Specification
Title of invention: Skin color chart and its manufacturing method
Technical field
[0001]
The present disclosure relates to a skin color chart and a manufacturing method thereof.
Background technology
[0002]
In recent years, face authentication systems have been developed that identify a person using a face image captured by a camera. Here, in a face image of a person with white skin such as Caucasian (Caucasian), overexposure tends to occur in a bright environment, and in a face image of a person with dark skin such as black (Negroid), it is dark. Black crushing is likely to occur in the environment.
[0003]
If such blown-out highlights or blocked-up shadows occur in the face image, face recognition may not be performed accurately. Therefore, for example, when installing a camera for a face authentication system, it is necessary to determine whether the environment for performing face authentication (hereinafter referred to as face authentication environment) is appropriate. The face authentication environment changes depending on, for example, the installation position and orientation of the camera, the brightness of the location where the image is taken, and the like.
[0004]
By the way, Patent Document 1 discloses a skin color chart for skin color reproduction evaluation in color photographs and the like.
In this specification, the terms “black (Negroid),” “white (Caucasoid),” and “yellow (Mongoloid)” are used to express differences in skin color. I have no intention of doing so.
prior art documents
patent literature
[0005]
Patent Document 1: JP-A-2001-074556
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0006]
The inventor took an image of a skin color chart with a camera, studied using the obtained image of the skin color chart to determine the face authentication environment, and found the following problems.
As described above, the skin color chart disclosed in Patent Document 1 is for skin color reproduction evaluation in color photographs, etc., and includes a standard white skin color display section and a standard black skin color display section. When judging the face authentication environment using this skin color chart, for example, in the acquired image of the skin color chart, there is no overexposure in the skin color display area for white people, and black crushing occurs in the skin color display area for black people. If not, it is determined that the environment is suitable for face authentication.
[0007]
However, even in an environment determined to be suitable for face recognition using the skin color chart disclosed in Patent Document 1, face recognition may not be performed accurately. Specifically, even if the environment is determined to be suitable for face recognition, the environment is actually too dark, and the face image of a person with a darker complexion than the standard black skin color display part in the skin color chart. Then, black crushing may occur. Conversely, in an environment that is actually too bright, blown-out highlights can occur in a face image of a person who is fairer than the standard white skin color display portion on the skin color chart.
[0008]
In view of such problems, an object of the present disclosure is to provide a skin color chart that can more appropriately determine the face authentication environment and a method of manufacturing the same.
Means to solve problems
[0009]
The skin color chart according to this disclosure is
the board and
a first skin color display section formed on the substrate and representing a negroid skin color;
a second skin color display section formed on the substrate and representing a caucasian skin color,
the lightness L* of the first skin color display portion in the CIE L*a*b* color space satisfies 20≦L*≦37,
The lightness L* of the second skin color display portion in the CIE L*a*b* color space satisfies 74≦L*≦81, and is a skin color chart for determining the environment in which face authentication is performed.
[0010]
The manufacturing method of the skin color chart according to the present disclosure is
a step of forming on the substrate a first skin color display portion representing the Negroid skin color;
forming on the substrate a second skin color display portion representing a caucasian skin color,
the lightness L* of the first skin color display portion in the CIE L*a*b* color space satisfies 20≦L*≦37,
In the method for manufacturing a skin color chart for determining the environment for face authentication, the lightness L* of the second skin color display portion in the CIE L*a*b* color space satisfies 74≦L*≦81.
Effect of the invention
[0011]
According to the present disclosure, it is possible to provide a skin color chart that can more appropriately determine the face authentication environment and a method for manufacturing the same.
Brief description of the drawing
[0012]
1 is a plan view showing a skin color chart according to a first embodiment; FIG.
2 is a graph showing an example of spectral reflectance of skin colors of black, white, and yellow people. FIG.
3 is a plan view showing a skin color chart according to a second embodiment; FIG.
4 is a plan view showing a skin color chart according to a third embodiment; FIG.
5 is a plan view showing a skin color chart according to a fourth embodiment; FIG.
6 is a plan view showing a skin color chart according to a fifth embodiment; FIG.
MODE FOR CARRYING OUT THE INVENTION
[0013]
Specific embodiments will be described in detail below with reference to the drawings. In each drawing, the same reference numerals are given to the same or corresponding elements, and redundant description will be omitted as necessary for clarity of description.
[0014]
(First embodiment)

First, a skin color chart according to the first embodiment will be described with reference to FIG. FIG. 1 is a plan view showing a skin color chart according to the first embodiment. The skin color chart 10 according to the first embodiment shown in FIG. 1 is for determining the face authentication environment.
As shown in FIG. 1, the skin color chart 10 according to the first embodiment includes a substrate 11, a first skin color display portion BK, and a second skin color display portion WT.
[0015]
The substrate 11 is made of, but not limited to, cardboard, plastic, wood, metal, glass, and combinations thereof. Constructing the substrate 11 from cardboard, plastic or wood makes it lightweight and therefore easy to carry. In the example shown in FIG. 1, the substrate 11 has a rectangular planar shape, but it is not limited at all. The size of the substrate 11 is also not particularly limited, but as an example, it is about 200 mm wide and about 300 mm long. The color of the substrate 11 is also not particularly limited, but from the viewpoint of preventing reflection, it is preferably black with a reflectance of 0, for example.
[0016]
As shown in FIG. 1, the first skin color display portion BK is formed on the substrate 11. As shown in FIG. The first skin color display portion BK indicates a skin color near the blackest limit in the black skin color distribution. Specifically, colors can be defined using the CIE L*a*b* color space standardized in 1976 by the International Commission on Illumination (CIE). The lightness L* of the skin color in the first skin color display portion BK represented in the CIE L*a*b* color space satisfies 20≦L*≦37. A normal black skin tone is lighter and has an L* value greater than 37. More preferably, 20≦L*≦29.
Also, the chromaticities a* and b* of the first skin color display portion BK satisfy, for example, 8≦a*≦12 and 7≦b*≦10. More preferably, 9≦a*≦11 and 8≦b*≦9.
In the example shown in FIG. 1, the first skin color display portion BK has a square planar shape, but is not limited in any way.
[0017]
As shown in FIG. 1, a second skin color display portion WT is also formed on the substrate 11. As shown in FIG. The second skin color display portion WT indicates a skin color near the whitest limit in the skin color distribution of Caucasians. Specifically, the lightness L* of the skin color in the second skin color display portion WT represented in the CIE L*a*b* color space satisfies 74≦L*≦81. A normal Caucasian skin tone is darker and has an L* value less than 74. More preferably, 78≦L*≦81.
Also, the chromaticities a* and b* of the second skin color display portion WT satisfy, for example, 10≦a*≦12 and 23≦b*≦25. More preferably, a*=11 and b*=24.
In the example shown in FIG. 1, the first skin color display portion BK has a square planar shape, but is not limited in any way.
[0018]
Here, FIG. 2 is a graph showing an example of spectral reflectance of skin colors of black, white, and yellow people. In FIG. 2, the horizontal axis indicates wavelength (nm), and the vertical axis indicates spectral reflectance. As shown in FIG. 2, at each wavelength, the spectral reflectance increases in the order of black people, yellow people, and white people. For example, when measured using a spectrophotometer, the spectral reflectance data shown in FIG. 2 and the corresponding L*, a*, and b* values ​​in the CIE L*a*b* color space are can get. For a large number of blacks and whites, skin color L*, a*, b* data can be obtained to determine the above ranges.
[0019]
When determining the face authentication environment using this skin color chart 10, the skin color chart 10 is imaged by a face authentication camera (not shown). Then, in the captured image of the skin color chart 10, if black crushing does not occur in the first skin color display portion BK and white saturation does not occur in the second skin color display portion WT, it is suitable for face authentication. environment.
[0020]
As described above, in the skin color chart 10 according to the present embodiment, the lightness L* of the skin color in the first skin color display portion BK satisfies 20≦L*≦37, and the first skin color display portion BK is the black skin color. Shows the skin color near the blackest end of the distribution. Therefore, it is extremely unlikely that a person with a darker complexion than the first skin color display portion BK will be the subject of face authentication. Therefore, in an environment determined to be suitable for face recognition using the skin color chart 10 according to the present embodiment, the possibility that black crushing occurs in the face image and face recognition is not possible is extremely low.
[0021]
On the other hand, the lightness L* of the skin color in the second skin color display section WT satisfies 74≦L*≦81, and the second skin color display section WT displays the skin color near the whitest limit in the skin color distribution of Caucasians. show. Therefore, it is extremely unlikely that a person whose fair complexion is lighter than that of the second skin color display portion WT will be a target person for face authentication. Therefore, in an environment determined to be suitable for face recognition using the skin color chart 10 according to the present embodiment, there is a very low possibility that overexposure will occur in the face image and face recognition will not be possible.
From the above, by using the skin color chart 10 according to the present embodiment, the face authentication environment can be determined more appropriately.
[0022]

Next, a method for manufacturing a skin color chart according to the first embodiment will be described with reference to FIG. A first skin color display portion BK is formed on the substrate 11, and a second skin color display portion WT is formed. Either the first skin color display portion BK or the second skin color display portion WT may be formed first on the substrate 11, or both may be formed at the same time.
[0023]
A specific example of the skin color chart manufacturing method according to the first embodiment will be described below, but the method is not limited to this specific example.
First, a first skin color display portion BK and a second skin color display portion WT prepared in advance are pasted on a mount made of cardboard. For example, the first skin color display portion BK and the second skin color display portion WT can be prepared by applying paints adjusted to the respective colors on paper. Although the paint is not particularly limited, it is, for example, a matte lacquer paint.
[0024]
Next, prepare a black cardboard of the same size as the mount, and cut out portions corresponding to the first skin color display portion BK and the second skin color display portion WT attached to the mount. Then, this black cardboard and the mount on which the first skin color display portion BK and the second skin color display portion WT are pasted are pasted together. Here, the black cardboard was processed so that the surface reflectance was 0 (zero).
By the above, the skin color chart 10 can be manufactured. In the skin color chart 10 produced according to this embodiment, the substrate 11 is composed of a backing paper and a black cardboard.
[0025]
As described above, in the skin color chart 10 according to the present embodiment, the first skin color display portion BK indicates the skin color near the blackest limit in the black skin color distribution, and the second skin color display portion WT indicates the skin color near the whitest limit in the distribution of Caucasian skin colors. Therefore, it is extremely unlikely that a person whose skin color is darker than the first skin color display portion BK or whose skin color is lighter than the second skin color display portion WT becomes a target person for face authentication. Therefore, in an environment determined to be suitable for face authentication using the skin color chart 10 according to the present embodiment, the face image suffers from crushed blacks and blown out highlights.The possibility of not being able to do so is extremely low. That is, by using the skin color chart 10 according to the present embodiment, the face authentication environment can be determined more appropriately.
[0026]
(Second embodiment)
Next, a skin color chart according to the second embodiment will be described with reference to FIG. FIG. 3 is a plan view showing a skin color chart according to the second embodiment.
In the skin color chart 10 according to the first embodiment shown in FIG. 1, the first skin color display portion BK and the second skin color display portion WT are formed planarly (flatly). On the other hand, in the skin color chart 10 according to the second embodiment shown in FIG. 3, the first skin color display portion BK and the second skin color display portion WT are formed in a three-dimensional shape imitating a human face. ing. That is, in the first skin color display portion BK and the second skin color display portion WT, unevenness that imitates a human face is formed.
[0027]
When the skin color chart 10 according to the first embodiment is used, even in an environment determined to be suitable for face authentication, for example, a concave part of the face (for example, the vicinity of the shadow of the nose) in a black person's face image is black. There is a possibility that it will be crushed and face authentication will not be possible. Alternatively, for example, whitening may occur in a convex portion of the face (for example, near the top of the nose) in a Caucasian face image, and face authentication may not be possible.
[0028]
On the other hand, when the skin color chart 10 according to the second embodiment is used, when judging the face authentication environment, it is determined that the environment in which black crushing occurs in the concave portion of the first skin color display portion BK is inappropriate. I can judge. In addition, it can be determined that the environment in which overexposure occurs on the convex portion of the second skin color display portion WT is also inappropriate.
Therefore, by using the skin color chart 10 according to the present embodiment, the face authentication environment can be determined more appropriately.
Other configurations are the same as those of the first embodiment, so descriptions thereof are omitted.
[0029]
(Third embodiment)
Next, a skin color chart according to the third embodiment will be described with reference to FIG. FIG. 4 is a plan view showing a skin color chart according to the third embodiment.
As shown in FIG. 4, the skin color chart 10 according to the present embodiment includes a first skin color display portion BK, a second skin color display portion WT, and a plurality of gray display portions GR having different reflectances. It has grayscale sections GS1 and GS2.
[0030]
In the example shown in FIG. 4, the two gray scale parts GS1 and GS2 each have ten gray display parts GR with a reflectance of 2 to 90%. Specifically, the reflectance of each gray display portion GR is 2%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90%.
[0031]
In the example shown in FIG. 4, in the gray scale sections GS1 and GS2, 10 gray display sections GR are arranged in a line along the long sides of the rectangular skin color chart 10. In the example shown in FIG. Also, the gray scale sections GS1 and GS2 are arranged opposite to each other with the first skin color display section BK and the second skin color display section WT interposed therebetween.
Using the grayscale parts GS1 and GS2, for example, the dynamic range of a face authentication camera (not shown) can be evaluated and adjusted.
[0032]
In the example shown in FIG. 4, each gray display portion GR has a square planar shape, but is not limited in any way. Also, the number of gray display portions GR included in the gray scale portions GS1 and GS2 and the reflectance of each gray display portion GR may be appropriately determined. Furthermore, the number of gray scale portions may be one.
Other configurations are the same as those of the first embodiment, so descriptions thereof are omitted. You may combine 2nd Embodiment and 3rd Embodiment.
[0033]
(Fourth embodiment)
Next, a skin color chart according to the fourth embodiment will be described with reference to FIG. FIG. 5 is a plan view showing a skin color chart according to the fourth embodiment.
As shown in FIG. 5, the skin color chart 10 according to this embodiment includes a third skin color display section YL in addition to the skin color chart 10 according to the third embodiment.
[0034]
As shown in FIG. 5, the third skin color display portion YL is also formed on the substrate 11 in the same manner as the first skin color display portion BK and the second skin color display portion WT. Although the arrangement position of the third skin color display portion YL is not particularly limited, in the example shown in FIG. is provided.
[0035]
The third skin color display portion YL represents a skin color between the skin color in the first skin color display portion BK and the skin color in the second skin color display portion WT. The third skin color display portion YL indicates, for example, a standard yellow human skin color. Specifically, the lightness L* of the skin color in the third skin color display portion YL expressed in the CIE L*a*b* color space satisfies, for example, 62≦L*≦68. Also, the chromaticities a* and b* of the third skin color display portion YL satisfy, for example, a*=11 and 18≦b*≦19.
[0036]
By providing the third skin color display unit YL, when determining the face authentication environment, the environment can be evaluated in more detail than in the first to third embodiments. Specifically, the environment in which the third skin color display portion YL, in addition to the first skin color display portion BK, also suffers from the black loss is darker than the environment in which the black loss occurs only in the first skin color display portion BK. I understand. Also, it can be seen that the environment in which overexposure occurs not only in the second skin color display portion WT but also in the third skin color display portion YL is brighter than the environment in which overexposure occurs only in the second skin color display portion WT. . Based on such an evaluation, it becomes easy to adjust, for example, the installation position and orientation of the camera, the brightness of the location where the image is taken, and the like.
[0037]
In the example shown in FIG. 5, the third skin color display portion YL has a square planar shape, but is not limited in any way.
Other configurations are the same as in the third embodiment, so descriptions thereof are omitted. You may combine 2nd Embodiment and 4th Embodiment. Also, in the fourth embodiment, the grayscale portions GS1 and GS2 may not be formed. In other words, the third skin color display section YL may be added to the skin color chart 10 according to the first embodiment.
[0038]
(Fifth embodiment)
Next, a skin color chart according to the fifth embodiment will be described with reference to FIG. FIG. 6 is a plan view showing a skin color chart according to the fifth embodiment.
As shown in FIG. 6, the skin color chart 10 according to the present embodiment includes a fourth skin color display section 14 and a fifth skin color display section 15 in addition to the skin color chart 10 according to the fourth embodiment.
[0039]
As shown in FIG. 6, the fourth skin color display portion 14 and the fifth skin color display portion 15 are also formed on the substrate 11. As shown in FIG. Although the arrangement positions of the fourth skin color display portion 14 and the fifth skin color display portion 15 are not particularly limited, in the example shown in FIG. 3 and the flesh color display portion YL. The fifth skin color display portion 15 is provided between the second skin color display portion WT and the third skin color display portion YL.
[0040]
The fourth skin color display portion 14 represents a skin color between the skin color in the first skin color display portion BK and the skin color in the third skin color display portion YL.
The fifth skin color display portion 15 represents a skin color between the skin color in the second skin color display portion WT and the skin color in the third skin color display portion YL.
[0041]
By providing the fourth skin color display unit 14, when determining the face authentication environment, the environment can be evaluated in more detail than in the fourth embodiment. Specifically, it is possible to distinguish between an environment in which the first skin-color display portion BK and the fourth skin-color display portion 14 are underexposed black and an environment in which only the first skin-color display portion BK is underexposed to black. Furthermore, an environment in which black crushing occurs in the first skin color display portion BK, the fourth skin color display portion 14, and the third skin color display portion YL, and the first skin color display portion BK and the fourth skin color display portion 14 It can be distinguished from an environment in which black crushing only occurs.
[0042]
Similarly, by providing the fifth skin color display unit 15, when determining the face authentication environment, the environment can be evaluated in more detail than in the fourth embodiment. Specifically, it is possible to distinguish between an environment in which overexposure occurs in the second skin color display portion WT and the fifth skin color display portion 15 and an environment in which overexposure occurs only in the second skin color display portion WT. Furthermore, the second skin color display portion WT, the fifth skin color display portion 15, and the third skin color display portion YL have an environment in which overexposure occurs, and the second skin color display portion WT and the fifth skin color display portion 15 It is possible to distinguish from an environment in which overexposure only occurs.
Based on such an evaluation, it becomes easier to adjust, for example, the installation position and orientation of the camera, and the brightness of the location where the image is taken.
[0043]
In the example shown in FIG. 6, the fourth skin color display portion 14 and the fifth skin color display portion 15 have a square planar shape, but are not limited in any way. Also, the skin color chart 10 may include only one of the fourth skin color display portion 14 and the fifth skin color display portion 15 .
Further, the skin color chart 10 may be provided with a plurality of fourth skin color display sections 14 that indicate different skin colors. Similarly, the skin color chart 10 may be provided with a plurality of fifth skin color display sections 15 showing different skin colors.
Further, in the present embodiment, the skin colors in the third skin color display section YL, the fourth skin color display section 14, and the fifth skin color display section 15 indicate, for example, the average skin color in a specific country or region. good too.
[0044]
Other configurations are the same as those of the fourth embodiment, so descriptions thereof are omitted. You may combine 2nd Embodiment and 5th Embodiment. Also, in the fifth embodiment, the grayscale portions GS1 and GS2 may not be formed. That is, the third skin color display section YL, the fourth skin color display section 14, and the fifth skin color display section 15 may be added to the skin color chart 10 according to the first embodiment.
[0045]
Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure.
[0046]
Some or all of the above embodiments can also be described as the following additional remarks, but are not limited to the following.
(Appendix 1)
the board and
a first skin color display section formed on the substrate and representing a negroid skin color;
a second skin color display section formed on the substrate and representing a caucasian skin color,
the lightness L* of the first skin color display portion in the CIE L*a*b* color space satisfies 20≦L*≦37,
the lightness L* of the second skin color display portion in the CIE L*a*b* color space satisfies 74≦L*≦81,
A skin color chart for judging the environment in which face authentication is performed.
(Appendix 2)
The first and second skin color display parts are formed in a three-dimensional shape imitating a human face,
The skin color chart according to appendix 1.
(Appendix 3)
further comprising a plurality of gray display parts with different reflectances formed on the substrate,
The skin color chart according to appendix 1 or 2.
(Appendix 4)
further comprising a third skin color display section formed on the substrate and representing a skin color between the skin color of the first skin color display section and the skin color of the second skin color display section,
the lightness L* of the third skin color display portion in the CIE L*a*b* color space satisfies 62≦L*≦68,
The skin color chart according to any one of Appendices 1 to 3.
(Appendix 5)
a fourth skin color display section representing a skin color between the skin color in the first skin color display section and the skin color in the third skin color display section;
and at least one of a fifth skin color display unit representing a skin color between the skin color in the second skin color display unit and the skin color in the third skin color display unit, further provided on the substrate,
Skin color chart according to appendix 4.
(Appendix 6)
the substrate is black,
The skin color chart according to any one of Appendices 1 to 5.
(Appendix 7)
a step of forming on the substrate a first skin color display portion representing the Negroid skin color;
forming on the substrate a second skin color display portion representing a caucasian skin color,
the lightness L* of the first skin color display portion in the CIE L*a*b* color space satisfies 20≦L*≦37,
the lightness L* of the second skin color display portion in the CIE L*a*b* color space satisfies 74≦L*≦81,
To determine the environment for facial recognitionmethod of manufacturing the skin color chart.
(Appendix 8)
forming the first and second skin color display parts into a three-dimensional shape that imitates a human face,
A method for producing a skin color chart according to appendix 7.
(Appendix 9)
further comprising the step of forming a plurality of gray display parts with different reflectances on the substrate,
A method for producing a skin color chart according to appendix 7 or 8.
(Appendix 10)
further comprising the step of forming on the substrate a third skin color display portion representing a skin color between the skin color of the first skin color display portion and the skin color of the second skin color display portion;
the lightness L* of the third skin color display portion in the CIE L*a*b* color space satisfies 62≦L*≦68,
A method for producing a skin color chart according to any one of Appendices 7 to 9.
(Appendix 11)
a fourth skin color display section representing a skin color between the skin color in the first skin color display section and the skin color in the third skin color display section;
forming on the substrate at least one of a fifth skin color display portion representing a skin color between the skin color of the second skin color display portion and the skin color of the third skin color display portion; ,
11. A method for producing a skin color chart according to appendix 10.
(Appendix 12)
the substrate is black,
A method for producing a skin color chart according to any one of Appendices 7 to 11.

The scope of the claims
[Claim 1]
the board and
a first skin color display section formed on the substrate and representing a negroid skin color;
a second skin color display section formed on the substrate and representing a caucasian skin color,
the lightness L* of the first skin color display portion in the CIE L*a*b* color space satisfies 20≦L*≦37,
the lightness L* of the second skin color display portion in the CIE L*a*b* color space satisfies 74≦L*≦81,
A skin color chart for judging the environment in which face authentication is performed.
[Claim 2]
The first and second skin color display parts are formed in a three-dimensional shape imitating a human face,
A skin color chart according to claim 1.
[Claim 3]
further comprising a plurality of gray display parts with different reflectances formed on the substrate,
The skin color chart according to claim 1 or 2.
[Claim 4]
further comprising a third skin color display section formed on the substrate and representing a skin color between the skin color of the first skin color display section and the skin color of the second skin color display section,
the lightness L* of the third skin color display portion in the CIE L*a*b* color space satisfies 62≦L*≦68,
A skin color chart according to any one of claims 1 to 3.
[Claim 5]
a fourth skin color display section representing a skin color between the skin color in the first skin color display section and the skin color in the third skin color display section;
and at least one of a fifth skin color display unit representing a skin color between the skin color in the second skin color display unit and the skin color in the third skin color display unit, further provided on the substrate,
The skin color chart according to claim 4.
[Claim 6]
the substrate is black,
A skin color chart according to any one of claims 1 to 5.
[Claim 7]
a step of forming on the substrate a first skin color display portion representing the Negroid skin color;
forming on the substrate a second skin color display portion representing a caucasian skin color,
the lightness L* of the first skin color display portion in the CIE L*a*b* color space satisfies 20≦L*≦37,
the lightness L* of the second skin color display portion in the CIE L*a*b* color space satisfies 74≦L*≦81,
A method for manufacturing a skin color chart for determining an environment in which face authentication is performed.
[Claim 8]
forming the first and second skin color display parts into a three-dimensional shape that imitates a human face,
The method for manufacturing the skin color chart according to claim 7.
[Claim 9]
further comprising the step of forming a plurality of gray display parts with different reflectances on the substrate,
9. The method for producing a skin color chart according to claim 7 or 8.
[Claim 10]
further comprising the step of forming on the substrate a third skin color display portion representing a skin color between the skin color of the first skin color display portion and the skin color of the second skin color display portion;
the lightness L* of the third skin color display portion in the CIE L*a*b* color space satisfies 62≦L*≦68,
A method for producing a skin color chart according to any one of claims 7 to 9.
[Claim 11]
a fourth skin color display section representing a skin color between the skin color in the first skin color display section and the skin color in the third skin color display section;
forming on the substrate at least one of a fifth skin color display portion representing a skin color between the skin color of the second skin color display portion and the skin color of the third skin color display portion; ,
11. The method for manufacturing the skin color chart according to claim 10.
[Claim 12]
the substrate is black,
A method for producing a skin color chart according to any one of claims 7 to 11.