile corresponding to the first protective-film-covered print based on the optical property value of the first print acquired by the first acquirer, the optical property value of the first protective film acquired by the second acquirer, and the spectral distribution of the first light source acquired by the third acquirer, and generating a second profile corresponding to the second protective-film-covered print based on the optical property value of the second print acquired by the first acquirer, the optical property value of the second protective film acquired by the second acquirer, and the spectral distribution of the second light source acquired by the third acquirer; and

a color converter for converting colors of image data representing an image of the first print into colors of image data representing an image of the second print, using the first profile generated by the profile generator as an input profile and the second profile generated by the profile generator as an output profile.

19. A recording medium storing therein a program to be executed by a computer, the program enabling the computer to function as:

a first acquirer for acquiring an optical property value of a first print printed on a first medium and an optical property value of a second print printed on a second medium, which is either the same as or different from the first medium;

a second acquirer for acquiring an optical property value of a second protective film that covers the second print;

a third acquirer for acquiring a spectral distribution of a first light source, which serves as an observational light source for the first print, and a spectral distribution of a second light source, which is either the same as or different from the first light source and which serves as an observational light source for a second protective-film-covered print produced by covering the second print with the second protective film;

a profile generator for generating a first profile corresponding to the first print based on the optical property value of the first print acquired by the first acquirer and the spectral distribution of the first light source acquired by the third acquirer, and generating a second profile corresponding to the second protective-film-covered print based on the optical property value of the second print acquired by the first acquirer, the optical property value of the second protective film acquired by the second acquirer, and the spectral distribution of the second light source acquired by the third acquirer; and

a color converter for converting colors of image data representing an image of the first print into colors of image data representing an image of the second print, using the first profile generated by the profile generator as an input profile and the second profile generated by the profile generator as an output profile.

20. A recording medium storing therein a program to be executed by a computer, the program enabling the computer to function as:

a first acquirer for acquiring an optical property value of a first print printed on a first medium and an optical property value of a second print printed on a second medium, which is either the same as or different from the first medium;

a second acquirer for acquiring an optical property value of a first protective film that covers the first print and an optical property value of a second protective film that covers the second print, the second protective film being either the same as or different from the first protective film;

a third acquirer for acquiring a spectral distribution of a first light source, which serves as an observational light source for a first protective-film-covered print produced by covering the first print with the first protective film, and a spectral distribution of a second light source, which is either the same as or different from the first light source and which serves as an observational light source for a second protective-film-covered print produced by covering the second print with the second protective film;

a profile generator for generating a first profile corresponding to the first protective-film-covered print based on the optical property value of the first print acquired by the first acquirer, the optical property value of the first protective film acquired by the second acquirer, and the spectral distribution of the first light source acquired by the third acquirer, and generating a second profile corresponding to the second protective-film-covered print based on the optical property value of the second print acquired by the first acquirer, the optical property value of the second protective film acquired by the second acquirer, and the spectral distribution of the second light source acquired by the third acquirer; and

a color converter for converting colors of image data representing an image of the first print into colors of image data representing an image of the second print, using the first profile generated by the profile generator as an input profile and the second profile generated by the profile generator as an output profile.