JP2006333463A - Color characteristic verification system for eye, light source and color reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for more practically usefully, more easily and surely determining and verifying eye color sense difference and a correction method using printed matter based on CIE L*a*b* coloring even without apparatus measurements. <P>SOLUTION: Regarding a number of mosaic color charts of different color difference stages printed in cmyk while arraying a* on a lateral axis and b* on a longitudinal axis based on the CIE L*a*b* coloring, pure-color gradation color charts and complementary-color gradation color charts varying like gradations, color matching is performed using a determination criteria based on printing in Chinese ink or specific one color with an equal Lab value and different spectrum curves. A color matching position that becomes different in accordance with a conditional color matching phenomenon, is compared with an approximate standard position by a number of persons and a device determination position of a digital camera, a scanner or the like, color characteristics such as direction or extent of color slurring are determined from the difference of those positions, and a correction filter is detected and verified. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

Detailed Description of the Invention

  The present invention relates to a system for inspecting delicate color characteristics of a color reproduction device (device) such as an eye, light, a camera, a film, and a scanner and correcting the color shift.

In the past, there were Ishihara-style inspection tables, etc., but even if they can determine the large color characteristic difference of each eye, how much is shifted in which direction on the chromaticity diagram, individual It was not possible to examine the subtle difference in color vision of the eyes.
However, as a related method by the same applicant,
1) Japanese Patent Application No. 2002-307660
2) Japanese Patent Application No. 2002-313509
3) Japanese Patent Application No. 2002-272285
4) There is Japanese Patent Application No. 2005-154569.

Problems to be solved by the invention

  In the conventional method by the same applicant, the goal was to find the difference from the CIE standard value, so a huge number of chromaticity measurements with a colorimeter were indispensable for every chart part, so the unit price was very high and the user It was extremely limited, and there were not many instrumental measurement errors, which was a big problem.
  Also, because of the RGB chart, the color direction and the color difference stage are CIEL^*a^*b^*Color method (below) ^*(Omitted) The color difference method did not match and it was difficult to determine the ab color difference.
  Also, it is not possible to judge the color difference discrimination ability and the color feeling for each color in a list, how far the color difference judgment can be discriminated, and the verification method of whether the causal relationship and the selection of the correction filter are reliable. It was missing.
  An object of the present invention is to develop a method for improving the above-mentioned defects and enabling verification of the effects of the invention more efficiently, more inexpensively, easily, quickly and reliably.

Means for solving the problem

That is, the present invention relates to a method for detecting a color characteristic using a phenomenon of conditional color (metamerism),
1) For each main L value in the CIE Lab colorimetry, colorless (ab = 00) where the ab values are equal is in the center, and the a value is minus on the left, plus on the right in the equal chromaticity difference (equal ab value difference), Each data of a large number of ab digital color charts having different color difference steps such that the b value is increased up and down and the color difference is sequentially decreased from ab 25 difference to 1 difference is converted into three colors of cmy3 or cmyk4. A color chart printed in color, a colorimetric mask printed with a special color with a different Lab curve, but a Lab color value that matches the Lab value somewhere in the black plate and somewhere in the chart, a step density reference, a special color reference, etc. Chart position where the colors are equalized using the determination reference color (hereinafter referred to as reference color, achromatic (k) color).

2) On the CIE Lab chromaticity diagram (hereinafter referred to as chromaticity diagram), select the main pure color with the same L value and chromaticity difference, and achromatic between the multi-level pure color gradation chart row where each pure color is stepwise mixed with white (K) Equal lightness positions of both rows in a pure color gradation color chart created by alternately arranging multi-stage gradation rows of colors so as to intersect light and dark.
3) Using the achromatic (k) background as a background, select a primary pure color having the same chromaticity difference as the L value on the chromaticity diagram, and mix each color to include each complementary color pair, the reference color, and the approximate Lab value portion. Positions that are the same color as the background of a number of complementary color gradation color chart columns created as described above.
4) The achromatic (k) color density stage and a list created by arranging a number of cmy colors adjacent to each other on the CIELab chromaticity diagram in which the achromatic (k) color is different from the spectral curve but the Lab value is approximated. The position where colors are equalized on the color chart.

5) Collate the same color detection position with the multiple-person visual judgment position (approximate standard value) on the same chart, device color judgment position of digital camera, scanner, etc., CIE standard observer position device color judgment position by instrument measurement, etc. By comparing, it is possible to detect and verify color characteristics and color correction filter such as color characteristics, direction and degree of color misregistration, chromaticity difference discrimination ability among eyes, light source, color reproduction equipment (device) Color characteristics verification system for eye, light source, and color reproduction equipment.
By comparing the above-mentioned color matching detection positions with the multi-person visual determination position (approximate standard value), digital camera, scanner, etc. device color determination position, and CIE standard observer position by instrument measurement, This is solved by making it possible to detect color characteristics such as the direction and degree of color misregistration of the light source, the color reproduction device (device), the chromaticity difference discrimination ability, and the color correction filter on the chromaticity diagram.

(Color characteristic judgment principle)
Here, the determination principle of the color characteristic of the present invention will be described again.
The basic principle of the present invention is based on the application of conditional color matching (metamerism) phenomenon. That is, even if the spectral distributions of the two colors are different, if the total amount of the three primary colors RGB light entering the eye is equal and the CIE Lab values match, the two colors appear to be the same color, but the viewing conditions (when viewing) This is based on the fact that the color of the light fork looks different when the eye feels).
Here, the Lab values are the same, but the spectral distributions are different, and the gray or spot color ink portion of the halftone dot printing portion of one-color black (black k) ink and the three-color (cmy) or four-color (cmyk) ink having the same Lab value. A difference in color characteristics, a color difference discriminating force, and the like are determined from the difference in the color position, etc., generated between the parts.
Conditional color (metamerism) phenomena include illumination condition and observer condition color. Bringing a color swatch and bringing back colored paper that matches the colors, the colors appear to be different under the conditions of the illumination light, and the same two colors appear differently depending on the person under the same lighting conditions. Condition is the same color.

  Therefore, if a color with a different chromaticity difference is arranged in the CIEab chromaticity diagram in the vicinity of the standard observer's color that is the same color, and the color is equalized with one of them, the other color from the same color position. The difference in color perception and color characteristics of the light source and light source from the viewer, standard observer, and device can be determined on the chromaticity diagram from a chart with a large chromaticity difference, and a subtle difference from a chart with a small chromaticity difference. Probably based on the discovery of the first judgment principle in history. Note that the halftone dot printing portion of one-color black (black k) ink does not necessarily have a spectral distribution parallel to the horizontal axis, but the three-color (cmy) or four-color (cmyk) ink halftone printing portion with the same Lab value is Since the undulation has occurred, a condition color matching phenomenon occurs between the two colors, and the object can be sufficiently achieved by configuring the present invention.

  In other words, in the present invention, the problem that has been a conventional defect can be mass-produced at low cost by offset printing and inkjet printing, and the visual judgment result of a large number of people and the popular digital camera and scanner capture judgment value are approximated. By treating as a value, each spectroscopic instrument measurement can be omitted. In other words, even if each part of the chart is not individually measured with a colorimeter, practically sufficient inspection data can be obtained, and troubles such as measurement errors due to instrument measurement are eliminated.

Mosaic color charts are manufactured so that the ab color difference is equal according to the chromaticity diagram of the CIE Lab colorimetric method, and many charts, from charts with large color differences to charts with small color differences, can be used for cards, binders, books. The color difference discrimination ability can be inspected by the continuous inspection, and the charts are arranged at random in the standard position while keeping regularity to prevent the implied in the inspection. Care is taken to prevent implications.
In the present invention, in addition to the above-described method, the results determined by the above-mentioned method are well verified by gradation charts, list charts, etc., which are different embodiments, and the causal relationship of the determination results, and the correction effect of the correction filter It is considered to be able to confirm.

  In addition, since there is a difference in brightness between the determination reference colors, it is difficult to make the same color. For this reason, for example, a subtle density step in which the L value is incremented by one step is provided. By detecting the position where the colors are equal using the spot color reference equal to the X position of 1B, verification of the causal relationship of the difference in the color characteristics in the chromatic color can be made possible for the main hue.

The invention's effect

  As described above, the present invention cannot be known at all even if it is desired to know it so far, subtle differences in color vision that existed in the unknown world, and the color characteristics of color reproduction equipment are easier and more rigorous. As a result, the differences in color vision among races, ethnic groups, living spheres, and regions that have not yet been elucidated can be clearly identified, and the color vision characteristics become clear. It can be used for science, physiology, genetic research, etc., and in actual color management, whether the cause of color mismatch in the color matching is on the measuring instrument side, in the eye, or in the light In addition, by elucidating and eliminating the causes of countless troubles caused by the fact that mutual color sensation characteristics are unknown, it greatly contributes to the elucidation of unsolved color problems, such as dramatically improving color management. Teru it becomes possible.

  FIG. 1 is an example of an ab digital mosaic color chart that is the basis of the present invention. Reference numeral 1 denotes the mosaic color chart, and the horizontal axis and the vertical axis in computer image processing center around ab = 00. As shown in the figure, the ab ratio is changed in color in the plus and minus directions, and the chromaticity difference is arranged to increase as the distance from the center increases.

  In this state, CMY printing is performed so that the ab = 00 portion is colorless, and the color chart color portion is incorporated into the transparent portion 8 using the gray-based colorimetric mask 4 as a determination criterion in FIG. If the color portion matches the color portion, the color characteristic approximates to the CIE standard observer value, and the color shift from the C positive observer value increases as the equal color position moves away. . However, in this case, it is a majority determination position, a digital camera, and a scanner determination position, but it should be very close to the CIE observer position. However, they are to be solved by the present invention, and the accuracy is not yet known.

Note that the gray reference mask is considered to be selected from a multi-stage lightness mask that matches the color chart color by black printing, but it can be used quickly and easily by the multi-stage density step of FIG. Color is possible.
Further, as shown in FIGS. 5 and 6, each page of the mosaic color chart includes an achromatic color stage (so-called gray scale stage) from white to black as shown by halftone printing of one color black (black k) ink. Parallel columns and three-color (cmy) or four-color (cmyk) ink dot printing stages with equal Lab values so that they can determine how the color difference occurs with the eye and with the device This makes it possible to determine without assigning a colorimetric mask or density level, and as shown in 4 of FIG. 1, the same gray reference as in FIG. Simultaneously adjust the density and contrast at the same time, and provide the digital image as a reference standard for finding the color matching position of the mosaic color chart. To have.

  At the same time, the mosaic color chart provides multi-level basic ab digital data and mosaic color chart so that the color difference becomes half as small as about 50 or 25 differences, and the same color is recommended from the side with large color difference. By performing the inspection up to the point where the judgment becomes difficult, it is possible to inspect how much the chromaticity difference can be clarified within a considerably wide range by the ab difference.

  In the actual mosaic color chart printing of the present invention, the ab position is intentionally shifted, and numbers and symbols not related to the b value are given, and the colorimetric masks of FIG. 2 and the density step of FIG. After the colors are equalized, the numbers and symbols of the ab chart are read and applied to another figure, so that the impliment can be prevented so that the actual digital ab color difference can be determined.

  In the CIE chromaticity diagram for determination shown in another figure, the ab color difference from the colorless position can be determined by applying the horizontal axis and vertical axis data of the chart, and the direction and degree of color shift of the eye, the light source, and the color reproduction device can be determined. At the same time, the color correction data for correcting the ab value difference is displayed side by side to obtain color correction data. There, the color correction filter can be made directly readable.

  For example, when the colors are equalized at f-6, if they are applied to another figure and the ab value is read, it is found that the level is shifted in the blue direction by one step at the lower left of the standard and about 10 for both ab. When an approximate value is searched for, it is possible to detect a correction filter such that 30C (cyan 30) is closest to a = −12 and b = −9.

  Here is a supplementary explanation of the relationship between the inspection position and the correction filter. For example, the eye shifted to 30C is shifted to the blue side like the same camera and scanner device, so it seems that it seems more and more bluish. However, when the standard is viewed from the blue side, the standard appears to be reddish on the contrary, so the correction filter is definitely 30 of cyan. Moreover, the reason why only the C filter is close to the zero point at the same density is that a mixture of three colors of the same density of CMY does not become an achromatic color, and it requires more C than YM to produce an achromatic color even in printing. Can also be understood.

  However, the positions and numerical values shown in the chromaticity diagram are data of an ab digital chart as a matrix, and actually, the data is converted into CMYK data and printed to cause color misregistration. Therefore, in the past, it was necessary to perform a great work of actually measuring all the innumerable printed parts including the zero point. This was a big barrier that could not be spread.

  However, in the present invention, a method has been developed that enables mass production at low cost by printing, while allowing chromaticity measurement by each colorimeter to be omitted almost without any problem. The method is to treat the inspection results of a large number of people, the prevailing digital camera positions, and scanner capture judgment values as approximate standard values, which makes it practically very effective with charts without instrument measurement. Color vision test data can be obtained.

  That is, all the color measuring instruments are measured based on CIE standard observer data, but in the present invention, a large number of eyes are regarded as a large number of visual sensation determination devices, and examination data determined by a large number of persons is used as an approximate standard. Adopt the idea. In this way, it is possible to obtain a test result more desirable than instrument measurement in practical use, which is more reliable than instrument, without the disadvantages of instrument measurement such as individual differences between devices and determination errors. This is because, in general, it is more important to match the color standard with everyday companions and good color management personnel than the CIE standard, and the absolute value of CIE is not always required. Because there is no.

  In addition, color vision determination is related to privacy, and there are many cases where self-diagnosis is desired. For this purpose, in the present invention, the same conditions are photographed with a digital camera together with a colorimetric mask with the same illumination, or captured together with a colorimetric mask with a scanner that has already become widespread like a camera and matches the gray portion of the colorimetric mask of the digital image. Alternatively, if an approximated part is found and this is used as an approximate standard and the position is shifted to the ab = 00 position in the ab chromaticity diagram as it is, the positional relationship of the determination result is transferred as it is, and the color deviation from the CIE standard is described above. The color difference discrimination power can be inspected fairly accurately. That is, the biggest problem of the prior art is solved by the technical idea that the practical value is given priority and the absolute value may be obtained separately.

FIG. 4 is a pure color pure color gradation color chart according to the second embodiment. In the chromaticity diagram, a main pure color having the same chromaticity difference as the L value is selected, and a multi-step pure color gradation in which each pure color is stepwise mixed with white. An achromatic (k) multi-stage gradation column 15 is alternately sandwiched between the chart columns 14 so that light and dark intersect, and the multi-stage pure color gradation chart column is, for example, ab color from a to h The main pure color columns are arranged clockwise from the lower right of the degree map. Reference numeral 13 denotes a lightness number on the vertical axis, which determines and displays an equal lightness position.
Since the 14th and 15th rows are alternately arranged, there is a portion where the darkness and darkness coincide with each other. Since it becomes clear in which direction and how much it is shifted on the ab chromaticity diagram depending on the position, the determination can be made easily and quickly. The lightness and darkness of each main pure color is found, and this can be further examined with a mosaic chart.

FIG. 5 is a complementary color gradation color chart as a third method. With the achromatic (k) background, main pure colors having the same L value and chromaticity difference are selected on the chromaticity diagram, and each complementary color is selected. The colors are mixed to include the pair, the achromatic (k) color, and the approximate Lab value portion.
In the figure, 16 is the background of the achromatic (k) color, 17 is the main pure color position at one end, 18 is each complementary color position on the chromaticity diagram of the main pure color at the other end, Since the colors are mixed so that the background color and the approximate Lab value portion are included, each column has the same color somewhere in the background color. However, since the position differs for each eye, light, and device, the direction and degree of color misregistration can be determined by detecting the same color position. By adding a complementary color pair of RGB and CMY to this complementary color gradation chart, RGB color misregistration can be determined.

  The judgment graph in which the lightness position by the second method and the color matching position by the third method are plotted on the transparent film makes it clear at a glance that the color characteristics of the eye, light source, and color reproduction device are obvious. The causal relationship with the mosaic test can be verified, and the filter effect can be easily verified.

  FIG. 3 shows an embodiment of a reference color multi-stage density stage step used in place of the colorimetric mask, in which 9 is the achromatic (k) color density stage step and 10 is the L value equal to the L value of the mosaic chart. The reference color density portion of the value, the intermediate brightness L52 is shown in the figure, and the density level is changed by the L1 level difference on the left and right. Therefore, the use of this step can eliminate the problems of color incompatibility due to lightness difference and misjudgment, and quicker, easier and more reliable color matching than a colorimetric mask.

Further, as a fourth method, the achromatic (k) color density stage and a large number of cmy colors on the chromaticity diagram in which the achromatic (k) color and the spectral curve are different but approximate to the Lab value are arranged adjacent to each other. By using a list color chart that has been created, the direction and extent of color shift can be detected in the list.
As described above, in the present invention, the difference in relative color sensation can be made easier, more reliable, and less expensive than the conventional color measurement without necessarily measuring the instrument color, and even if the eye cannot be compared with the CIE standard, at least the eye is positioned at the majority position. It can be verified on the chromaticity diagram along with the color difference discrimination power, and how much color misalignment occurs in which direction if there is a color misregistration, and how to adjust to correct the color misregistration It will be possible to make a thorough judgment as to what to do.

  For example, regarding the determination accuracy, in the second to fourth methods and this figure, for example, when the sensitivity is high in the Y direction, the mosaic chart is shifted in the Y direction (upward in the ab chromaticity diagram). It is possible to verify whether the correction filter is effective and to verify whether the correction filter is effective by applying a filter to the lens system, avoiding misjudgment and making it quite true It is possible to obtain a close determination result.

  The color correction method can be determined using a color correction filter for the eyes and devices. When the position of the inspection result is different from the majority position, the filter that matches the majority approximate position when the CMY, RGB color correction (CC) filter is applied to the eye makes the color sense equal to the majority. It is a correction filter. In the present invention, since determination is made using a mosaic and a gradation chart, the causality can be verified with high reliability.

Further, the color misregistration for the main hue can be inspected for each color by using a special color standard such as a special color ink that does not have a CMY color mixing system and the Lab color value matches the mosaic color chart. The causal relationship with the data obtained by the first method as a standard becomes clear.
That is, it is possible to verify in which direction the chromatic colors other than colorless (ab = 00) are shifted on the mosaic chart as a deviation at the colorless position. Probably in the same direction. By adding this method, it will be possible to perform highly accurate color vision inspection, light source determination, and device color characteristic determination verification.

(Judgment of light source color)
In the present invention, the above color management includes the standard light source, for example, AAA5000k color evaluation fluorescent lamp, lighting conditions such as similar indoor natural light after noon, and the determiner is a multi-person position person. In the light source determination, if the determination position is the same, it is understood that the light source is suitable as a determination light source. If it is not suitable, the mosaic, pure color gradation color chart, and complementary color gradation chart are also equal in color at the shifted position, so that it is possible to determine the color quality of the light source as to whether it is suitable for color management. In addition, the color characteristics of color reproduction devices such as a silver salt color film, a digital camera, and a scanner can be similarly determined, and can be determined much more easily and cheaply and reliably.

  In the present invention, in the above-described method, various color portions that are the same color as the various light sources are cut out or printed, and the color temperature of the light source is determined from the position where they are equalized in parallel with the black and white gray reference. It is also possible to easily provide a light source color inspection form that can be found. For example, as in FIG. 5, if the position where both ends of the color temperature trajectory, or both the G system and M system for fluorescent lamps are equalized, for example, with a standard of 5000k, is set in the center, the color temperature system is displayed at the standard observer. And GM light color determination.

(Determination of device color)
In the case of a color film or a digital camera, the difference in color is naturally found by comparing the result of photographing with appropriate exposure using a designated light source with the eyes or other devices.
For example, even if the eye sees the 5th and 6th rows in FIG. 1 in an approximate manner, a certain camera may be bluish and a certain film may be reddish. This is a difference due to the spectral sensitivity of the device, the characteristics of the dye, and the image processing method, and together with the difference in color characteristics with the eye, the problem of whether the color does not match can be solved in the light or in the eye, It is possible to verify with a multi-color chart the determination of what filter should be used for photographing similar to visual perception.
Since the image processing software can determine the Lab value, therefore, it can determine the Lab characteristic color value of each device, and together with the device determination, the color characteristic of the eye can be determined as a reference. In other words, it is possible to determine the actual color feeling of the eye with high accuracy without using an expensive spectrophotometric device.
(Monitor adjustment)
In the present invention, the digital ab color chart is called up on the monitor screen, and the mosaic color chart illuminated with a 5000k fluorescent lamp for AAA color evaluation as a standard light source is placed, and the monitor image matches the impression with the color chart. Therefore, correct monitor adjustment, which has been difficult in the past, can be easily and reliably performed.

(Adjusting the output image from the monitor)
In the present invention, at each brightness level, the ab color chart is called on the monitor screen and proof-printed as it is, and the gray colorimetric colorimetric mask is printed on the chart portion printed under the standard light source for AAA color evaluation 5000k fluorescent lamp. If the ab value is adjusted in the Lab mode, it is possible to easily and surely find a color correction value as to how the colorless portion of the monitor is gray-balanced colorless.

  Color science and technology has been greatly developed and advanced, and most of the color characteristics of light and color materials have been elucidated, but the subtle color characteristics of the eye have so far been in the black box. The reason is that there was no means that could be easily obtained even if one wanted to know, but the present invention may already be as described above, and the individual subtleties and vast differences may be greatly different. Unexplained color sensation can be solved with high accuracy by means of a card system that does not require device measurement by printing, and it is easy and easy to make your own color sensation and light, and color characteristics of digital cameras, scanners, films, etc. Because it is possible to know at a low cost, it can contribute to solving problems caused by differences in the color sensation actually occurring in all fields dealing with colors, as well as color reproduction, understanding and dissemination of CIE colorimetry, It can greatly contribute to the improvement of color education and color culture.

Explanatory drawing of one Example of ab digital mosaic color chart. Explanatory drawing of one Example of the colorimetric mask of a gray reference | standard. Example of achromatic (k) color multi-level density step. Pure color gradient color chart Complementary color gradation chart

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ab digital mosaic color chart 1B Example of equal Lab value position to make same color with special color reference 2 Symbol indicating position in a-axis direction of color chart 3 Number indicating position in b-axis direction of color chart 4 Reference color density step 5 Gray scale stage for printing four colors of cmyk 6 (k) Gray scale stage for printing with one black ink 7 Colorimetric mask 8 Colorimetric window (punching hole)
9 Achromatic (k) color density step 10 Achromatic (k) color density portion of L value equal to L value of mosaic chart 11 Display of L value 12 Multi-level pure color gradation chart row and its symbol 13 Brightness number of vertical axis 14 Multi-level pure color gradation chart row in which pure color is mixed with white in stages 15 Achromatic (k) color multi-step gradation row 16 Achromatic (k) color background 17 Major pure color position at one end 18 Major at the other end Each complementary color position on the chromaticity diagram of pure color,

Claims (1)

In a method for detecting color characteristics using a conditional color (metamerism) phenomenon,
1) For each main L value in the CIE L ^* a ^* b ^* colorimetric method ( ^* is omitted), a colorless value (ab = 00) having the same ab value is the center, and the a value is the same color difference (equal ab value difference). Each of a number of ab digital color charts having different color difference stages so that the color difference gradually decreases from ab25 difference to 1 difference, so that the color difference is ab25 difference to 1 difference. For color charts of several levels printed with CMY3 or CMYK4 colors after data conversion, one color of the black plate and a colorimetric color printed with a spot color that matches the Lab value somewhere in the chart but with a different curve A chart position where colors are equalized using a determination reference color (hereinafter referred to as a reference color, achromatic (k) color) such as a mask, a step density reference, and a special color reference.
2) A primary pure color having the same L value and chromaticity difference is selected on the CIE Lab chromaticity diagram, and a multi-step achromatic (k) color is provided between the multi-step pure color gradation chart row in which each pure color is stepwise mixed with white. Equal lightness positions of both rows in a pure color gradation color chart created by alternately arranging gradation rows so that light and dark intersect.
3) With the background of the achromatic (k) color, select a main pure color having the same chromaticity difference as the L value on the CIE Lab chromaticity diagram, and select each complementary color pair, the achromatic (k) color and the approximate Lab value. Positions that are the same color as the background of many complementary color gradation color chart columns created by mixing colors to include the part.
4) List color created by arranging a number of cmy colors adjacent to each other on the CIELab chromaticity diagram in which the achromatic (k) color density stage is different from the achromatic (k) color and the spectral curve is similar but the Lab value is approximated. The position where the colors are equal in the chart.
The color matching positions that differ depending on the condition color matching phenomenon are the multiple person visual determination position (approximate standard value) of the same chart, the device color determination position of a digital camera, a scanner, etc., and the CIE standard observer position by instrument measurement. By comparing the above, color characteristics such as the direction and degree of color misregistration of the eye, light source, and color reproduction device (device), chromaticity difference discrimination ability, and color correction filter detection can be detected on the CIE Lab chromaticity diagram. Color characteristics verification system for eyes, light sources, and color reproduction equipment.