JP2010133728A - Sheet for color reproduction determination test, method for manufacturing the same, and color reproduction determination test method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet for a color reproduction determination test capable of determining color reproduction on a determination object printed matter by a simple constitution, and to provide a method for manufacturing the sheet, and a color reproduction determination test method. <P>SOLUTION: This sheet for the color reproduction determination test for determining color reproduction on the determination object printed matter which is a determination object for color reproduction includes a test piece obtained by piling the determination object printed matter on a first reference printed matter which is a determination reference and on a second reference printed matter which is a determination reference having a different color reproduction range from the first reference printed matter so that the determination object printed matter is used as a print surface, a first reference piece obtained by piling the first reference printed matter on the determination object printed matter and on the second reference printed matter so that the first reference printed matter is used as a print surface, and a second reference piece obtained by piling the second reference printed matter on the determination object printed matter and on the first reference printed matter so that the second reference printed matter is used as a print surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a color reproduction determination test sheet and a color for determining the color reproduction of a determination target printing material with a simple configuration against the difference in color reproduction caused by the difference in the printing material such as printing paper and printing film. It belongs to a technical field such as a reproduction determination test method.

  Currently, there are various printing materials such as printing papers and printing films, but there are printing papers in which the surface of the printing paper is smoothly coated with a paint or a white pigment to improve ink acceptability during printing.

  It is known that the larger the amount of paint or white pigment applied to the paper surface, the richer the color reproduction, in other words, the wider color reproducibility. It is also known that the higher the specific gravity (density) of paper, the wider the color reproducibility.

  On the other hand, art paper, coated paper, matte paper, and high-quality paper with different coating amounts of paint and white pigment on the surface of printing paper are defined as Japan color standard paper.

Whether the color reproduction of a certain printing paper (printing object to be judged) is classified as one of these color standards, with the above art paper, coated paper, matte paper, and high-quality paper as reference printing materials to be judged As a determination method, there is a method of determining the color reproduction of the printing paper by simulating by DDCP (Direct Digital Color Proofing) based on the coating amount, texture, and the like.
JP 2006-57230 A JP 2007-10028 A JP 2005-213698 A JP 2006-121124 A

  However, in recent years, paper manufacturers have tried to reduce the weight and improve portability by using printing paper that is bulky (low density) and can produce a wide range of color reproduction even when the amount of paint or white pigment applied to the paper surface is small. Many have been developed (see Patent Documents 1, 2, and 3).

  Such newly developed printing papers with high bulk and low coating amount exist from those that can obtain a wide color reproduction equivalent to coated paper depending on the brand, to those that exhibit a narrow color reproduction similar to fine paper, It is difficult to simulate color reproduction by DDCP from the amount of coating, texture, density, and the like.

  Furthermore, for such color reproduction simulation in DDCP, a technique for improving accuracy and a technique for reducing the measurement load have been developed (see Patent Document 4). Even when such a technique is used, actual printing is performed. Using paper (the target print to be judged and the reference print to be judged (coated paper, etc.)), test print a color chart, etc., combining CMYK in stages, using a flatbed calibrator or this machine. It must be colored, and it takes time to prepare for printing such as making a plate.

  Furthermore, when printing and colorimetrically determining the target substrate and coated paper, they must be printed under the same printing conditions. However, when the printed material is actually printed, There is also a problem that errors such as pressure, nip setting, ink deposit amount, etc. occur, and the color reproduction range of each printed matter fluctuates, so that an accurate simulation cannot be performed.

  The present invention has been made in view of such problems, and with a simple configuration, a color reproduction determination test sheet capable of determining and predicting color reproduction of a determination target print, a method for manufacturing the same, and An object is to provide a color reproduction determination test method.

  In order to solve the above problems, the invention according to claim 1 is a color reproduction determination test sheet for determining color reproduction of a determination target printed material (e.g., paper / film) that is a color reproduction determination target. A color reproduction range that is different from the first reference substrate (for example, high-quality paper) serving as a criterion for determination and the first reference substrate so that the determination target substrate is a printing surface. A test piece superimposed on a second reference substrate (eg, coated paper, art paper, etc.) serving as a criterion for determination, and the first reference substrate so that the first reference substrate is a printing surface. The first reference piece obtained by superimposing the printed material on the determination target printed material and the second reference printed material, and the determination of the second reference printed material so that the second reference printed material becomes a printing surface. Overlying the target substrate and the first reference substrate And the second reference piece suit, a sheet for color reproduction determination test, characterized in that it comprises a.

  According to this, the test piece in which the determination target printing material is the printing surface, the first reference piece in which the color reproduction range is known and the first reference printing material serving as the determination reference is the printing surface, and the color reproduction range Since the second reference piece on which the second reference substrate to be used for determination is the printing surface is made to have the same thickness, the determination is made by printing the color reproduction determination test sheet. It is possible to develop (print) ink on the target substrate, the first reference substrate, and the second reference substrate simultaneously and at the same pressure, and perform an accurate color reproduction determination test with a simple configuration. A color reproduction determination test sheet that can be performed can be provided.

  In order to solve the above problem, the invention according to claim 2 is the color reproduction determination test sheet according to claim 1, wherein the first reference printed material is any one of coated paper, matte paper, and fine paper. The second reference printed material is a color reproduction determination test sheet, which is one of art paper, coated paper, and matte paper.

  According to this, any one of coated paper, matte paper, and high-quality paper is used as the first reference substrate, and art paper, coated paper, and matte paper that have a relatively large color standard from the coated paper, matte paper, and high-quality paper. Since either one is the second reference substrate, the color reproduction of the determination target substrate is changed from any color reproduction of coated paper, matte paper or fine paper to any color of art paper, coated paper or matte paper. Comparison can be made within the range of reproduction.

  In order to solve the above problem, the invention according to claim 3 is a method for manufacturing a color reproduction determination test sheet for determining color reproduction of a determination target printed material that is a color reproduction determination target. The second reference serving as a determination reference having a color reproduction range different from the first reference printed material serving as the determination reference and the first reference print printed matter as the determination reference so that the printed material becomes the printing surface. A test piece creation step for creating a test piece superimposed on the print substrate, and the first reference print substrate, the determination target print substrate and the second reference so that the first reference print substrate becomes a printing surface. A first reference piece creating step for creating a first reference piece superimposed on the printed material; and the second reference printed material and the determination target printed material so that the second reference printed material becomes a printing surface. Superimposing on the first reference substrate And the second reference piece generation step of generating a second reference piece was a color reproduction determination test sheet manufacturing method characterized in that it comprises a.

  According to this, the test piece in which the determination target printing material is the printing surface, the first reference piece in which the color reproduction range is known and the first reference printing material serving as the determination reference is the printing surface, and the color reproduction range The color reproduction determination test sheet was produced by making the second reference piece having the same thickness as the second reference piece whose printing surface is the second reference substrate that is known and used as a criterion for determination. By printing the sheet, the ink can be developed (printed) at the same time and at the same pressure on the determination target substrate, the first reference substrate, and the second reference substrate, with a simple configuration. A color reproduction determination test sheet capable of performing an accurate color reproduction determination test can be provided.

  In order to solve the above-mentioned problem, the invention according to claim 4 is the method for manufacturing a sheet for color reproduction determination test according to claim 3, wherein the determination target printed material, the first reference printed material, and the second reference material. Each of the reference printed materials is cut out to create a plurality of division determination target printed materials, divided first reference printed materials, and divided second reference printed materials, and the test piece creating step includes the first A test piece is created by superimposing the division determination target print on the first divided first reference print and the first divided second reference print, and the first reference piece creation step includes The divided first reference substrate is overlapped on the second divided determination target substrate and the second divided first reference substrate to create a first reference piece, and the second reference piece creation step Is the third divided second reference substrate, The division determination object to be printed material 3 and the third the divided first reference color reproduction determination test sheet manufacturing method, wherein the creating the second reference piece superimposed on the substrate of the.

  According to this, the division determination target printing material, which is originally cut out (divided) from the same determination target printing material, which is one printed material, the first reference printing material, and the second reference printing material, is divided first. Since the test piece, the first reference piece, and the second reference piece were created using the reference printed material and the divided second reference printed material, the test piece, the first reference piece were not affected by the individual difference of each printed material. The first reference piece and the second reference piece can be created under the same conditions (such as uniform thickness).

  In order to solve the above-mentioned problem, the invention according to claim 5 is the method for producing a sheet for color reproduction determination test according to claim 3 or 4, wherein the first reference printed material is coated paper or matte paper. In the method of manufacturing a color reproduction determination test sheet, the second reference printed material is any one of high-quality paper and the second reference printed material is any one of art paper, coated paper, and matte paper.

  According to this, any one of coated paper, matte paper, and high-quality paper is used as the first reference substrate, and art paper, coated paper, and matte paper that have a relatively large color standard from the coated paper, matte paper, and high-quality paper. Since either one is the second reference substrate, the color reproduction of the determination target substrate is changed from any color reproduction of coated paper, matte paper or fine paper to any color of art paper, coated paper or matte paper. Comparison can be made within the range of reproduction.

  In order to solve the above-mentioned problem, the invention according to claim 6 is the color reproduction determination test method using the color reproduction determination test sheet according to claim 1 or 2, wherein the color reproduction determination test sheet is provided on the color reproduction determination test sheet. And a color reproduction determination test method characterized by having a color developing step for developing ink.

  According to this, ink can be simultaneously developed (printed) on the test piece, the first reference piece, and the second reference piece on the color reproduction judgment test sheet, and an accurate color reproduction judgment test can be performed with a simple configuration. Can be performed.

  In order to solve the above-mentioned problem, the invention according to claim 7 is the color reproduction determination test method according to claim 6, wherein the color developing step includes a color developing device that tests and evaluates the printability of the printing material and ink. The color reproduction determination test method is characterized in that the ink is simultaneously developed on the test piece, the first reference piece, and the second reference piece.

  According to this, it is possible to uniformly transfer (color develop) the ink onto the color reproduction determination test sheet using the color developing device.

  In order to solve the above-mentioned problem, the invention according to claim 8 is the color reproduction determination test method according to claim 6 or claim 7, wherein the test piece, the first reference piece, and the second reference piece are respectively provided. A colorimetric process for color measurement at multiple locations, an average value of density, lightness, or saturation at multiple locations on the test piece, and an average value of density, lightness, or saturation at multiple locations on the first reference piece, In the color reproduction determination test method, the color reproduction determination is performed by comparing at least any two of the average value of density, lightness, and saturation at a plurality of locations of the second reference piece.

  According to this, a test piece, a 1st reference piece, and a 2nd reference piece are color-measured, the determination target printed material of a test piece, the 1st reference printed material of a 1st reference piece, and the 2nd of a 2nd reference piece. Since the density, brightness, or saturation of the reference printing material is measured, the color reproduction of the determination target printing material is specifically compared with the color reproduction of the first reference printing material and / or the second reference printing material numerical value. can do. In addition, since the test piece, the first reference piece, and the second reference piece are measured at a plurality of locations and compared using the average value, the determination accuracy can be improved.

In order to solve the above problem, the invention according to claim 9 is the color reproduction determination test method according to claim 8, wherein the average value of the density of the test piece is Ds and the average value of the density of the first reference piece. Is a predetermined value Dn, which is a value obtained by normalizing the average value of the concentration of the test piece using the following formula 1. Based on the predetermined threshold for density, the color reproduction of the determination target print belongs to the color reproduction range of the first reference print, the color reproduction range of the second reference print, or the A color reproduction determination test method for determining whether a color reproduction range is defined between a color reproduction range of a first reference substrate and a color reproduction range of the second reference substrate.
Dn = (Ds−Dr1) / (Dr2−Dr1) × 100 (Formula 1)

  According to this, the color reproduction of the determination target printing material based on the measured density of the determination target printing material, the first reference printing material, and the second reference printing material, and the predetermined density threshold value. Can be determined.

In order to solve the above-mentioned problem, the invention according to claim 10 is the color reproduction determination test method according to claim 8, wherein the average value of the lightness of the test piece is Ls, and the average value of the lightness of the first reference piece. Is Lr1, and the average brightness value of the second reference piece is Lr2, Ln, which is a value obtained by normalizing the average brightness value of the test piece using Equation 2 below, is determined in advance. On the basis of the predetermined threshold value for brightness, the color reproduction of the determination target printing material belongs to the color reproduction range of the first reference printing material, the color reproduction range of the second reference printing material, or the A color reproduction determination test method for determining whether a color reproduction range is defined between a color reproduction range of a first reference substrate and a color reproduction range of the second reference substrate.
Ln = (Ls−Lr1) / (Lr2−Lr1) × 100 (Expression 2)

  According to this, the color reproduction of the determination target printing material is performed based on the measured brightness of the determination target printing material, the first reference printing material, and the second reference printing material, and the predetermined threshold value for brightness. Can be determined.

  In order to solve the above problem, the invention according to claim 11 is the color reproduction determination test method according to claim 9, wherein the first reference substrate is high-quality paper and the second reference substrate is coated paper. In the case where the predetermined threshold value for density is 25 and 7, and the value Dn obtained by normalizing the average value of the density of the test piece is 25 or more, When the color reproduction is determined to belong to the color reproduction range of the second reference substrate, and the value Dn obtained by normalizing the average value of the density of the test piece is less than 25 and 7 or more, It is determined that the color reproduction of the determination target substrate belongs to a color reproduction range defined between the color reproduction range of the first reference substrate and the color reproduction range of the second reference substrate, When the value Dn obtained by normalizing the average value of the density is less than 7 , Color reproduction of the determination target printing object is a color reproduction determination test method and determines that belong to the color reproduction range of the first reference the substrate.

  According to this, by comparing the value Dn obtained by normalizing the average value of the density of the determination target print with the predetermined threshold values for density 25 and 7, the determination target print is determined. It is possible to determine whether the color reproduction belongs to the color reproduction range of the fine paper, the color reproduction range of the coated paper, or the color reproduction range defined between the fine paper and the coated paper. it can.

  In order to solve the above problem, the invention according to claim 12 is the color reproduction determination test method according to claim 10, wherein the first reference substrate is high-quality paper, and the second reference substrate is coated paper. When the predetermined threshold value for lightness is 35 and 10, and the value Ln obtained by normalizing the average value of lightness of the test pieces is 35 or more, When color reproduction is determined to belong to the color reproduction range of the second reference substrate, and the value Ln obtained by normalizing the average value of the brightness of the test piece is less than 35 and 10 or more, It is determined that the color reproduction of the determination target substrate belongs to a color reproduction range defined between the color reproduction range of the first reference substrate and the color reproduction range of the second reference substrate, The value Ln obtained by normalizing the average value of brightness is less than 10. In this case, the color reproducibility of the determination target printing object is a color reproduction determination test method and determines that belong to the color reproduction range of the first reference the substrate.

  According to this, by comparing the value Ln obtained by normalizing the average value of the lightness of the determination target printing material with the predetermined threshold values 35 and 10 for lightness, the determination determination target printing material. To determine whether the color reproduction belongs to the color reproduction range of fine paper, the color reproduction range of coated paper, or the color reproduction range defined between fine paper and coated paper Can do.

  According to the present invention, ink can be developed (printed) at the same time and at the same pressure on the determination target substrate, the first reference substrate, and the second reference substrate, and an accurate color can be obtained with a simple configuration. A color reproduction determination test sheet capable of performing a reproduction determination test, a manufacturing method thereof, and a color reproduction determination test method can be provided.

  Preferred embodiments of a color reproduction determination test sheet, a manufacturing method thereof, and a color reproduction determination test method of the present invention will be described below with reference to the accompanying drawings.

<1. Color reproduction determination test sheet and manufacturing method thereof>
First, the color reproduction determination test sheet of the present invention will be described with reference to FIGS.

  FIG. 1 is a plan view of a color reproduction determination test sheet 100 in the present embodiment, FIG. 2 is an explanatory view of a method for manufacturing the color reproduction determination test sheet 100, and FIG. 3 is a cross-sectional view taken along line AA in FIG. It is.

  As shown in FIG. 1, a color reproduction determination test sheet 100 according to the present embodiment includes a mount 10, a test piece 1, and reference pieces 2a and 2b.

  The test piece 1 is affixed to the mount 10 with a tape or the like, and the reference pieces 2a (an example of the first reference piece) and 2b (an example of the second reference piece) are also mounted on the mount 10 in the same manner as the test piece 1. Affixed with tape or the like.

  The test piece 1 is configured such that a determination target printed material (hereinafter referred to as “sample”) that is a determination target of color reproduction is a printing surface (front side in FIG. 1) of the color reproduction determination test sheet 100. The reference piece 2a is configured such that the first reference substrate to be used as a reference for determination is the printing surface of the color reproduction determination test sheet 100, and the reference piece 3a is used as a reference for determination. The second reference printed material is configured to be a printing surface of the color reproduction determination test sheet 100.

  As the reference printed material to be used as a determination criterion, for example, a paper having a known color reproduction range (color standard) such as a Japan color standard paper is used.

  Further, in order to compare the sample with two reference prints, two types of reference prints having different color reproduction ranges are used as the first reference print and the second reference print. The paper used for the first reference substrate and the second reference substrate may be any paper that has a known color reproduction range and a different color reproduction range. For example, art paper, coated paper, matte paper Use fine paper.

  Since the color reproduction range becomes narrower (smaller) in the order of art paper> coated paper> matte paper >> high quality paper, any one of coated paper, matte paper, and high quality paper is used as the first reference substrate. It is more preferable to use any of art paper, coated paper, and matte paper as the second reference substrate. In the present embodiment, an example will be described in which high-quality paper is used as the first reference substrate and coated paper is used as the second reference substrate.

  Hereinafter, a method for manufacturing the color reproduction determination test sheet 100 will be described.

  The test piece 1 and the reference pieces 2a and 2b are composed of a single sample, a high-quality paper, a sample obtained by cutting a single coated paper into a plurality of pieces, a high-quality paper, and a coated paper (division judgment target printed material, 1 reference printed material and an example of a divided second reference printed material).

  Specifically, as shown in FIG. 2, the test piece 1 includes a sample (one-dot chain line) cut from one sample, a high-quality paper (solid line) cut from one high-quality paper, and one sheet. It is created by overlaying on the coated paper (dotted line) cut out from the coated paper.

  The reference piece 2a is obtained by cutting a high-quality paper (solid line) cut out from one high-quality paper into a sample (one-dot chain line) cut out from one sample and a coated paper (dotted line) cut out from one coated paper. ).

  The reference piece 2b includes a coated paper (dotted line) cut from one coated paper, a sample (dotted line) cut from one sample, and a high quality paper (solid line) cut from one quality paper. ).

  Such a test piece 1 and reference pieces 2a and 2b are affixed on the mount 10, and the color reproduction determination test sheet 100 is manufactured.

  Since the test piece 1 and the reference pieces 2a and 2b of the color reproduction determination test sheet 100 thus manufactured have the same thickness as shown in the cross-sectional view of FIG. 3, the color reproduction determination test sheet 100 is used. When the ink is developed, the printing pressure is uniformly applied to the sample which is the printing surface of the test piece 1, the high quality paper which is the printing surface of the reference piece 2a, and the coated paper which is the printing surface of the reference piece 2b. be able to.

  Hereinafter, “a specific example of manufacturing the color reproduction determination test sheet 100” will be described.

  Prepare the following sheets [1] to [3] of about 10 cm × 20 cm.

[1] Sample,
[2] High-quality paper (sixth edition / 70 kg or more (81.4 g / m ^ 2 or more), for example, OK Prince fine quality (manufactured by Oji Paper Co., Ltd.), Shiraoi fine quality (manufactured by Nippon Paper Industries)
[3] A2 coated paper (46 plates / 70 kg or more (81.4 g / m ^ 2 or more)), for example, OK Top Coat Plus (manufactured by Oji Paper Co., Ltd.), Aurora Coat (manufactured by Nippon Paper Industries Co., Ltd.)

  Each sheet of [1] to [3] is cut to a width of 2 cm, and the three sheets are overlapped as described with reference to FIG. 2 to create the test piece 1 and the reference pieces 2a and 2b.

  The prepared test piece 1 and reference pieces 2a and 2b are affixed to the mount 10 using a tape or the like to produce a color reproduction determination test sheet 100.

<2. Color reproduction test method>
Next, the color reproduction determination test method of the present invention will be described using FIG.

  By developing a predetermined ink on the color reproduction determination test sheet 100 manufactured by the above-described method and observing the test piece 1 and the reference pieces 2a and 2b, the color reproduction of the sample can be performed on high-quality paper, coat Determine which color reproduction of the paper belongs to.

  The color development is performed using any one of indigo (C), red (M), yellow (Y), and black (K) ink, but black (K) ink is preferably used.

  In addition, when the ink is developed, it is preferable to use a color developing device that tests and evaluates the printability of the printing material and the ink. The color developing device is a device that kneads the ink with two rollers and spreads it uniformly, and then transfers the ink to the printing material at a constant pressure and a constant speed. For example, a commercially available printing proper device (IR tester) or the like is used. Can be used.

  In the case of the color reproduction determination test sheet 100 described in the above “specific example of color reproduction determination test sheet 100”, 0.125 cc of black (K) ink measured with a pipette is used as a commercially available printing appropriate device ( The ink is developed using a 1/2 cut rubber roller by an IR tester or the like. The color developing device generally includes a ½ cut or ¼ cut rubber roller. However, in the present embodiment, the test piece 1 and the reference pieces 2 a and 2 b on the color reproduction determination test sheet 100 are simultaneously provided. In order to transfer the ink, a half-cut rubber roller that can take a wider ink transfer portion was used. If the ink can be transferred (printed) simultaneously to the test piece 1 and the reference pieces 2a and 2b on the color reproduction determination test sheet 100, a 1/4 cut rubber roller may be used.

  As described above, since the predetermined ink can be developed on the test piece 1 and the reference pieces 2a and 2b under the same ink color developing condition, the test piece 1 is sufficiently dried after the ink is sufficiently dried. The color reproduction of each of the sample which is the printing surface, the high quality paper which is the printing surface of the reference piece 2a, and the coated paper which is the printing surface of the reference piece 2b is visually observed. Determine which color reproduction of the paper is close to.

  Further, after the ink is sufficiently dried, the sample (which is the printing surface) of the test piece 1, the fine paper (which is the printing surface) of the reference piece 2a, and the coated paper (which is the printing surface) of the reference piece 2b By measuring the density, saturation, or lightness of the image with a colorimeter, it is possible to specifically determine the color reproduction based on numerical values. Since there is a correlation between the density, lightness, or saturation value at the time of ink color development and the magnitude relationship between the color reproduction range in the printed material, the density, lightness value, or saturation value at the time of color development is based on this correlation. Is used to determine color reproduction.

  In color measurement, it is preferable to measure the “density” that most reflects the color reproduction range. However, when black (K) ink is developed, the “lightness” is relatively good in the color reproduction range. Because it can be reflected, lightness may be measured, and when indigo (C), red (M), and yellow (Y) inks are developed, “saturation” has a relatively wide color reproduction range. Since it can be reflected well, color saturation may be measured.

  In the present embodiment, an example will be described in which black (K) ink is developed on the color reproduction determination test sheet 100 and the density and brightness are acquired by a colorimeter.

  In the present embodiment, in order to further improve the determination accuracy, the sample (which is the printing surface) of the test piece 1, the high quality paper (which is the printing surface) of the reference piece 2a, and the (the printing surface) of the reference piece 2b. With respect to the coated paper, color measurement was performed at three locations, and comparison was made using the average value of the acquired density (or brightness).

<Determination by concentration>
The average value of the density of the sample (which is the printing surface) of the test piece 1 is Ds, the average value of the density of the fine paper (which is the printing surface) of the reference piece 2a is Dr1, and the coating of the reference piece 2b (which is the printing surface) When the average value of the paper density is Dr2, the average value Ds of the sample density is normalized by the following formula 1 to obtain a value Dn (normalized density Dn).
Dn = (Ds−Dr1) / (Dr2−Dr1) × 100 (Formula 1)

  The normalized density Dn of the sample calculated by the above equation 1 becomes a value closer to 100 as the density of the sample is closer to the density of the coated paper, and closer to 0 as the density of the sample is closer to the density of the fine paper. .

  In the present embodiment, based on a predetermined threshold value for density, whether the color reproduction of the sample belongs to the color reproduction range of the high-quality paper, the color reproduction range of the coated paper, or the high-quality paper and the coated paper It is determined whether it belongs to the color reproduction range defined (not limited to the center).

For example, as shown in Table 1, the color reproduction range of the sample is
[1] If the normalized density Dn of the sample is 25 or more, it can be classified into the color reproduction range of the coated paper,
[2] If the normalized density Dn of the sample is less than 25 and 7 or more, it can be classified into a color reproduction range defined between high-quality paper and coated paper (not limited to the center),
[3] If the normalized density Dn of the sample is less than 7, it can be classified into the color reproduction range of fine paper.

<Determination by brightness>
The average value of the brightness of the sample (which is the printing surface) of the test piece 1 is Ls, the average value of the lightness of the fine paper (which is the printing surface) of the reference piece 2a is Lr1, and the coating of the reference piece 2b (which is the printing surface) When the average value of the lightness of the paper is Lr2, the average value Ls of the lightness of the sample is normalized by the following formula 2 to obtain a value Ln (normalized lightness Ln).
Ln = (Ls−Lr1) / (Lr2−Lr1) × 100 (Expression 2)

  The normalized lightness Ln of the sample calculated by Equation 2 is closer to 100 as the lightness of the sample is closer to the lightness of the coated paper, and closer to 0 as the lightness of the sample is closer to the lightness of the fine paper. .

  In the present embodiment, the color reproduction of the sample belongs to the color reproduction range of the high quality paper, the color reproduction range of the coated paper, or the high quality paper and the coated paper based on a predetermined threshold value for brightness. It is determined whether it belongs to the color reproduction range defined (not limited to the center).

For example, as shown in Table 2, the color reproduction range of the sample is
[1] If the normalized lightness Ln of the sample is 25 or more, it can be classified into the color reproduction range of the coated paper,
[2] If the normalized lightness Ln of the sample is less than 25 and 7 or more, it can be classified into a color reproduction range defined between high-quality paper and coated paper (not limited to the center),
[3] If the normalized lightness Ln of the sample is less than 7, it can be classified into the color reproduction range of fine paper.

  As described above, the density and saturation of the sample (which is the printing surface) of the test piece 1, the high quality paper (which is the printing surface) of the reference piece 2a, and the coated paper (which is the printing surface) of the reference piece 2b. Alternatively, the color reproduction of the sample can be specifically classified and determined based on the normalized density Dn (or normalized brightness Ln) of the sample obtained by measuring the brightness with a colorimeter.

  Further, since the reference profiles of the fine paper and the coated paper are already known, if the normalized density Dn (or normalized lightness Ln) of the sample is used as a relative value such as the density of the fine paper and the coated paper, By correcting the reference profile of the coated paper, a sample profile can be easily created.

  In the above-described embodiment, the color reproduction of the sample is classified into any one of the three color reproduction ranges using the predetermined threshold for density (or the predetermined threshold for brightness), but the density of the sample ( Or, compare the density (or lightness or saturation) of either high-quality paper or coated paper with the density (or lightness or saturation) of the quality paper or coated paper. If the density (or lightness, saturation) of the color is the same, the color reproduction range may be classified into the same color reproduction range.

  Further, when the sample has a paper front / back difference, it is preferable to perform color reproduction determination for each of the front and back sides.

  The present invention is not limited to finely coated paper, and can be applied to the determination of the color reproduction range for all printed materials.

  Furthermore, in the present embodiment, printing paper is used as the determination target printing material and the first and second reference printing materials. However, the present invention is not limited to printing paper, and the present invention is also used for determination of a color reproduction range of a printing film or the like. Can be applied. In addition, when applying the color reproduction determination test method of the present invention to the determination of the color reproduction range of a printing film, it is preferable to use an ink that dries as soon as possible after color development, such as UV curable ink.

It is a top view of the sheet | seat 100 for a color reproduction determination test in this embodiment. It is explanatory drawing of the manufacturing method of the sheet | seat 100 for color reproduction determination tests. It is AA sectional drawing of FIG.

Explanation of symbols

1 Test piece 2a Reference piece 2b Reference piece 10 Mount 100 Color reproduction judgment test sheet

Claims (12)

In the color reproduction determination test sheet for determining the color reproduction of the determination target printing material that is the determination target of color reproduction,
A first reference substrate to be used as a determination criterion, and a determination criterion having a color reproduction range different from that of the first reference substrate so that the determination target substrate has a printing surface; A test piece superimposed on the second reference substrate,
A first reference piece obtained by superimposing the first reference printed material on the determination target printed material and the second reference printed material so that the first reference printed material becomes a printing surface;
A second reference piece obtained by superimposing the second reference substrate on the determination target substrate and the first reference substrate so that the second reference substrate is a printing surface;
A sheet for color reproduction determination test, comprising: In the color reproduction determination test sheet according to claim 1,
The first reference substrate is any one of coated paper, matte paper, and high-quality paper,
The color reproduction determination test sheet, wherein the second reference substrate is any one of art paper, coated paper, and matte paper. In the method of manufacturing a color reproduction determination test sheet for determining the color reproduction of a determination target printing material that is a determination target of color reproduction,
A first reference substrate to be used as a determination criterion, and a determination criterion having a color reproduction range different from that of the first reference substrate so that the determination target substrate has a printing surface; A test piece creation step of creating a test piece superimposed on the second reference substrate to be formed;
A first reference piece that creates a first reference piece in which the first reference print is overlapped on the determination target print and the second reference print so that the first reference print becomes a printing surface. Creation process,
A second reference piece for creating a second reference piece in which the second reference print is overlapped on the determination target print and the first reference print so that the second reference print becomes a printing surface. Creation process,
A method for producing a color reproduction determination test sheet, comprising: In the manufacturing method of the sheet for color reproduction judging tests according to claim 3,
Cut the determination target substrate, the first reference substrate, and the second reference substrate to create a plurality of division determination target substrates, a divided first reference substrate, and a divided second reference substrate, respectively. And having a process of
The test piece creation step creates a test piece by superimposing the first division determination target printing material on the first divided first reference printing material and the first divided second reference printing material,
In the first reference piece creating step, the second divided first reference printed material is superposed on the second divided determination target printed material and the second divided first reference printed material, and the first reference piece is overlapped. Create
In the second reference piece creating step, the third divided second reference printed material is superposed on the third divided determination target printed material and the third divided first reference printed material, and the second reference piece. A method for producing a color reproduction determination test sheet, characterized in that: In the method for producing a sheet for color reproduction determination test according to claim 3 or 4,
The first reference substrate is any one of coated paper, matte paper, and high-quality paper,
The method for producing a color reproduction determination test sheet, wherein the second reference substrate is any of art paper, coated paper, and matte paper. In the color reproduction determination test method using the color reproduction determination test sheet according to claim 1 or 2,
A color reproduction determination test method comprising: a color developing step of developing ink on the color reproduction determination test sheet. In the color reproduction determination test method according to claim 6,
In the color developing step, the color is developed on the test piece, the first reference piece, and the second reference piece at the same time using a color developing device that tests and evaluates the printability of the printing material and the ink. Color reproduction judgment test method. In the color reproduction determination test method according to claim 6 or 7,
A colorimetric step for measuring the color of the test piece, the first reference piece, and the second reference piece, respectively;
Average values of density, brightness, or saturation at a plurality of locations of the test piece, average values of density, brightness, or saturation at a plurality of locations of the first reference piece, and concentrations at a plurality of locations of the second reference piece A color reproduction determination test method, wherein color reproduction determination is performed by comparing at least any two of the average value of brightness, or saturation. The color reproduction determination test method according to claim 8,
When the average value of the density of the test piece is Ds, the average value of the density of the first reference piece is Dr1, and the average value of the density of the second reference piece is Dr2, the test piece is expressed by the following formula 1. Based on Dn, which is a value obtained by normalizing the average value of the density, and a predetermined threshold value for density, a color reproduction range of the determination target printing material is converted into a color reproduction range of the first reference printing material. Or a color reproduction range defined between the color reproduction range of the first reference substrate and the color reproduction range of the second reference substrate A color reproduction determination test method characterized by determining whether the color belongs to
Dn = (Ds−Dr1) / (Dr2−Dr1) × 100 (Formula 1) The color reproduction determination test method according to claim 8,
When the average value of the lightness of the test piece is Ls, the average value of the lightness of the first reference piece is Lr1, and the average value of the lightness of the second reference piece is Lr2, the test piece is expressed by the following formula 2. Based on Ln, which is a value obtained by normalizing the average value of the brightness, and a predetermined threshold value for brightness, the color reproduction range of the determination target print is a color reproduction range of the first reference print Or a color reproduction range defined between the color reproduction range of the first reference substrate and the color reproduction range of the second reference substrate A color reproduction determination test method characterized by determining whether the color belongs to
Ln = (Ls−Lr1) / (Lr2−Lr1) × 100 (Expression 2) In the color reproduction determination test method according to claim 9,
When the first reference substrate is high-quality paper and the second reference substrate is coated paper, the predetermined threshold value for density is 25 and 7,
When the value Dn obtained by normalizing the average value of the density of the test piece is 25 or more, the color reproduction of the determination target printing material belongs to the color reproduction range of the second reference printing material. Judgment,
When the value Dn obtained by normalizing the average value of the density of the test piece is less than 25 and 7 or more, the color reproduction of the determination target print is the color reproduction range of the first reference print And a color reproduction range defined between the color reproduction ranges of the second reference substrate,
When the value Dn obtained by normalizing the average value of the density of the test piece is less than 7, the color reproduction of the determination target printing material belongs to the color reproduction range of the first reference printing material. A color reproduction determination test method characterized by determining. The color reproduction determination test method according to claim 10,
When the first reference substrate is high-quality paper and the second reference substrate is coated paper, the predetermined threshold value for brightness is set to 35 and 10,
When the value Ln obtained by normalizing the average value of the brightness of the test piece is 35 or more, the color reproduction of the determination target printed material belongs to the color reproduction range of the second reference printed material. Judgment,
When the value Ln obtained by normalizing the average value of the brightness of the test piece is less than 35 and 10 or more, the color reproduction of the determination target printed material is the color reproduction range of the first reference printed material. And a color reproduction range defined between the color reproduction ranges of the second reference substrate,
When the value Ln obtained by normalizing the average value of the lightness of the test piece is less than 10, the color reproduction of the determination target printing material belongs to the color reproduction range of the first reference printing material. A color reproduction determination test method characterized by determining.

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