JP6090729B1 - Printing system, printing method, and printed material manufacturing method - Google Patents

Abstract

There is provided a printing system capable of obtaining a high-quality printed matter without increasing the pigment concentration more than necessary. A color conversion unit for printing 10 generates first CMYK data obtained by converting R, G, and B values into C, M, Y, and K values with reference to a color profile CP2. The printing machine 20 prints an image based on the first CMYK data on the paper 40 using the ink set 30 having the first pigment concentration. The second CMYK data obtained by converting the target density of the image printed on the paper 40 with reference to the color profile for the high density ink set with the R, G, B values being higher in density than the first pigment density. The printing density when printing on the paper 40 using the ink set having the second pigment density is used. The color profile CP2 has a hue range that includes G and B, increases the required color value over the color profile for the high-density ink set, increases the complementary color to the intermediate density, and decreases the complementary color value when the intermediate density is exceeded. Is set to let [Selection] Figure 1

Description

The present invention prints additive color-mixed red (R), green (G), and blue (B) color signals to subtractive color-mixed cyan (C), magenta (M), yellow (Y), and black (K). printing system is converted into use color signals for printing on paper, printing method, and relates to a print manufacturing how.

  In order to print a digital image composed of RGB data on a sheet, it is necessary to convert the RGB data into CMYK data (see Patent Document 1). The printing machine prints a color image based on CMYK data on a sheet using an ink set composed of C, M, Y, and K inks.

JP 2002-325183 A

  There are various pigment concentrations of each ink in the ink set. If you print an image using a high pigment concentration ink with a higher pigment concentration than the standard pigment concentration of the ink, compared to printing an image using a standard pigment concentration ink with a standard pigment concentration Not only does the print density expressed on the paper increase, but it also has a vivid and high texture, improved human skin reproducibility and high image quality.

  However, it may not be preferable to use a high pigment concentration ink for the following reasons. A high pigment concentration ink is difficult to achieve a desired printing density because the printing density increases only by slightly increasing the amount of ink transferred to the paper. Therefore, it is difficult to use high pigment concentration ink unless it is a skilled operator.

  The offset printing machine wets the non-image area of the plate with dampening water and transfers ink to the image area of the plate. The offset printing machine transfers the ink in the image area onto the paper by bringing the plate into contact with the paper. When high pigment concentration ink is used in an offset printing machine, the amount of ink necessary to obtain a predetermined printing density is reduced, so that dampening water must also be reduced. For the operator, it is easier to control the printing press by increasing the amount of ink to some extent and increasing the amount of dampening water accordingly.

  As described above, it may be preferable to use the standard pigment concentration ink. However, when the standard pigment concentration ink is used, the printing density cannot be increased as in the case of using the high pigment concentration ink, and the image quality should be improved. Is difficult. It is desired to achieve high image quality without increasing the pigment concentration more than necessary.

The present invention aims at providing a printing system capable of without higher than necessary concentration of the pigment to obtain a high-quality printed material, printing method, and a print production how.

The present invention relates to RGB actual data composed of additive color-mixed red, green, and blue color signals, R, G, B values indicating the levels of the color signals of the RGB actual data, and an L ^* a ^* b ^* color system. RGB data including the first color profile indicating the correspondence with the L ^* , a ^* , b ^* values is input, and the L ^* , a ^* , b ^* values of the L ^* a ^* b ^* color system and the subtraction Referring to the second color profile showing the correspondence with the C, M, Y, K values indicating the levels of each color signal of cyan, magenta, yellow, and black of the mixed colors, R, G in the first color profile , B ^* values corresponding to L ^* , a ^* , b ^* values that are most similar to the L ^* , a ^* , b ^* values are selected from the second color profile, and the selected L ^* , a ^{* are} selected ^. , C corresponding to the b ^* values, M, Y, by outputting the K value, said RGB actual data color signals R, G, B A color conversion unit for printing that generates first CMYK data converted into C, M, Y, and K values, cyan, magenta, yellow having a first pigment concentration, and black ink having a predetermined pigment concentration; And a printing machine that prints an image based on the first CMYK data on a sheet using the first ink set, and is printed on the sheet by printing by the printing machine. With reference to the third color profile indicating the correspondence between the L ^* , a ^* , b ^* values and the C, M, Y, K values, the target density of the image is determined as R, G in the first color profile. , B ^* values L ^* , a ^* , b ^* values that are closest to L ^* , a ^* , b ^* values are selected from the third color profile, and the selected L ^* , a ^* values are selected ^. , C corresponding to the b ^* values, M, Y, by outputting the K value, the R The second CMYK data obtained by converting the R, G, and B values of each color signal of the B actual data into C, M, Y, and K values has a second pigment concentration that is higher than the first pigment concentration. The print color conversion unit having a print density expressed on the paper when printed on the paper using a second ink set including cyan, magenta, yellow and black ink having a predetermined pigment density Of the first hue range in the third color profile among the C, M, Y, K values of the respective colors of the first hue range including green and blue as the second color profile. Compared with the C, M, Y, and K values of each color, the value of the necessary color is increased in the range from the low density side to the high density side of each color in the first hue range, and the first color range is increased. Each in the hue range of The color profile is set so that the complementary color is increased from the low density side to a predetermined intermediate density between the low density side and the high density side, and the complementary color value is decreased when the intermediate density is exceeded. A printing system is provided.

The present invention relates to RGB actual data composed of additive color-mixed red, green, and blue color signals, R, G, B values indicating the levels of the color signals of the RGB actual data, and an L ^* a ^* b ^* color system. L ^*, a ^*, and RGB data input step of inputting RGB data including the first color profile indicating the relationship between b ^* values, L ^* a ^* b ^* color system of L ^*, a ^*, Referring to the second color profile showing the correspondence relationship between the b ^* value and the C, M, Y, K value indicating the level of each subtractive cyan, magenta, yellow, and black color signal, the first color The L ^* , a ^* , and b ^* values that are closest to the L ^* , a ^* , and b ^* values associated with the R, G, and B values in the profile are selected from the second color profile and selected. L ^*, a ^*, C corresponding to the b ^* values, M, Y, by outputting the K value, the RGB actual data A CMYK data generation step for generating first CMYK data obtained by converting R, G, B values of each color signal into C, M, Y, K values, and an image based on the first CMYK data as a first pigment density Printing on a sheet using a first ink set that includes cyan, magenta, yellow having a black color and black ink having a predetermined pigment concentration, and the image printed on the sheet in the printing step Referring to the third color profile indicating the correspondence between the L ^* , a ^* , b ^* values and the C, M, Y, K values, R, G, The L ^* , a ^* , b ^* values that are closest to the L ^* , a ^* , b ^* values associated with the B value are selected from the third color profile, and the selected L ^* , a ^* , C corresponding to the b ^* values, M, Y, by outputting the K value, the RGB real The second CMYK data obtained by converting the R, G, and B values of each color signal of the data into C, M, Y, and K values are converted into cyan having a second pigment density higher than the first pigment density. , Magenta, yellow and a black ink having a predetermined pigment concentration, and a print density expressed on the paper when the second ink set is used for printing on the paper, and in the CMYK data generation step Each of the first hue ranges in the third color profile among the C, M, Y, K values of the respective colors in the first hue range including green and blue as the second color profile. Compared with the C, M, Y, and K values of the first color, the value of the necessary color is increased in the range from the low density side to the high density side of each color in the first hue range, Each in the hue range Refer to a color profile that is set so that the complementary color is increased from the low density side to the predetermined intermediate density between the low density side and the high density side, and the complementary color value is decreased when the intermediate density is exceeded. By the above, the printing density expressed on the paper when the image based on the first CMYK data is printed on the paper using the first ink set in the printing step is brought close to the target density. A printing method is provided.

The present invention relates to RGB actual data composed of additive color-mixed red, green, and blue color signals, R, G, B values indicating the levels of the color signals of the RGB actual data, and an L ^* a ^* b ^* color system. L ^*, a ^*, and RGB data input step of inputting RGB data including the first color profile indicating the relationship between b ^* values, L ^* a ^* b ^* color system of L ^*, a ^*, Referring to the second color profile showing the correspondence relationship between the b ^* value and the C, M, Y, K value indicating the level of each subtractive cyan, magenta, yellow, and black color signal, the first color The L ^* , a ^* , and b ^* values that are closest to the L ^* , a ^* , and b ^* values associated with the R, G, and B values in the profile are selected from the second color profile and selected. L ^*, a ^*, C corresponding to the b ^* values, M, Y, by outputting the K value, the RGB actual data A CMYK data generation step for generating first CMYK data obtained by converting R, G, B values of each color signal into C, M, Y, K values, and an image based on the first CMYK data as a first pigment density A printed matter production process for producing a printed matter by printing on a sheet using a first ink set comprising cyan, magenta, yellow having a predetermined pigment concentration and black ink having a predetermined pigment concentration. The target density of the image printed on the paper is determined by referring to the third color profile indicating the correspondence between the L ^* , a ^* , b ^* values and the C, M, Y, K values. The L ^* , a ^* , and b ^* values that are closest to the L ^* , a ^* , and b ^* values associated with the R, G, and B values in the color profile are selected from the third color profile and selected. and L ^*, a ^*, C corresponding to the b ^* values, to output M, Y, and K values Accordingly, the second CMYK data obtained by converting the R, G, B values of the respective color signals of the RGB actual data into C, M, Y, K values is converted into the second color having a higher density than the first pigment density. A print density expressed on the paper when printed on the paper using a second ink set comprising cyan, magenta, yellow having a pigment density and black ink having a predetermined pigment density, and the CMYK In the data generation step, as the second color profile, among the C, M, Y, K values of the respective colors in the first hue range including green and blue, the first color profile in the third color profile is used. Compared with the C, M, Y, and K values of each color in the hue range, the required color value is increased in the range from the low density side to the high density side of each color in the first hue range. The above The complementary color is increased from the low density side to the predetermined intermediate density between the low density side and the high density side in each hue range, and the complementary color value is decreased when the intermediate density is exceeded. By referring to the color profile, the print density expressed on the paper when the image based on the first CMYK data is printed on the paper using the first ink set in the printed matter manufacturing process is obtained. Provided is a method for producing a printed matter, which comprises producing a printed matter that is close to the target density.

The present invention relates to RGB actual data composed of additive color-mixed red, green, and blue color signals, R, G, B values indicating the levels of the color signals of the RGB actual data, and an L ^* a ^* b ^* color system. RGB data including the first color profile indicating the correspondence with the L ^* , a ^* , b ^* values is input, and the L ^* , a ^* , b ^* values of the L ^* a ^* b ^* color system and the subtraction Referring to the second color profile showing the correspondence with the C, M, Y, K values indicating the levels of each color signal of cyan, magenta, yellow, and black of the mixed colors, R, G in the first color profile , B ^* values corresponding to L ^* , a ^* , b ^* values that are most similar to the L ^* , a ^* , b ^* values are selected from the second color profile, and the selected L ^* , a ^{* are} selected ^. , C corresponding to the b ^* values, M, Y, by outputting the K value, said RGB actual data color signals R, G, B A color conversion unit for printing that generates first CMYK data in which C, M, Y, and K values are converted, and an image based on the first CMYK data is converted into cyan, magenta, and yellow having a first pigment density. A printing machine that prints on a sheet using a first ink set including a black ink having a predetermined pigment concentration, and a target density of an image printed on the sheet by printing by the printing machine is set to L ^* , A ^* , b ^* values and C, M, Y, K values are referred to, and the third color profile showing the corresponding relationship is associated with the R, G, B values in the first color profile. L ^* , a ^* , b ^* values that are closest to the L ^* , a ^* , b ^* values are selected from the third color profile, and C corresponding to the selected L ^* , a ^* , b ^* values. , M, Y, K values are output to obtain the R of each color signal of the RGB actual data. The second CMYK data obtained by converting the G and B values into C, M, Y and K values are converted into cyan, magenta, yellow and a predetermined pigment having a second pigment concentration higher than the first pigment concentration. A printing density expressed on the paper when printed on the paper using a second ink set including a black ink having a density, and the printing color conversion unit is configured as the second color profile. Among the C, M, Y, and K values of each color in the first hue range including green and blue, C, M, and Y of each color in the first hue range in the third color profile , K value, the required color value is increased in the range from the low density side to the high density side of each color in the first hue range, and the low value of each color in the first hue range is increased. From the concentration side to the low concentration side Increasing the predetermined value of the complementary color to an intermediate concentration between the concentration side, to provide a printing system, characterized by reference to the color profile the set to reduce the value of the exceeding intermediate density complementary color.

The printing system of the present invention, a printing method, and according to the print production how can without higher than necessary concentration of the pigment to obtain a high-quality printed matter.

1 is a block diagram illustrating a printing system according to a first embodiment. It is a figure which extracts and shows the profile in one hue of green among the 1st and 3rd color profiles. It is a figure which extracts and shows the profile in one hue of green among the 1st and 2nd color profiles. It is a figure which shows the position of one hue of the green of FIG. 2A and 2B. It is a figure which extracts and shows the profile in one hue of blue among the 1st and 3rd color profiles. It is a figure which extracts and shows the profile in one hue of blue among the 1st and 2nd color profiles. FIG. 4B is a diagram illustrating the position of one hue of blue in FIGS. 4A and 4B. It is a figure which extracts and shows the profile in one hue of red among the 1st and 3rd color profiles. It is a figure which extracts and shows the profile in one hue of red among the 1st and 2nd color profiles. It is a figure which shows the position of one hue of red of FIG. 6A and 6B. It is a figure which shows the characteristic of the red in a ^* , b ^* plane by using a high quality conversion color profile (2nd color profile). It is a figure which shows the characteristic of the red in a ^* and L ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of the green in the a ^* and b ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of the green in the a ^* , L ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of the blue in a ^* , b ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of the blue in a ^* and L ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of the cyan in a ^* and b ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of the cyan on a ^* and L ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of the magenta in the a ^* and b ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of yellow in the a ^* and L ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of the magenta in the a ^* and b ^* plane by using a high quality conversion color profile. It is a figure which shows the characteristic of yellow in the a ^* and L ^* plane by using a high quality conversion color profile. It is a figure which shows the specific example of C, M, and Y ink. It is a figure which shows each evaluation of Examples 1-4 and Comparative Examples 1-4. It is a block diagram which shows the printing system of 2nd Embodiment. It is a block diagram which shows the modification of the printing system of 1st and 2nd embodiment.

  Hereinafter, a printing system, a printing method, a printed matter manufacturing method, and an ink set according to each embodiment will be described with reference to the accompanying drawings.

<First Embodiment>
As shown in FIG. 1, the printing system according to the first embodiment includes a printing color conversion unit 10, a printing machine 20, and an ink set 30. The printing color conversion unit 10 receives RGB data including RGB actual data composed of R, G, and B color signals of additive color mixing and RGB / L ^* a ^* b ^* corresponding color profile CP1 (RGB). Data input process). Hereinafter, RGB / L ^* a ^* b ^* corresponding color profile CP1 is abbreviated as color profile CP1. The color profile CP1 is a first color profile.

The RGB data is, for example, image data generated by a digital camera. Color profile CP1 is, R, G, R that indicates the level of each color signal of B, G, and B values, L ^* a ^* b ^* color system ^{(* CIE L * a * b} ) L *, a *, b ^* Shows the correspondence with the value. For example, the RGB actual data and the color profile CP1 may be combined by describing the name of the color profile used as the color profile CP1 in Exif (Exchangeable image file format) information.

  The color profile CP1 may be an ICC profile that conforms to the format of the International Color Consortium (ICC). The RGB data may be expressed by a color space standard called sRGB defined by the International Electrotechnical Commission (IEC), and the color profile CP1 may correspond to sRGB.

The printing color conversion unit 10 has L ^* , a ^* , b ^* .CMYK color profile CP2. Hereinafter, L ^* , a ^* , b ^* .CMYK color profile CP2 is abbreviated as color profile CP2. The color profile CP2 is a second color profile. The color profile CP2 includes L ^* , a ^* , b ^* values of the L ^* a ^* b ^* color system and C, M, Y, K values indicating the levels of the subtractive color signals C, M, Y, K. The correspondence relationship is shown.

The printing color conversion unit 10 refers to the color profile CP2, and L ^* , a ^* that is closest to the L ^* , a ^* , b ^* values associated with the R, G, B values in the color profile CP1 ^. , B ^* values are selected from the color profile CP2, and C, M, Y, K values corresponding to the selected L ^* , a ^* , b ^* values are output. Accordingly, the printing color conversion unit 10 generates CMYK data obtained by converting the R, G, and B values of each color signal of the RGB actual data into C, M, Y, and K values (CMYK data generation step). The CMYK data output from the printing color conversion unit 10 is first CMYK data.

  The printing color conversion unit 10 may be configured by hardware such as an integrated circuit, may be configured by software, or may be configured by a combination of hardware and software.

  The printing machine 20 may be a home or office printer such as an inkjet printer, or may be a business printing machine. In the latter case, the printing press 20 may be an offset rotary printing press, an offset sheet-fed printing press, or a newspaper rotary press.

  The ink set 30 includes C, M, and Y inks having a first pigment concentration and K ink having a predetermined pigment concentration. The ink set 30 is a first ink set. The C, M, and Y inks having the first pigment concentration do not need to mean that the pigment concentrations of the C, M, and Y inks are all the same, and may be adjusted to predetermined concentrations. The first pigment concentration is a standard concentration, which is lower than the second pigment concentration described later. The C, M, and Y inks in the ink set 30 are standard density inks.

  The printing machine 20 prints a color image based on the CMYK data output from the printing color conversion unit 10 on the paper 40 using the ink set 30 (printing process). The paper 40 may be an arbitrary paper such as a coated paper or an additional paper (lower paper). When the printing machine 20 prints a color image on the paper 40, the printed material 41 in which the ink 30i is applied on the paper 40 is manufactured (printed material manufacturing process).

  Here, the printing machine 20 converts a color image based on the CMYK data into C, M, and Y inks having a second pigment density higher than the first pigment density, and K having a predetermined pigment density. Assume that printing is performed on paper 40 using an ink set including ink. The ink set at this time is defined as a second ink set.

  Similarly, the C, M, and Y inks having the second pigment concentration do not have to mean that the pigment concentrations of the C, M, and Y inks are all the same. Good. The C, M, and Y inks in the second ink set are higher in density than those in the ink set 30 and are high pigment density inks.

  That is, when the same color inks of the second ink set and the ink set 30 (first ink set) are compared, the pigment concentration of the C, M, Y ink in the second ink set and the C in the ink set 30 are compared. , M and Y inks have the following relationship with the pigment concentration. The pigment concentration of the C ink in the second ink set is higher than the pigment concentration of the C ink in the ink set 30. The pigment concentration of the M ink in the second ink set is higher than the pigment concentration of the M ink in the ink set 30. The pigment concentration of the Y ink in the second ink set is higher than the pigment concentration of the Y ink in the ink set 30. In other words, it is not a comparison between different color inks in the second ink set and the ink set 30.

  Note that the pigment concentrations of the K ink in the ink set 30 and the K ink in the second ink set may be the same or different.

  The first ink set and the second ink set are selected from, for example, ink sets SA to SD described later. C, M, and Y inks have the highest pigment concentration in ink set SA, ink set SB is lower than ink set SA, ink set SC is lower than ink set SB, and ink set SD is the lowest (pigment concentration: SA> SB> SC> SD).

  If the ink set SB is selected as the first ink set, the ink set SA becomes the second ink set. If the ink set SC is selected as the first ink set, the ink set SB (or SA) becomes the second ink set. If the ink set SD is selected as the first ink set, the ink set SC (or SB or SA) becomes the second ink set.

  Ink set SA may be selected as the first ink set. If the ink set SA is selected as the first ink set, an ink set having a pigment concentration higher than that of the ink set SA becomes the second ink set.

  The first ink set thus selected is referred to as a “standard density ink set”, and the second ink having a C, M, Y ink having a higher density than the pigment density of the C, M, Y ink of the standard density ink set. The ink set is referred to as a “high density ink set”.

When the printing machine 20 prints using a high-density ink set, if the color profile referred to by the printing color conversion unit 10 is a color profile set on the assumption that the high-density ink set is used, the print 41 Color images have high image quality. A color profile corresponding to the high density ink set is defined as a third color profile. The third color profile shows the correspondence between L ^* , a ^* , b ^* values and C, M, Y, K values. The third color profile may be referred to as a high density color profile.

The printing color conversion unit 10 refers to the third color profile, and L ^* , a ^* that is closest to the L ^* , a ^* , b ^* values associated with the R, G, B values in the color profile CP1. ^It is assumed that ^* , b ^* values are selected from the third color profile, and C, M, Y, K values corresponding to the selected L ^* , a ^* , b ^* values are output. At this time, the CMYK data generated by the printing color conversion unit 10 is set as second CMYK data.

  When the printing machine 20 prints the color image based on the first CMYK data on the paper 40 using the standard density ink set, the printing machine 20 sets the color image based on the second CMYK data to a high density. A print density expressed on the paper 40 when the ink set is used to print on the paper 40 is used.

  Next, while using the ink set 30 of the standard density ink set, the density when the color image based on the first CMYK data is printed on the paper 40 is improved to the same level as when the high density ink set is used. A specific color profile CP2 will be described.

  FIG. 2A shows an extracted profile of one hue of G out of the color profile CP1 and the third color profile. A profile in one hue of G of the color profile CP1 is a profile CP1g, and a profile in one hue of G of the third color profile is a profile CP3g.

  FIG. 2B shows an extracted profile having the same hue as that of FIG. 2A out of the color profile CP1 and the color profile CP2 (second color profile). A profile in one hue of G of the color profile CP2 is defined as a profile CP2g. In the profiles shown in FIGS. 2A and 2B, the upper side is the light (low density) side, and the lower side is the shadow (high density) side.

Hue shown in FIGS. 2A and 2B, L a ^* of ^* a ^* b ^* color space, a hue of the position shown in FIG. 3 (a) when seen in b ^* plane, L ^* a ^* b ^* color space When viewed three-dimensionally, the hue at the position shown in FIG. In FIGS. 3A and 3B, the concentration increases in the direction of the arrow.

  The necessary colors of G are C and Y, and the complementary color is M. As shown in FIG. 2B, in the profile CP2g, as compared with the profile CP3g, the necessary colors C and Y from the light to the shadow are increased as a whole. The required colors C and Y should be increased almost uniformly.

  In the profile CP2g, the complementary color M is increased from light to a predetermined intermediate density between light and shadow, as compared with the profile CP3g. In the profile CP2g, the complementary color M is decreased when the intermediate density is exceeded. The value of the complementary color M immediately after the complementary color M changes from increasing to decreasing is larger than the value of the complementary color M in the profile CP3g, but gradually decreases. The complementary color M should increase linearly and decrease linearly.

  Further, in the profile CP2g, after a predetermined intermediate density between the light and the shadow, a technique called UCR (Under Color Removal) is used to replace some of the C, M, and Y values with K values. ing. Although it is not essential to use UCR, using UCR can reduce the amount of C, M, and Y ink used.

  FIG. 4A shows an extracted profile of one hue of B out of the color profile CP1 and the third color profile. A profile in one hue of B of the color profile CP1 is a profile CP1b, and a profile in one hue of B of the third color profile is a profile CP3b.

  FIG. 4B shows an extracted profile in the same hue as in FIG. 4A out of the color profile CP1 and the color profile CP2 (second color profile). A profile in one hue of B of the color profile CP2 is defined as a profile CP2b. In the profiles shown in FIGS. 4A and 4B, the upper side is the light side and the lower side is the shadow side.

Hue shown in FIGS. 4A and 4B, L ^* a ^* b ^* color space a ^*, a hue of the position shown in FIG. 5 (a) when seen in b ^* plane, L ^* a ^* b ^* color space When viewed three-dimensionally, the hue at the position shown in FIG. In (a) and (b) of FIG. 5, the concentration increases in the direction of the arrow.

  The necessary colors for B are C and M, and the complementary color is Y. As shown in FIG. 4B, in the profile CP2b, compared to the profile CP3b, the necessary colors C and M are increased from light to shadow as a whole. The required colors C and M should be increased almost uniformly.

  In the profile CP2b, the complementary color Y is increased from light to a predetermined intermediate density between light and shadow, as compared with the profile CP3b. The intermediate density here is a density at a position biased toward the light side. In the profile CP2b, the complementary color Y is reduced when the intermediate density is exceeded. The value of the complementary color Y immediately after the complementary color Y changes from increasing to decreasing is the same as the value of the complementary color Y in the profile CP3b, but gradually decreases. The complementary color Y should decrease linearly. When the complementary color Y is increased in a plurality of stages, it is preferable to increase it linearly.

  Further, in the profile CP2b, after the predetermined intermediate density between the light and the shadow, a part of the C, M, and Y values is replaced with the K value using the UCR. As with profile CP2g, it is not essential to use UCR.

  Here, only one hue of G and one hue of B are extracted and described, but in the hue range including G and B, the color profile CP2 has the same characteristics. That is, the color profile CP2 increases the necessary color value in the range from light to shadow, increases the complementary color to a predetermined intermediate density between light and light and shadow, and if the intermediate density is exceeded, the complementary color value is increased. It is set to decrease.

  In the hue range including G and B, the position of the intermediate density between the light and the shadow where the complementary color starts to decrease may be appropriately set according to each hue.

  FIG. 6A shows an extracted profile in one hue of R out of the color profile CP1 and the third color profile. A profile in one hue of R of the color profile CP1 is a profile CP1r, and a profile in one hue of R of the third color profile is a profile CP3r.

  FIG. 6B shows an extracted profile having the same hue as that of FIG. 6A out of the color profile CP1 and the color profile CP2 (second color profile). A profile in one hue of R of the color profile CP2 is defined as a profile CP2r. 6A and 6B, the upper side is the light side, and the lower side is the shadow side.

Hue shown in FIGS. 6A and 6B, L a ^* of ^* a ^* b ^* color space, a hue of the position shown in FIG. 7 (a) when seen in b ^* plane, L ^* a ^* b ^* color space When viewed three-dimensionally, the hue at the position shown in FIG. In (a) and (b) of FIG. 7, the concentration increases in the direction of the arrow.

  The required colors for R are M and Y, and the complementary color is C. As shown in FIG. 6B, in the profile CP2r, compared to the profile CP3r, the necessary colors M and Y are increased from the light to the shadow as a whole. The required colors M and Y should be increased almost uniformly.

  Further, in the profile CP2r, compared to the profile CP3r, the complementary color C is set to the same value without increasing and decreasing from a light to a predetermined intermediate density between light and shadow. In the profile CP2r, the complementary color C is reduced when the intermediate density is exceeded. The complementary color C should decrease linearly.

  Further, in the profile CP2r, after a predetermined intermediate density between light and shadow, a part of C, M, and Y values are replaced with K values using UCR. As with the profiles CP2g and CP2b, it is not essential to use UCR.

  Here, only one hue of R has been extracted and described, but in the hue range including R, the color profile CP2 has the same characteristics. That is, the color profile CP2 increases the value of the necessary color in the range from light to shadow, and does not increase or decrease the complementary color to a predetermined intermediate density between light and light and shadow. Is set to decrease.

  In the hue range including R, the position of the intermediate density between the light and the shadow where the complementary color starts to decrease may be appropriately set according to each hue.

  By the way, since Y is a vivid color in the first place, the profile of the hue range including Y may not have characteristics such as the hue range including G and B or the profile of the hue range including R. In the hue range including Y, the C, M, Y, and K values of the color profile CP2 may be slightly increased or decreased as compared with the C, M, Y, and K values of the third color profile.

  The third color profile extracted and exemplified in FIGS. 2A, 4A, and 6A is a color profile suitable when the ink set SB is used as the high-density ink set. The color profile CP2 extracted and exemplified in FIGS. 2B, 4B, and 6B is a color profile suitable when the ink set SC is used as the standard density ink set.

  The C, M, Y, and K values in the third color profile and the color profile CP2 differ depending on which ink set is used as the high density ink set and which ink set is used as the standard density ink set. However, in any case, the C, M, Y, and K values of the color profile CP2 when compared with the C, M, Y, and K values of the third color profile have the same characteristics as described above. .

  The effect of the printing color conversion unit 10 converting RGB actual data into CMYK data using the color profile CP2 will be described with reference to FIGS.

  8 to 19, a curve obtained by connecting Δ with a one-dot chain line is color-converted by the printing color conversion unit 10 using the high-density color profile (third color profile), and the printing machine 20 is the high-density ink. The characteristic when it prints using a set is shown.

  A curve formed by connecting □ with a broken line indicates characteristics when the printing color conversion unit 10 performs color conversion using the high density color profile and the printing machine 20 performs printing using the standard density ink set. The curve obtained by connecting the solid lines with ○ indicates the characteristics when the printing color conversion unit 10 performs color conversion using the high-quality conversion color profile (color profile CP2) and the printing machine 20 performs printing using the standard density ink set. Show.

As shown in FIGS. 8 and 9, the R print image when the high-quality conversion color profile and the standard density ink set are combined is the R print image when the high density color profile and the standard density ink set are combined. It is brighter than the printed image. The print image of R when combining the high-quality conversion color profile and the standard density ink set is the a ^* , b ^* plane and a ^* , L ^* plane, and the high density color profile and high density ink set are combined. Approximate to the printed image of R.

As shown in FIGS. 10 and 11, the G print image when the high-quality conversion color profile and the standard density ink set are combined is the G print image when the high density color profile and the standard density ink set are combined. It is brighter than the printed image. The print image of G when combining the high-quality conversion color profile and the standard density ink set is the a ^* , b ^* plane and a ^* , L ^* plane, combining the high density color profile and the high density ink set. It is approximate to the printed image of G.

  As shown in FIGS. 12 and 13, when the high-quality conversion color profile and the standard density ink set are combined, the B print image is the B print when the high density color profile and the standard density ink set are combined. It is brighter than the image.

As shown in FIG. 12, when the high-quality conversion color profile and the standard density ink set are combined, the print image of B is on the a ^* and b ^* planes. It approximates to the printed image of B when the color profile and the high density ink set are combined. As shown in FIG. 13, when the high-quality conversion color profile and the standard density ink set are combined, the print image of B is the a ^* , L ^* plane, and the color profile for high density and the high density ink set are combined. Approximate to the printed image of B at the time.

As shown in FIGS. 14 and 15, the printed image of C when the high-quality conversion color profile and the standard density ink set are combined is the C print image when the high density color profile and the standard density ink set are combined. It is brighter than the printed image. The printed image of C when the high-quality conversion color profile is combined with the standard density ink set is the a ^* , b ^* plane and a ^* , L ^* plane, and the high density color profile and high density ink set are combined. Is similar to the printed image of C.

  As shown in FIGS. 16 and 17, when the high-quality conversion color profile and the standard density ink set are combined, the M print image is the M print when the high density color profile and the standard density ink set are combined. It is brighter than the image.

As shown in FIG. 16, when the high-quality conversion color profile and the standard density ink set are combined, the printed image of M is on the a ^* and b ^* planes. And a printed image of M when combined with a high density ink set. As shown in FIG. 17, when the high-quality conversion color profile and the standard density ink set are combined, the printed image of M is a ^* and L ^* plane, and the color profile for high density and the high density ink set are combined. It approximates the printed image of M at the time.

As shown in FIGS. 18 and 19, the Y print image when the high-quality conversion color profile and the standard density ink set are combined is the a ^* , b ^* plane and the a ^* , L ^* plane for high density. It approximates a Y print image when a color profile and a high-density ink set are combined.

  Thus, according to the printing system, the printing method, and the printed matter manufacturing method of the first embodiment, there is almost no inferiority to the printed image when the high-density color profile and the high-density ink set are combined, and high image quality Can be obtained. That is, according to the printing system, the printing method, and the printed matter manufacturing method of the first embodiment, a high-quality printed matter can be obtained without increasing the pigment concentration more than necessary.

  According to the printing system, the printing method, and the printed matter manufacturing method of the first embodiment, the following effects are also achieved. Assuming that the printing press 20 uses a high-density ink set, the key opening for adjusting the output amount of ink is adjusted, and the film thickness of the ink 30i of the printed matter 41 is adjusted. Even when the printing machine 20 uses a standard density ink set instead of a high density ink set, the film thickness of the ink 30i should be approximately the same without greatly changing the key opening by using the high image quality conversion color profile. Can do. Even if a standard density ink set is used, it hardly affects the drying property, halftone dot reproducibility, and gloss level.

  Next, the 1st ink set which can be used in this embodiment is demonstrated concretely. The second ink set has the same composition as the first ink set except that the pigment concentration is different as described above.

  Since the printing system, printing method, and printed material manufacturing method of the present embodiment can be applied to various printing methods, the ink used is not particularly limited, and various types suitable for the printing method are used. Can be selected. Among these, offset printing using a lithographic method is preferable, and offset printing ink is preferably used.

  There are various types of offset printing ink, and there is no particular limitation. For example, heat set offset ink, oxidation polymerization offset ink, osmotic drying offset ink and active energy ray curable offset ink can be mentioned, and it is more preferable to use heat set offset ink from the viewpoint of excellent drying properties. .

  The heat-set type offset ink is an ink that is dried by being heated after being transferred to a paper, and by evaporating the solvent content in the ink. The ink generally includes a pigment, a binder resin, and a solvent. The pigment is not particularly limited, and any organic pigment or inorganic pigment generally used in ink can be used. The pigment content is preferably 5 to 30% by mass relative to the total amount of ink.

  Examples of organic pigments include, for example, azo-based, soluble azo pigments such as C-based (β-naphthol-based), 2B-based and 6B-based (β-oxynaphthoic-based), β-naphthol-based, β-oxynaphthoic acid anilide-based, monoazo yellow-based Insoluble azo pigments such as disazo yellow and pyrazolone, and condensed azo pigments such as acetoacetanilide.

  Examples of organic pigments include copper phthalocyanines (α blue, β blue, ε blue), halogenated copper phthalocyanines such as chlorine and bromine, and metal-free phthalocyanine pigments as phthalocyanine series. Further, examples of the organic pigment include perylene-based, perinone-based, quinacridone-based, thioindigo-based, dioxazine-based, isoindolinone-based, and quinophthalone-based pigments as polycyclic pigments.

  Examples of the inorganic pigment include chrome yellow, zinc yellow, bitumen, barium sulfate, cadmium red, titanium oxide, zinc white, dial, alumina white, ultramarine blue, carbon black, graphite, and aluminum powder.

  Examples of the binder resin include rosin-modified phenolic resin, rosin-modified maleic resin, alkyd resin, polyester resin, and petroleum resin, and these can be used alone or in combination of two or more. The content of the binder resin is preferably 20 to 50% by mass in the ink and more preferably 30 to 45% by mass from the viewpoint of printability.

  Preferably, a rosin-modified phenol resin can be used as the binder resin. The rosin-modified phenol resin is a resin obtained by reacting rosin with a phenol-formaldehyde initial condensate (resole resin) and then esterifying with a polyhydric alcohol. Examples of rosins of general rosin-modified phenol resins include gum rosin, wood rosin, tall rosin, polymerized rosin, disproportionated rosin, and hydrogenated rosin.

  Among these, rosin having a mass average molecular weight of 10,000 to 200,000, more preferably 20,000 to 100,000, and still more preferably 30,000 to 70,000, from the viewpoint of maintaining both the viscoelasticity and fluidity of the ink appropriately and ensuring solubility and the like. It is preferable to use a modified phenolic resin.

  In addition, in this specification including the Example mentioned later, a mass mean molecular weight is the value measured using Tosoh Co., Ltd. GPC (gel permeation chromatography) "HLC-8020." A calibration curve was prepared with a standard polystyrene sample. Tetrahydrofuran was used as the eluent, and three “TSKgel SuperHM-M” (manufactured by Tosoh Corporation) were used as the column. The measurement was performed at a flow rate of 0.6 ml / min, an injection volume of 10 μl, and a column temperature of 40 ° C.

  Moreover, it is preferable that the normal paraffin white turbidity temperature of a rosin modified phenol resin is the range of 80-180 degreeC, More preferably, it is the range of 100-170 degreeC. If it is this range, solubility will be suitable and backing resistance, blocking resistance, glossiness, and inking property will be favorable. Here, the normal paraffin white turbidity temperature refers to the lower limit temperature at which white turbidity occurs when 10% by mass of the resin and 90% by mass of normal paraffin having 14 to 16 carbon atoms are heated and mixed. No cloudiness is observed at temperatures exceeding the normal paraffin cloudiness temperature.

  As the solvent, one or more volatile petroleum solvents that can be easily dried with hot air can be used, but one or more vegetable oils are appropriately combined in consideration of the environment. Is also preferable. A petroleum-based solvent is a solvent that is generally referred to as an aroma-free solvent and contains less than 1% by weight of aromatic hydrocarbons. Preferably, those having a boiling point of 230 to 300 ° C., more preferably 240 to 280 ° C. can be used, and specific examples include AF Solvent No. 4 and AF Solvent No. 7 manufactured by JX Energy Corporation. The petroleum solvent is preferably 10 to 45% by mass or more preferably 15 to 40% by mass with respect to the total amount of ink from the viewpoint of drying property, resin solubility, or environmental consideration.

  Vegetable oils are vegetable oils or compounds derived from vegetable oils, and regenerated vegetable oils can also be used. Typical vegetable oils include Asa seed oil, flaxseed oil, eno oil, psyllium oil, olive oil, cacao oil, kapok oil, kaya oil, mustard oil, kyounin oil, kiri oil, kukui oil, walnut oil, poppy oil, sesame oil , Safflower oil, radish seed oil, soybean oil, daikon oil, camellia oil, corn oil, rapeseed oil, niger oil, nuka oil, palm oil, castor oil, sunflower oil, grape seed oil, gentian oil, pine seed oil Cottonseed oil, coconut oil, peanut oil, and dehydrated castor oil can be exemplified, and heat-polymerized oil and oxygen-blown polymerized oil thereof can also be used. The content of the vegetable oil is preferably in the range of 7 to 40% by mass and more preferably 10 to 30% by mass with respect to the total amount of ink from the viewpoint of solubility and environmental consideration.

  For ink, gelling agent, pigment dispersant, metal dryer, drying inhibitor, antioxidant, anti-friction agent, anti-set-off agent, nonionic sea surface active agent, polyhydric alcohol, etc. Additives can be used as appropriate.

  The oxidation polymerization type offset ink is an ink in which vegetable oil is oxidized and solidified by oxygen in the air and dried after printing on paper. The ink generally includes a pigment, a binder resin, a metal dryer, and a solvent. As the pigment, the binder resin, and the solvent, the same components as exemplified in the heat set type offset ink can be used. The same applies to other optional components.

  In contrast to the heat-set type offset ink, the oxidation polymerization type offset ink contains a metal dryer. The metal dryer is an oxidative polymerization catalyst that promotes oxidative polymerization. For example, acetic acid, propionic acid, butyric acid, isopentanoic acid, hexanoic acid, 2-ethylbutyric acid, naphthenic acid, octylic acid, nonanoic acid, decanoic acid, 2-ethyl Hexanoic acid, isooctanoic acid, isononanoic acid, lauric acid, palmitic acid, stearic acid, oleic acid, linoleic acid, neodecanoic acid, versatic acid, secanoic acid, tall oil fatty acid, linseed oil fatty acid, soybean oil fatty acid, dimethylhexanoic acid , 3,5,5-trimethylhexanoic acid, and metal salts of organic carboxylic acids such as dimethyloctanoic acid, such as calcium, cobalt, lead, iron, manganese, zinc, and zirconium salts. Compounds can be used. In order to promote the ink surface and internal curing, a plurality of these may be used in combination as appropriate.

  The ink preferably contains a gelling agent. The gelling agent is preferably used when the binder resin is varnished. This makes it easy to adjust the viscosity of the ink. Examples of the gelling agent include azirine compounds such as trimethylolpropane-tris-β-N-aziridinylpropionate and pentaerythritolpropane-tris-β-N-aziridinylpropionate. . Examples of the gelling agent include epoxy compounds such as glycerol polyglycidyl ether and trimethylolpropane polyglycidyl ether; and aluminum chelate compounds such as ethyl acetoacetate aluminum diisoporopoxide and aluminum trisethyl acetoacetate. it can.

  Furthermore, examples of the gelling agent include aluminum alcoholates such as aluminum isopropoxide, mono-sec-butoxyaluminum diisopropoxide, and aluminum tri-sec-butoxide.

  The active energy ray-curable offset ink is an ink in which a polymerizable monomer is polymerized and dried by irradiating active energy rays such as ultraviolet rays after printing on paper. The ink generally contains a pigment, a binder resin, a radical polymerizable monomer, and a radical polymerization initiator. As the pigment, the same pigments as those exemplified in the heat set offset ink can be used. The same applies to other additives.

  As the binder resin, a thermosetting or thermoplastic resin that does not have a reactive functional group such as an ethylenically unsaturated double bond and is non-reactive with respect to active energy rays can be used. As these resins, those which are soluble in the radical polymerizable monomer are selected, and the mass average molecular weight is preferably about 10,000 to 1,000,000.

  Specifically, for example, polyvinyl chloride, poly (meth) acrylic acid ester, epoxy resin, polyurethane resin, cellulose derivative (for example, ethyl cellulose, cellulose acetate, nitrocellulose), vinyl chloride-vinyl acetate copolymer, polyamide resin , Polyvinyl acetal resin, diallyl phthalate resin, and synthetic rubber (for example, butadiene-acrylonitrile copolymer). These resins can be used alone or in combination of two or more. Of these, diallyl phthalate resin is preferably used.

  As the radical polymerizable monomer, one or two or more monomers having an ethylenically unsaturated double bond can be used. The mass average molecular weight is not particularly limited, but is preferably 100 to 6000, and more preferably 200 to 5000. The radical polymerizable monomer is preferably used in the range of 5 to 60% by mass in the ink.

  More specifically, the monomer having an ethylenically unsaturated double bond is preferably a monofunctional or polyfunctional (meth) acrylate, or an oligomer having an ethylenically unsaturated double bond (reactive oligomer). The viscosity of the ink can be adjusted by appropriately combining these. In addition, in the case of monofunctional or polyfunctional (meth) acrylates, the mass average molecular weight of the monomer is a molecular weight calculated from the structural formula, and an oligomer having an ethylenically unsaturated double bond (reactive oligomer) ) Is the mass average molecular weight measured by GPC as described above.

  The monofunctional (meth) acrylate is, for example, an alkyl ester of (meth) acrylic acid, and the alkyl preferably has 2 to 18 carbon atoms. Specific examples include ethyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, dodecyl (meth) acrylate, and stearyl (meth) acrylate. In addition, benzyl (meth) acrylate, isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, tricyclodecane monomethylol (meth) acrylate, and the like can be used.

  Polyfunctional (meth) acrylates include ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate , Polypropylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, pentyl glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, neopentyl glycol hydroxypivalate ester diacrylate (commonly known as MANDA), hydroxypi Valylhydroxypivalate dicaprolactonate di (meth) acrylate, 1,6 hexanediol di (meth) acrylate, 1,8-octanediol (Meth) acrylate, 1,9-nonanediol di (meth) acrylate, 1,2-hexadecanediol di (meth) acrylate, 2-methyl-2,4-pentanediol di (meth) acrylate, bisphenol A tetraethylene oxide Adduct di (meth) acrylate, bisphenol F tetraethylene oxide adduct di (meth) acrylate, water-added bisphenol A tetraethylene oxide adduct di (meth) acrylate, water-added bisphenol F tetraethylene oxide adduct di (meth) acrylate , Water-added bisphenol A di (meth) acrylate, water-added bisphenol F di (meth) acrylate, glycerin tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolprop N-tricaprolactonate tri (meth) acrylate, trimethylolethane tri (meth) acrylate, trimethylolhexane tri (meth) acrylate, trimethyloloctanetri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra ( (Meth) acrylate, diglycerin tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, ditrimethylolpropane tetracaprolactonate, tetra (meth) acrylate, ditrimethylolethanetetra (meth) acrylate, ditrimethylolbutanetetra ( (Meth) acrylate, ditrimethylolhexanetetra (meth) acrylate, ditrimethyloloctanetetra (meth) acrylate, dipen Erythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, can be used tripentaerythritol hexa (meth) acrylate, tripentaerythritol hepta (meth) acrylate, and tripentaerythritol octa (meth) acrylate.

  As the oligomer having an ethylenically unsaturated double bond (reactive oligomer), alkyd acrylate, epoxy acrylate, urethane-modified acrylate, or the like is used.

  A general thing can be used as a radical polymerization initiator, and it is not specifically limited. For example, benzophenone, 4,4′-diethylaminobenzophenone, diethylthioxanthone, 2-methyl-1- (4-methylthio) phenyl-2-morpholinopropan-1-one, 4-benzoyl-4′-methyldiphenyl sulfide, 1 -Chloro-4-propoxythioxanthone, isopropylthioxanthone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxy-cyclohexyl-phenylketone, bis-2,6-dimethoxybenzoyl-2,4 4-trimethylpentylphosphine oxide, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2,2-dimethyl-2-hydroxyacetophenone, 2,2-dimethoxy-2-fe Ruasetofenon, 2,4,6-trimethyl-benzyl - diphenyl phosphine oxide, and 2-benzyl-2-dimethylamino-1- (morpholinophenyl) - butan-1-one, and the like. A sensitizer such as p-dimethylaminobenzoic acid ethyl ester or pentyl 4-dimethylaminobenzoate may be used in combination with these polymerization initiators.

  Various papers can be used in the printing system, the printing method, and the printed material manufacturing method of the present embodiment. For example, high-quality paper, medium-quality paper, kraft paper, etc. can be used in addition to the above-described coated paper and renewal paper, and there is no particular limitation.

  Hereinafter, embodiments will be described in more detail by way of examples. The following examples do not limit the scope of rights of the present invention. Unless otherwise specified, “part” represents “part by mass” and “%” represents “% by mass”. Moreover, the compounding quantity in a table | surface is a mass part.

(Synthesis Example 1) Resol-type phenol resin In a four-necked flask equipped with a stirrer, a cooler, and a thermometer, under a nitrogen atmosphere, 1000 parts of octylphenol, 480 parts of paraformaldehyde with a purity of 92%, water with a purity of 98% 10 parts of calcium oxide and 530 parts of xylene were added and reacted at 90 ° C. for 5 hours with stirring. Thereafter, 430 parts of xylene and 250 parts of water were added to the flask, and 10 parts of sulfuric acid having a concentration of 98% was added dropwise with stirring. It stirred after completion | finish of dripping and left still. Subsequently, the upper layer part (water) of the solution was removed, the lower layer part solution was taken out, and a resol type phenol resin solution having a nonvolatile content of 60% was obtained.

(Synthesis Example 2) Rosin-modified phenolic resin 440 parts of gum rosin were charged in a four-necked flask equipped with a stirrer, a condenser with a water separator, and a thermometer, and dissolved at 200 ° C. with stirring in a nitrogen atmosphere. Next, 870 parts of the above-mentioned resol type phenol resin solution was added dropwise to the flask over 2 hours while maintaining the internal temperature of 200 ° C. Thereafter, the internal temperature was raised to 250 ° C. while removing xylene, and 40 parts of glycerin and 0.22 part of p-toluenesulfonic acid were charged and reacted for 14 hours while maintaining 250 ° C. After completion of the reaction, the mixture was cooled to obtain a rosin-modified phenol resin having a mass average molecular weight (Mw) of 60000 and an acid value of 26 mgKOH / g.

(Production Example 1) Gel varnish 1
In a four-necked flask equipped with a stirrer, a Liebig condenser, and a thermometer, 44 parts of the rosin-modified phenolic resin A, 35 parts of regenerated soybean oil (iodine value 117), AF solvent 7 as a petroleum solvent (trade name) , JX Energy Co., Ltd.) 20 parts, ALCH (trade name, ethyl acetoacetate aluminum diisopropoxide, produced by Kawaken Fine Chemical Co., Ltd.) 1 part as a gelling agent is charged, and the internal temperature is kept under stirring in a nitrogen atmosphere. The temperature was raised to 190 ° C. After reacting at 190 ° C. for 1 hour, the mixture was cooled to obtain Gel Varnish 1. Using the obtained gel varnish 1, offset printing ink of each color was produced as follows.

(Production of C ink)
To the 2.5 L flasher, Lionol Blue No. Charge 571 parts (non-volatile content 49%) of 7334P (trade name, manufactured by Toyocolor Co., Ltd.), mix 500 parts of the gel varnish 1 with stirring, perform flushing, and remove moisture in the press cake with the varnish. Replaced. Thereafter, the substituted water was removed, and 220 parts of gel varnish 1 were further added and mixed, followed by dehydration under reduced pressure at 120 ° C. until the water content became 0.5% or less, thereby producing a C flushing base ink. . Next, the mixture was kneaded with 3 rolls of C flushing base ink to obtain a kneaded base (C base ink). The obtained C base ink, gel varnish 1, AF solvent 7 and the regenerated soybean oil were mixed in the proportions shown in FIG. 20, and the pigment concentrations were 6%, 12%, 18% and 24%, respectively. C ink was obtained.

(M ink production)
Lionol Red 6B No. as M pigment in 2.5 L flasher Charge 818 parts (nonvolatile content 28%) of press cake of 4214SP (trade name, manufactured by Toyocolor Co., Ltd.), mix with 500 parts of the above gel varnish 1 and perform flushing to stir the moisture in the press cake. Replaced with. Thereafter, the substituted water was removed, and 131 parts of gel varnish 1 were further added and mixed, followed by dehydration under reduced pressure at 120 ° C. until the moisture content was 0.5% or less, thereby producing an M flushing base ink. . Next, M flushing base ink was kneaded with three rolls to obtain a kneaded base (M base ink). The obtained M base ink, gel varnish 1, the above AF solvent No. 7, and the above regenerated soybean oil were mixed in the proportions shown in FIG. 20, and each of the M having a pigment concentration of 6%, 12%, 18%, and 24% was mixed. An ink was obtained.

(Production of Y ink)
As a Y pigment to 2.5 L flasher, Lionol Yellow No. 1213-P (trade name, manufactured by Toyocolor Co., Ltd.) press cake 818 parts (non-volatile content 22%), blending 500 parts of the gel varnish 1 with stirring, flushing, moisture in the press cake Was replaced with varnish. Thereafter, the substituted water was removed, and 320 parts of gel varnish 1 were further added and mixed, followed by dehydration under reduced pressure at 120 ° C. until the moisture content was 0.5% or less, to produce a Y flushing base ink. . Next, Y flashing base ink was kneaded with three rolls to obtain a kneaded base (Y base ink). The obtained Y base ink, gel varnish 1, the above AF solvent No. 7, and the above regenerated soybean oil were mixed in the proportions shown in FIG. 20, and the pigment concentrations were 3%, 7%, 11%, and 15%, respectively. Y ink was obtained.

(Production of K ink)
20 parts of carbon black (DBP oil absorption 72 ml / 100 g, BET specific surface area 99 m ² / g, manufactured by Mitsubishi Chemical Corporation), 74 parts of the gel varnish 1 and 6 parts of a petroleum solvent (AF solvent 7) are mixed, Kneading was performed using three rolls to obtain a K ink having a pigment concentration of 20%.

Based on the pigment concentration of each of the obtained inks, the following ink sets SA to SD were prepared.
(1) Ink set SA
C ink with 24% pigment concentration M ink with 24% pigment concentration Y ink with 15% pigment concentration K ink with 20% pigment concentration

(2) Ink set SB
C ink with a pigment concentration of 18% M ink with a pigment concentration of 18% Y ink with a pigment concentration of 11% K ink with a pigment concentration of 20%

(3) Ink set SC
C ink with 12% pigment concentration M ink with 12% pigment concentration Y ink with 7% pigment concentration K ink with 20% pigment concentration

(4) Ink set SD
C ink with 6% pigment concentration M ink with 6% pigment concentration Y ink with 3% pigment concentration K ink with 20% pigment concentration

<Examples and Comparative Examples>
The printing machine 20 uses the ink sets SA to SD, RGB data is printed on the paper 40 using CMYK data using the high-quality conversion color profile, and RGB data is printed using the high-density color profile. A printed matter of a comparative example in which CMYK data was printed on the paper 40 was produced.

  Using the high-quality conversion color profile, the printed material printed with ink set SA is printed in Example 1, the printed material printed with ink set SB is printed in Example 2, the printed material printed with ink set SC is printed in Example 3, and ink set SD is printed. The printed matter is Example 4. Using the color profile for high density, the printed matter printed with the ink set SA is Comparative Example 1, the printed matter printed with the ink set SA is Comparative Example 2 (that is, Comparative Example 1 and Comparative Example 2 are the same), and the Ink Set SB The printed matter printed is Comparative Example 3, and the printed matter printed with the ink set SC is Comparative Example 4.

  A heat set offset printing machine (LITHOPIABT2-800NEO, manufactured by Mitsubishi Heavy Industries, Ltd.) was used as the printing machine 20, and overprinting was performed under the following printing conditions.

<Printing conditions>
Paper: Pearl Coat N (coated paper 65.5 g / m ² manufactured by Mitsubishi Paper Industries Co., Ltd.)
Printing speed: 300rpm
Chiller set temperature: 25 ° C
Paper surface temperature after passing through the dryer: 95 ° C
Version: CTP version (Fuji Film Co., Ltd.)
Number of copies: 20,000 copies Dampening solution: AQUAUNITY WKK 20KG GN 2% (manufactured by Toyo Ink Co., Ltd.)
Printing order: K → C → M → Y

The obtained printed matter was evaluated for gloss, friction resistance, and color as follows.
<Glossy>
Using a gloss meter (GM26D, manufactured by Murakami Color Research Co., Ltd.), the gloss of the dot overlap portion of the obtained printed matter was measured. The practical level of the measured value is “60” or more. If there is a difference of 5 points or more in measured values, the difference can be clearly confirmed visually. The halftone dot overlapping portion is a portion printed by overlapping all the inks used for producing the printed material.

<Abrasion resistance>
The friction resistance test was performed by combining lap coat N (65.5 g / m ² ) (manufactured by Mitsubishi Paper Industries Co., Ltd.) with all the color overlap parts of the printed matter, The product was manufactured under the conditions of a load of 200 g and 10 reciprocations. In the evaluation, the amount of ink attached to the white paper was visually determined. The case where the degree of adhesion was poor was set to 1, and the case where the degree of adhesion was good was set to 5, and a five-step evaluation was performed based on the following criteria. In addition, evaluation of Examples 1-4 was implemented on the basis of whether it corresponds to any of "1"-"5" when the result of Comparative Examples 1-4 is set to "3", respectively. That is, the evaluation standard of Example 1 is Comparative Example 1, the evaluation standard of Example 2 is Comparative Example 2, the evaluation standard of Example 3 is Comparative Example 3, and the evaluation standard of Example 4 is Comparative Example 4.

(Evaluation criteria)
1: Clearly much ink adheres to white paper.
2: There is much adhesion of ink with respect to white paper.
3: Normal ink adhesion to white paper.
4: Less ink adheres to white paper.
5: Ink hardly adheres to white paper.

<Color evaluation>
For the color evaluation, for 10 subjects, the printed materials of Examples 1 to 4 and the printed materials of Comparative Examples 1 to 4 were shown side by side without showing which was an example or a comparative example. It was judged by sensory evaluation. Evaluation was performed according to the following comprehensive evaluation criteria from the viewpoint of the vividness of the pattern, the texture of printing, and the reproducibility of human skin.

(Comprehensive evaluation)
A: The printed matter of Example has higher quality.
B: The printed matter of the comparative example has higher quality.
C: There is no difference in quality between the printed materials of the example and the comparative example.

  The above performance evaluation results are shown in FIG. As shown in FIG. 21, the printed materials of Examples 1 to 4 have the same or superior color evaluation as the printed materials of Comparative Examples 1 to 4. As described above, in the present embodiment, it was confirmed that a high-quality printed product can be obtained even when a standard density ink set having a pigment concentration lower than that of the high density ink set is used. The printed materials of Examples 2 to 4 are superior in friction resistance to the printed materials of Comparative Examples 2 to 4. Moreover, the printed matter of Examples 2-4 is superior to the printed matter of Comparative Examples 2-4 in glossiness. Thus, in this embodiment, there is an unexpected effect that the friction resistance and the gloss are improved.

Second Embodiment
In the printing system of the second embodiment shown in FIG. 22, the same parts as those in FIG. In the printing system of the second embodiment, the printing color conversion unit 10 has L ^* , a ^* , b ^* .CMYK color profiles CP2 and CP3. Hereinafter, L ^* , a ^* , b ^* .CMYK color profiles CP2 and CP3 are abbreviated as color profiles CP2 and CP3.

  The color profile CP2 is the same second color profile as the color profile CP2 shown in FIG. The color profile CP3 is a third color profile. The profiles CP3g, CP3b, and CP3r shown in FIGS. 2A, 4A, and 6A are extracted from profiles of some hues of the color profile CP3.

  The printing system of the second embodiment includes ink sets 30A and 30B, and the printing machine 20 selectively uses the ink sets 30A and 30B to generate a color image based on CMYK data output from the printing color conversion unit 10. It is configured to print on the paper 40. The ink set 30A is a high density ink set, and the ink set 30B is a standard density ink set.

  For example, if the ink set 30A is the ink set SA described above, the ink set 30B is the ink set SB described above. If the ink set 30A is the ink set SB, the ink set 30B is the ink set SC described above. If ink set 30A is ink set SC, ink set 30B is ink set SD described above.

  When the printing machine 20 performs printing using the ink set 30A, the printing color conversion unit 10 refers to the color profile CP3 and sets the R, G, B values of each color signal of RGB actual data to C, M, Y, CMYK data converted into K values is generated and supplied to the printing machine 20.

  When the printing machine 20 performs printing using the ink set 30B, the printing color conversion unit 10 refers to the color profile CP2 and sets the R, G, B values of each color signal of RGB actual data to C, M, Y, CMYK data converted into K values is generated and supplied to the printing machine 20.

  According to the printing system, the printing method, and the printed matter manufacturing method of the second embodiment, a high-quality printed matter can be obtained by using the ink set 30A. Moreover, according to the printing system, printing method, and printed matter manufacturing method of the second embodiment, even if the ink set 30B is used, there is almost no discoloration with the ink set 30A, and a high-quality printed matter is obtained. Can do.

<Modification>
In the printing systems of the first and second embodiments described above, the printing color conversion unit 10 may be configured by a computer. FIG. 23 shows a modification in which the printing color conversion unit 10 is configured by a computer.

  In FIG. 23, a computer 50 includes a central processing unit 51 (hereinafter referred to as CPU 51) and a storage unit 52. The CPU 51 receives RGB data including the RGB actual data and the color profile CP1. The storage unit 52 stores a printing color conversion program. The storage unit 52 is a ROM, a hard disk drive, or the like. The printing color conversion program is a computer program that describes an instruction to convert RGB actual data into CMYK data based on the color profile CP2 (or CP3).

  The CPU 51 executes the printing color conversion program to convert the RGB actual data into CMYK data and supplies it to the printing machine 20. Although not shown in FIG. 23, the printing machine 20 prints on the paper 40 using the ink set 30 (or the ink set 30A or 30B).

  As described above, according to the printing system, the printing method, and the printed matter manufacturing method of the first and second embodiments, a high-quality printed matter can be obtained even when the standard pigment concentration ink is used. That is, according to the printing system, the printing method, and the printed material manufacturing method of the first and second embodiments, a high-quality printed material can be obtained without increasing the pigment concentration more than necessary.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the present invention. Instead of holding the high-quality conversion color profile, the printing color conversion unit 10 holds the high-density color profile, and the C, M, Y, and K values read from the high-density color profile are used as the high-quality conversion color profile. It is also possible to configure to convert into corresponding C, M, Y, K values.

  In this case, the C, M, Y, and K values read from the color profile for high density are determined according to the pigment density of the C, M, and Y inks in the ink set 30, and the degree of increase in necessary colors and the degree of increase in complementary colors. Alternatively, it is possible to change the position of the intermediate density at which the degree of decrease and the decrease in complementary color start.

DESCRIPTION OF SYMBOLS 10 Color conversion part for printing 20 Printing machine 30, 30A, 30B Ink set 40 Paper 41 Printed matter 50 Computer 51 Central processing unit 52 Memory | storage part

Claims (12)

RGB actual data composed of additive color-mixed red, green, and blue color signals, R, G, and B values indicating the levels of the color signals of the RGB actual data and L ^* a ^* b ^* color system L ^* , a RGB data including a first color profile indicating a correspondence relationship between ^* and b ^* values is input, and L ^* , a ^* , b ^* values of the L ^* a ^* b ^* color system and subtractive cyan, With reference to the second color profile indicating the correspondence with the C, M, Y, and K values indicating the levels of the color signals of magenta, yellow, and black, the R, G, and B values are set in the first color profile. The L ^* , a ^* , b ^* values that are closest to the associated L ^* , a ^* , b ^* values are selected from the second color profile, and the selected L ^* , a ^* , b ^* values By outputting C, M, Y, and K values corresponding to the R, G, and B values of each color signal of the RGB actual data. Y, a print color conversion unit that generates a first CMYK data converted into K value,
A first ink set comprising cyan, magenta, yellow having a first pigment concentration and black ink having a predetermined pigment concentration;
A printing machine that prints an image based on the first CMYK data on paper using the first ink set;
With
The target density of an image printed on the paper by printing by the printing machine is referred to a third color profile indicating a correspondence relationship between L ^* , a ^* , b ^* values and C, M, Y, K values. Thus, the L ^* , a ^* , b ^* values that are closest to the L ^* , a ^* , b ^* values associated with the R, G, B values in the first color profile are changed to the third color profile. The R, G, B values of each color signal of the RGB actual data are set to C, by outputting the C, M, Y, K values corresponding to the selected L ^* , a ^* , b ^* values. The second CMYK data converted into M, Y, and K values are converted into cyan, magenta, yellow having a second pigment concentration higher than the first pigment concentration, and black ink having a predetermined pigment concentration. A mark expressed on the paper when printed on the paper using a second ink set containing And concentration,
The printing color conversion unit, as the second color profile, out of the C, M, Y, K values of the respective colors in the first hue range including green and blue, in the third color profile. Compared with the C, M, Y, and K values of the respective colors in the first hue range, the values of the necessary colors in the range from the low density side to the high density side of each color in the first hue range are obtained. Increasing the complementary color value from the low density side of each color in the first hue range to a predetermined intermediate density between the low density side and the high density side, and if the intermediate density is exceeded, the complementary color value is increased. A printing system characterized by referring to a color profile set so as to reduce the color. The printing color conversion unit, as the second color profile, out of the C, M, Y, and K values of each color in the second hue range including red, the second color profile in the third color profile. Compared with the C, M, Y, and K values of the respective colors in the hue range, the necessary color value is increased in the range from the low density side to the high density side of each color in the second hue range. The complementary color value is not increased or decreased from the low density side of each color in the second hue range to a predetermined intermediate density between the low density side and the high density side. The printing system according to claim 1, wherein a color profile set to decrease the value is referred to. The printing color conversion unit replaces a part of C, M, and Y values with K values when the second color profile exceeds a predetermined intermediate density between the low density side and the high density side. printing system according to claim 1 or 2, characterized in that referring to the profile. Further comprising the second ink set;
The printing color conversion unit includes the second and third color profiles;
In the printing machine, when the printing color conversion unit generates the first CMYK data with reference to the second color profile, an image based on the first CMYK data is displayed on the first ink set. When the printing color conversion unit generates the second CMYK data with reference to the third color profile, an image based on the second CMYK data is displayed on the second ink. printing system according to any one of claims 1 to 3, characterized in that printed on the paper using the set. RGB actual data composed of additive color-mixed red, green, and blue color signals, R, G, and B values indicating the levels of the color signals of the RGB actual data and L ^* a ^* b ^* color system L ^* , a An RGB data input step of inputting RGB data including a first color profile indicating a correspondence relationship between ^* and b ^* values;
The correspondence between the L ^* , a ^* , b ^* values of the L ^* a ^* b ^* color system and the C, M, Y, K values indicating the levels of the subtractive cyan, magenta, yellow, and black color signals. Referring to the second color profile shown, L ^* , a ^* , b that most closely approximates the L ^* , a ^* , b ^* values associated with the R, G, B values in the first color profile. ^By selecting a ^* value from the second color profile and outputting C, M, Y, and K values corresponding to the selected L ^* , a ^* , and b ^* values, each color signal of the RGB actual data is output. A CMYK data generation step of generating first CMYK data obtained by converting R, G, B values into C, M, Y, K values;
A printing step of printing an image based on the first CMYK data on a sheet using a first ink set including cyan, magenta, yellow having a first pigment density and black ink having a predetermined pigment density; ,
Including
The target density of the image printed on the paper in the printing step is referred to the third color profile indicating the correspondence between the L ^* , a ^* , b ^* values and the C, M, Y, K values. The L ^* , a ^* , and b ^* values that are closest to the L ^* , a ^* , and b ^* values associated with the R, G, and B values in the first color profile are obtained from the third color profile. By selecting and outputting C, M, Y, and K values corresponding to the selected L ^* , a ^* , and b ^* values, the R, G, and B values of each color signal of the RGB actual data are converted to C, M The second CMYK data converted into the Y, K values are converted into cyan, magenta, yellow having a second pigment density higher than the first pigment density and black ink having a predetermined pigment density. A print density expressed on the paper when printed on the paper using a second ink set comprising:
In the CMYK data generation step, as the second color profile, among the C, M, Y, K values of the respective colors in the first hue range including green and blue, the third color profile in the third color profile Compared with the C, M, Y, and K values of the respective colors in the first hue range, the values of the necessary colors in the range from the low density side to the high density side of each color in the first hue range are obtained. Increasing the complementary color value from the low density side of each color in the first hue range to a predetermined intermediate density between the low density side and the high density side, and if the intermediate density is exceeded, the complementary color value is increased. When the image based on the first CMYK data is printed on the paper using the first ink set in the printing step by referring to the color profile set so as to reduce the paper Printing method characterized by bringing the printing density to be expressed in the target density in. In the CMYK data generation step, as the second color profile, out of the C, M, Y, and K values of each color in the second hue range including red, the second color profile includes the second color profile. Compared with the C, M, Y, and K values of the respective colors in the hue range, the necessary color value is increased in the range from the low density side to the high density side of each color in the second hue range. The complementary color value is not increased or decreased from the low density side of each color in the second hue range to a predetermined intermediate density between the low density side and the high density side. By referring to a color profile set so as to decrease the value, an image based on the first CMYK data is printed on the paper using the first ink set in the printing step. The printing method according to claim 5, characterized in that close the print density to be expressed in the target density.   In the CMYK data generation step, when the second color profile exceeds a predetermined intermediate density between the low density side and the high density side, a part of C, M, Y values is replaced with a K value. The printing method according to claim 5 or 6, wherein a profile is referred to. RGB actual data composed of additive color-mixed red, green, and blue color signals, R, G, and B values indicating the levels of the color signals of the RGB actual data and L ^* a ^* b ^* color system L ^* , a An RGB data input step of inputting RGB data including a first color profile indicating a correspondence relationship between ^* and b ^* values;
The correspondence between the L ^* , a ^* , b ^* values of the L ^* a ^* b ^* color system and the C, M, Y, K values indicating the levels of the subtractive cyan, magenta, yellow, and black color signals. Referring to the second color profile shown, L ^* , a ^* , b that most closely approximates the L ^* , a ^* , b ^* values associated with the R, G, B values in the first color profile. ^By selecting a ^* value from the second color profile and outputting C, M, Y, and K values corresponding to the selected L ^* , a ^* , and b ^* values, each color signal of the RGB actual data is output. A CMYK data generation step of generating first CMYK data obtained by converting R, G, B values into C, M, Y, K values;
An image based on the first CMYK data is printed on a sheet using a first ink set including cyan, magenta, yellow having a first pigment concentration and black ink having a predetermined pigment concentration, and a printed matter is obtained. Printed matter manufacturing process to manufacture;
Including
The target density of an image printed on the paper in the printed material manufacturing process is referred to a third color profile indicating a correspondence relationship between L ^* , a ^* , b ^* values and C, M, Y, K values. Thus, the L ^* , a ^* , b ^* values that are closest to the L ^* , a ^* , b ^* values associated with the R, G, B values in the first color profile are changed to the third color profile. The R, G, B values of each color signal of the RGB actual data are set to C, by outputting the C, M, Y, K values corresponding to the selected L ^* , a ^* , b ^* values. The second CMYK data converted into M, Y, and K values are converted into cyan, magenta, yellow having a second pigment concentration higher than the first pigment concentration, and black ink having a predetermined pigment concentration. Print density expressed on the paper when printed on the paper using a second ink set containing And,
In the CMYK data generation step, as the second color profile, among the C, M, Y, K values of the respective colors in the first hue range including green and blue, the third color profile in the third color profile Compared with the C, M, Y, and K values of the respective colors in the first hue range, the values of the necessary colors in the range from the low density side to the high density side of each color in the first hue range are obtained. Increasing the complementary color value from the low density side of each color in the first hue range to a predetermined intermediate density between the low density side and the high density side, and if the intermediate density is exceeded, the complementary color value is increased. When the image based on the first CMYK data is printed on the paper using the first ink set in the printed matter manufacturing process by referring to the color profile set so as to reduce Method for producing a printed material, characterized in that to produce the prints the print density to be represented on paper as close to the target density. In the CMYK data generation step, as the second color profile, out of the C, M, Y, and K values of each color in the second hue range including red, the second color profile includes the second color profile. Compared with the C, M, Y, and K values of the respective colors in the hue range, the necessary color value is increased in the range from the low density side to the high density side of each color in the second hue range. The complementary color value is not increased or decreased from the low density side of each color in the second hue range to a predetermined intermediate density between the low density side and the high density side. By referring to the color profile set to decrease the value, when the image based on the first CMYK data is printed on the paper using the first ink set in the printed matter manufacturing process, Method for producing a printed matter according to claim 8, characterized in that the production of printed material that the printing density to be expressed on paper was brought close to the target density.   In the CMYK data generation step, when the second color profile exceeds a predetermined intermediate density between the low density side and the high density side, a part of C, M, Y values is replaced with a K value. The method for producing a printed matter according to claim 8 or 9, wherein a profile is referred to. RGB actual data consisting of additive color-mixed red, green, and blue color signals, and R, G, B values and L indicating the level of each color signal of the RGB actual data ^* a ^* b ^* Color system L ^* , A ^* , B ^* RGB data including a first color profile indicating a correspondence relationship with a value is input, and L ^* a ^* b ^* Color system L ^* , A ^* , B ^* Referring to the second color profile indicating the correspondence between the value and the C, M, Y, K values indicating the levels of the subtractive color signals of cyan, magenta, yellow, and black, the first color profile L associated with R, G, B values ^* , A ^* , B ^* L closest to the value ^* , A ^* , B ^* The value is selected from the second color profile, and the selected L ^* , A ^* , B ^* By outputting C, M, Y, and K values corresponding to the values, the first CMYK data obtained by converting the R, G, and B values of each color signal of the RGB actual data into C, M, Y, and K values is obtained. A color conversion unit for printing to be generated;
A printing machine for printing an image based on the first CMYK data on a sheet using a first ink set including cyan, magenta, yellow having a first pigment density and black ink having a predetermined pigment density; ,
With
The target density of an image printed on the paper by printing by the printing machine is set to L ^* , A ^* , B ^* Referring to the third color profile indicating the correspondence between the value and the C, M, Y, K value, L corresponding to the R, G, B value in the first color profile. ^* , A ^* , B ^* L closest to the value ^* , A ^* , B ^* A value is selected from the third color profile, and the selected L ^* , A ^* , B ^* By outputting C, M, Y, K values corresponding to the values, second CMYK data obtained by converting the R, G, B values of each color signal of the RGB actual data into C, M, Y, K values is obtained. And printing on the paper using a second ink set comprising cyan, magenta, yellow having a second pigment concentration higher than the first pigment concentration and black ink having a predetermined pigment concentration Sometimes the print density expressed on the paper,
The printing color conversion unit, as the second color profile, out of the C, M, Y, K values of the respective colors in the first hue range including green and blue, in the third color profile. Compared with the C, M, Y, and K values of the respective colors in the first hue range, the values of the necessary colors in the range from the low density side to the high density side of each color in the first hue range are obtained. Increasing the complementary color value from the low density side of each color in the first hue range to a predetermined intermediate density between the low density side and the high density side, and if the intermediate density is exceeded, the complementary color value is increased. Refer to the color profile set to decrease
A printing system characterized by that. The printing color conversion unit, as the second color profile, out of the C, M, Y, and K values of each color in the second hue range including red, the second color profile in the third color profile. Compared with the C, M, Y, and K values of the respective colors in the hue range, the necessary color value is increased in the range from the low density side to the high density side of each color in the second hue range. The complementary color value is not increased or decreased from the low density side of each color in the second hue range to a predetermined intermediate density between the low density side and the high density side. 12. The printing system according to claim 11, wherein a color profile set so as to decrease the value is referred to.

Images