JP4720208B2 - Color bar, printing press control method and printing press control device - Google Patents

Description

  The present invention relates to a color bar for controlling the balance of color tone regardless of the type of ink, and a printing press control method and a printing press control apparatus using the color bar.

  Conventionally, as an example of a print quality management technique, there is a technique in which a color bar for print quality management is printed on a printing paper, and this color bar is measured and determined.

  In a commonly used color bar, solid patches of each color of cyan (indigo color; C), magenta (red color; M), yellow (yellow color; Y), and black (black color; K), which are basic colors for printing ( A patch having a dot area ratio of 100%) is arranged. The color bar is used to determine whether the color tone data measured for the solid patch is within a preset target color tone range. That is, the quality of the printed matter is maintained by controlling the printing press so that the color tone value measured from the solid patch becomes a preset target value.

  In the printing press control method using a general color bar in which the solid patch is arranged, it is difficult to guarantee the printed pattern even though the solid reflection density can be guaranteed. That is, since it is difficult to manage the dot thickness due to dot gain, double, slur, etc., it is difficult to completely guarantee the print quality. In particular, it is difficult to manage the color tone of the portion (the halftone dot area ratio is 50% or less and around 50%) that is greatly affected by the thickening of the halftone dots.

  Therefore, in order to manage the effects of these dot gains, doubles, and slurs, in addition to the solid patches of cyan, magenta, yellow, and black in the color bar, fluctuations in the dot gains of four colors of cyan, magenta, yellow, and black A color bar has also been proposed in which patches for inspecting quantities and patches for inspecting doubles and slurs are arranged.

  However, with this printing press control method using color bars, it is very difficult to change the amount of dot gain, double, and slur generation during printing even if the occurrence of dot gain, double, and slur can be detected. It is difficult to. Moreover, the generation amount is constantly changing.

  Therefore, as a method for solving such a problem, a method for adjusting the color tone by measuring the density of a single color patch having a dot area ratio of 60% to 85% instead of a solid patch of cyan, magenta, yellow and black. Has been studied.

  In this method, the change in color tone from the light portion to the intermediate portion caused by dot gain, double, and slur can be reduced as compared with a printing press control method using a solid patch color bar.

On the other hand, there is a printing press control method for controlling a color tone of a printing press by configuring a gray patch in which three dots of cyan, magenta, and yellow are combined on a color bar and measuring the gray patch (for example, , See Patent Document 1).
JP 2000-127348 A

  A wide variety of brands are used as printing materials even for basic cyan, magenta, yellow and black inks, usually called process inks. Therefore, even for the same cyan, magenta, yellow, and black, the hue, dot gain, and ink trapping change depending on the ink brand. In particular, when two or three colors are superimposed, the difference in hue due to the ink brand is large.

  Therefore, only by the method of managing the color tone of the single color patch having the halftone dot area ratio of 60% to 85% with a preset target, the color tone depending on the type of ink when two colors and three colors are superimposed is changed. It is difficult to completely eliminate the difference.

  Further, in the method using the gray patch as described in Patent Document 1, the density of each color of cyan, magenta, yellow, and black cannot be measured, and it is necessary to use a dedicated print tone control circuit.

  However, since there is no patch to be compared in visual recognition of gray, it is difficult to avoid variations in judgment of color tone deviation by a person who performs visual inspection.

  The present invention has been made in view of the above circumstances, and provides a color bar used for controlling the balance of color tone regardless of the type of ink, a printing press control method using the color bar, and a printing press control device. The purpose is to do.

According to a first aspect of the present invention, in the color bar printed by the printing machine in order to manage the color tone of a four-color ink printing machine of cyan, magenta, yellow, and black, the dot area ratio is 75% to 85% cyan, magenta, yellow, and black flat mesh patches, and halftone dots with a halftone dot area ratio of 25% ± 8% that belong to the light portion, and magenta, A first combination of a first gray patch formed by multiplying a yellow flat screen so as to be gray and a first comparison black patch having the same level of brightness as the first gray patch; A second gray formed by multiplying a halftone dot of cyan halftone dot belonging to the middle portion and a halftone dot area ratio of 50% ± 8% with a magenta and yellow flat halftone dot so as to become gray. With patches A first area in which the combination of both the second gray patch and the second combination of the second comparative black patch having the same level of brightness as one ink key width is arranged within one ink key width of the printing press. The second gray patch, the flat halftone patch of each color having a dot area ratio of 75% to 85%, the first gray patch, and the first comparison black patch are arranged in an ink key of the printing press. The first gray patch and the halftone dot patch of each color having a halftone dot area ratio of 75% to 85% in a second region adjacent to the first region and having a width of one ink key. , A color bar having a configuration in which the second gray patch and the second comparison black patch are arranged in an ink key arrangement direction of the printing press .

  By using this color bar, it is possible to easily determine whether the color balance is good or not, and to control the color tone balance regardless of the type of ink.

Also, by arranging the gray patches and black patches, it can be easily performed even visually compares the grayed Reipatchi and black patches.

Further, in the light part and the intermediate part, it can be easily determined visually whether or not the gray patch has saturation, and whether the color balance is good or not can be easily determined visually.

  An intermediate area of the halftone dot area ratio is defined as an intermediate area, and an area having a lower halftone dot area ratio than the intermediate area is defined as a write area. Specifically, a cyan halftone dot whose halftone dot area ratio belongs to the light portion means a halftone dot having a halftone dot area ratio of 25% ± 8%, preferably a halftone dot of 25% ± 5%. . The cyan halftone dot whose halftone dot area ratio belongs to the middle part means a halftone dot having a halftone dot area ratio of 50% ± 8%, preferably a halftone dot of 50% ± 5%. By forming such gray patches in the light part and the intermediate part, it becomes possible to control the part where the influence of the thickening of the halftone dot is large.

In addition, by using this color bar, it is possible to easily determine whether the color balance is good or not, and it is also possible to easily determine the change in color tone from the light part to the intermediate part caused by dot gain, double, or slur. Regardless of the color tone, it is possible to control the color tone balance.

Invention corresponding to claim 2, when accepting the printing press control method using a color bar corresponding to claim 1, the indication of the color bar printed for the previous SL printing machine, for the color bar, the network Among the flat patches of each color having a dot area ratio of 75% to 85%, the density values of cyan and black flat patches are measured, and the measured density values of the cyan and black flat patches are During printing, the ink key of the printing machine is adjusted so that it falls within the preset cyan and black print quality control standard density range, and the first gray patch and the second gray patch are preset. The magenta and yellow ink keys of the printing press are adjusted so that it can be determined that the quality control standard is gray, and the dot area ratio is 7 respectively. The density values of magenta and yellow flat patches are measured out of the flat mesh patches of each color of% to 85%, and printing of magenta and yellow is performed based on the density values measured for the magenta and yellow flat patches. A quality control reference density range is set, and after the color bar is printed, the density values of magenta and yellow plain mesh patches in the reproduction color bar printed by the printer and having the same configuration as the color bar are measured, and the reproduction color A printing press control method for adjusting an ink key of the printing press so that density values of magenta and yellow flat mesh patches in a bar are within the print quality control reference density range.

  Accordingly, it is possible to easily determine the color tone bias regardless of the type of ink.

Corresponds to claim 3 invention is a printing press control method corresponding to Claim 2, it can be determined and said first gray patch and the second gray patch is gray print quality control standards that are set in advance The adjustment of the magenta and yellow ink keys of the printing machine so as to become, for the first gray patch and the first comparison black patch, comparing at least one of brightness and chromaticity, For the second gray patch and the second comparison black patch, at least one of brightness and chromaticity is compared, and the first gray patch and the second gray patch are adjacent to each other. The magenta and yellow ink keys should be gray so as to approximate the comparison black patch and the second comparison black patch. A printer control method implemented by the integer.

In the invention corresponding to claim 3 , in addition to the operation corresponding to claim 2 , gray having no saturation can be easily formed.

Invention corresponding to claim 4 is the printed material printed with color bar corresponding to claim 1, wherein the color bar is printed material before Symbol first region and the second region are repeated.

  By performing printing control using this printed matter, the balance of color tone can be controlled regardless of the type of ink.

Corresponding to claim 5 invention, a printing press control device for controlling the printing press using the color bar corresponding to claim 1, the previous SL cyan and density value measured with the tint patches of black First ink key adjusting means for adjusting to be within a preset reference density range, and after the first ink key adjusting means, the saturation of the first gray patch and the saturation of the second gray patch are set to zero. And a second ink key adjusting means for adjusting the magenta and yellow ink keys so as to fall within an allowable range determined by the printing press controller.

Further, invention corresponding to claim 6, color bar printed that instructs the printing press control device for controlling the printing press using the color bar corresponding to claim 1, the printing of the color bar before Symbol printing machine Instructing means, density measuring means for measuring the density of each patch of the color bar, and density values of the cyan and black flat mesh patches measured by the density measuring means so as to fall within a preset reference density range The first ink key adjusting means for adjusting the cyan and black ink keys, and after the adjustment by the first ink key adjusting means, the saturation of the first gray patch and the saturation of the second gray patch are determined based on zero. This is a printing press control device comprising a second ink key adjusting means for adjusting magenta and yellow ink keys so as to fall within an allowable range.

In the printing press control device corresponding to the fifth and sixth aspects, the balance of color tone can be controlled regardless of the type of ink.

Invention corresponding to claim 7 is the printing press control device for controlling the printing press using the color bar corresponding to claim 1, for the black patches before Symbol said first comparator and the first gray patches, lightness Brightness chromaticity measuring means for measuring at least one of brightness and chromaticity for the second gray patch and the second comparison black patch, and the brightness color and at least one of the brightness value and the chromaticity values of the first gray patches measured by the degree measuring means, as well as comparing the at least one of the brightness value and the chromaticity values of the first comparative black patch , At least one of the lightness value and the chromaticity value of the second gray patch measured by the lightness and chromaticity measuring means, the lightness value and the chromaticity value of the second comparison black patch, Out by comparing the at least one result of the comparison, adjustment when the difference of one is not within the allowable range, so that the density value of each color tint patches falls to the reference concentration range that is set for each color And a printing press control device including an ink key adjusting means.

  Thereby, the balance of color tone can be controlled during printing regardless of the type of ink.

  According to the present invention, the balance of color tone can be controlled regardless of the type of ink, the influence of printing materials and atmospheric factors can be eliminated, and the quality of printed matter can be stabilized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a schematic diagram showing an example of the configuration of a color bar according to the first embodiment of the present invention.

  As shown in FIG. 2, the color bar 10 is normally printed in the color bar printing area 12 in the margin of the printing paper 11.

  Here, the management patches of four colors of the cyan patch C80, the magenta patch M80, the yellow patch Y80, and the black patch K80 having a halftone dot area ratio of 75% to 85% respectively, and the cyan dot area ratio of cyan belonging to the light portion. A first gray patch G25 obtained by multiplying halftone dots by magenta and yellow halftone dots, a first comparison black patch K25 having a lightness equal to that of the first gray patch G25, and a cyan dot whose halftone dot area ratio belongs to the middle portion A total of eight types of patches are used: a second gray patch G50 obtained by multiplying halftone dots with magenta and yellow halftone dots, and a second comparison black patch K50 having the same brightness as the second gray patch G50.

  Specifically, an area of the ink key 21X width of the printing press 20 is divided into first to seventh patch areas 13A to 13G, and areas within the other ink key 21Y width adjacent to the area within the ink key 21X width are Divided into eighth to fourteenth patch regions 13H to 13N. Then, 14 patches are taken as one set, and this combination is repeatedly printed in the arrangement direction of the ink keys 21 of the printing press.

  First, the second gray patch G50 is arranged in the first patch region 13A.

  Then, any one of the cyan patch C80, the magenta patch M80, the yellow patch Y80, and the black patch K80, which is a management patch, is arranged in any of the second to fifth patch regions 13B to 13E.

  Further, the first gray patch G25 is arranged in the sixth patch region 13F.

  Then, the first black patch K25 is arranged in the seventh patch region 13G.

  Further, the first gray patch G25 is arranged in the eighth patch region 13H.

  Then, any one of the cyan patch C80, the magenta patch M80, the yellow patch Y80, and the first black patch K80, which is a management patch, is arranged in any of the ninth to twelfth patch areas 13I to 13L.

  Further, the second gray patch G50 is arranged in the thirteenth patch area 13M.

  Then, the second black patch K50 is arranged in the fourteenth patch area 13N.

As the brightness management value, any of L ^* a ^* b ^* color system, XYZ color system, Lch, RGB display system, etc. may be adopted, and reflection density as a substitute characteristic may be used. Here, the L ^* a ^* b ^* color system is used. The brightness is represented by L ^* .

  Further, the first gray patch G25 and the first comparison black patch K25 or the second gray patch G50 and the second comparison gray patch K50 have the same brightness. As long as it can be recognized as the brightness of the level, it does not have to be exactly the same brightness.

  Note that the above-described arrangement of patches is an example, and the method of repeatedly arranging the ink keys in the arrangement direction is not limited to this.

  In addition, since the width of one ink key 21 differs depending on the model of the printing press 20, it is not necessarily limited and is about 30 to 40 mm. Further, since the width of the patch area 13 that can be measured is not limited, the number of patches within one ink key 21 width is not necessarily seven. For this reason, it is possible to further increase the double / slur management patch and the like to an area within the width of the ink keys 21X and 21Y.

  Next, a method for creating a color bar having the above configuration will be described.

  First, the cyan and black ink keys in the printing press 20 are adjusted.

  Subsequently, a setting is made so that cyan halftone dots having a dot area ratio of 25% are printed.

  Next, the first gray patch G25 is formed by multiplying a cyan halftone dot having a halftone dot area ratio of 25% by a magenta and yellow halftone dot.

That is, the magenta and yellow ink keys are adjusted so as to cancel the saturation for gray G1 and G2 having saturation. Specifically, as shown in FIG. 3, in the L ^* a ^* b ^* color system, magenta and yellow meshes that are gray (center point) with respect to grays G1 and G2 having saturation. Set to point area ratio. In the L ^* a ^* b ^* color system, chromaticity indicating hue and saturation is represented by a ^* and b ^* . The saturation is represented by {(a ^* ) ² + (b ^* ) ² } ^1/2 , and the color becomes brighter as the value increases, and the color becomes dull as it becomes the center.

Subsequently, the brightness of the first gray patch G25 in the L ^* a ^* b ^* color system is measured.

  Next, the halftone dot area ratio of the first comparison black patch K25 having the same brightness as that of the first gray patch G25 is obtained.

  Similarly, the second gray patch G50 is formed by multiplying a cyan halftone dot having a halftone dot area ratio of 50% by a magenta halftone dot.

  Then, the dot area ratio of the second comparison black patch K25 is obtained.

  The magenta and yellow halftone dot area ratios of the first gray patch G25 and the second gray patch G50 and the halftone dot area ratios of the first comparison black patch K25 and the second comparison black patch K50 are determined by the above-described procedure. Then, the color bar is adjusted so as to satisfy the halftone dot area ratio, and the color bar 10 is created.

  As described above, according to the present embodiment, the gray patch G25 or G50 formed by the halftone dots of cyan, magenta, and yellow and the black patch K25 or K50 having the same brightness as the gray patch G25 or G50 are provided. With this configuration, it is possible to easily determine whether the color balance is good or bad. That is, it is possible to provide the color bar 10 that can control the balance of color tone regardless of the type of ink.

  Further, since the gray patches G25 and G50 and the black patches K25 and K50 are arranged adjacent to each other, the comparison between the gray patches G25 and G50 and the black patches K25 and K50 can be easily performed visually.

  Supplementally, when the color balance of the printing press 20 is lost, the operator starts to feel a difference in brightness and chromaticity between the gray patch G25 or G50 and the comparative black patch K25 or K50 in visual monitoring. Here, in the printing operation, it is required to quickly determine the quality of the color visually by the operator, but the gray patch G25 or G50 and the comparative black patch K25 or K50 are easily and easily formed by the adjacent color bar 10. It is possible to quickly determine whether the color balance is good or bad.

  Further, as a gray patch, at least a first gray patch G25 formed by multiplying a cyan halftone dot whose halftone dot area belongs to the light part and a magenta and yellow flat halftone dot, and a halftone dot area ratio in the middle part. Since the second gray patch G50 formed by multiplying the cyan halftone dots to which the magenta and yellow halftone dots belong is printed, whether or not the gray patches have saturation in the light portion and the intermediate portion. This can be easily determined visually.

  Also, cyan, magenta, yellow, and black color flat patches C80, M80, Y80, and K80, the first gray patch G25, the first comparison black patch K25, the second gray patch G50, and the second comparison patch. Since the black patch K50 is printed, it is possible to easily determine whether the color balance is good or not, and it is also possible to easily determine the change in color tone from the light part to the intermediate part caused by dot gain or double blur.

  Further, the second gray patch G50, cyan, magenta, yellow, and black flat mesh patches C80, M80, Y80, and K80, and the first gray patch G50 are arranged in the arrangement direction of the plurality of ink keys 21 in the printing machine 20 within the printing paper surface. The gray patch G25 and the first comparison black patch K25 are arranged within one ink key width, and the first gray patch G25 and the flat patch of each color of cyan, magenta, yellow, and black are arranged within the adjacent one ink key width. C80, M80, Y80, K80, the second gray patch G50, and the second comparison black patch K50 are arranged, and this combination is repeatedly arranged and printed, so that the color tone balance can be achieved regardless of the type of ink. A color bar that can be controlled can be provided.

  In the present embodiment, the gray patch in the color bar for measuring and confirming the print quality on the printing paper surface can be used to improve the quality inspection of the printed matter and the quality control accuracy. It is possible to eliminate the difference in print materials and the color reproduction of printed matter due to dot gain, double, and slur.

<Second Embodiment>
FIG. 4 is a schematic diagram showing the structure of a printing press control apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part same as the already demonstrated part, and the overlapping description is abbreviate | omitted.

  The printing machine control device 30 controls the printing machine 20 by printing the color bar 10 on the printing machine 20, and includes a color bar printing instruction unit 31, a density measurement unit 32, a density setting unit 33, and ink key adjustment. Part 34.

  The color bar 10 includes a second gray patch G50 and a halftone dot obtained by multiplying a cyan halftone dot having a halftone dot area ratio in the middle portion by a magenta and yellow halftone dot in the arrangement direction of the plurality of ink keys of the printing machine 20. Four color management patches of cyan patch C80, magenta patch M80, yellow patch Y80, and black patch K80 each having an area ratio of 75% to 85%, and magenta, The first gray patch G25 and the first comparison black patch K25 having the same lightness as the first gray patch G25 are arranged within the width of the 1 ink key 21X by multiplying the yellow halftone dots, and within the width of the adjacent 1 ink key 21Y. The first gray patch G25, the cyan patch C80, the magenta patch M80, the yellow patch Y80, and the black patch K80. And patches for management, and the second gray patch G50, is obtained by printing a plurality repeatedly to combine the printing paper 11 between the first gray patch is equal luminosity second comparative black patches K50 of.

  The printing paper 11 is a paper that is color-printed by the printing machine 20, and the color bar 10 is printed in the margin.

  The printing machine 20 performs predetermined cyan, magenta, yellow, and black color printing on the printing paper 11. Here, the color bar 10 is printed on the printing paper 11 in response to an instruction from the printing instruction unit 31.

  The printing machine 20 includes a cyan printing unit 22A, a magenta printing unit 22B, a yellow printing unit 22C, and a black printing unit 22D. Printing is performed on the printing paper 11 for each color, thereby enabling color printing. ing.

  The print instruction unit 31 gives the printing machine 20 a print instruction for the color bar 10 and notifies the density measurement unit 32 that the color bar is printed.

  When the density measuring unit 32 receives information that the color bar is printed from the print instruction unit 31, the density measuring unit 32 measures the density of each patch of the printed color bar 10. The density is measured using a hand-held spectral colorimetry type colorimetry densitometer or the like. However, the method for measuring the concentration is not limited to this.

  The density setting unit 33 sets the management patch density value measured by the density measurement unit 32 as a print quality management reference density value, and notifies the ink key adjustment unit 34 of the set print quality management reference density value. . For cyan and black, print quality reference management density values are set in advance. As the management patches, four-color patches of a cyan patch C80, a magenta patch M80, a yellow patch Y80, and a black patch K80 each having a halftone dot area ratio of 75% to 85% are used.

  The ink key adjustment unit 34 adjusts the ink key 21 of the printing machine 20. Here, the ink key is adjusted so that the measured density value of the management patch falls within an allowable range determined from the print quality management reference density value set by the density setting unit 33.

  The ink key adjustment unit 34 includes a cyan ink key adjustment unit 34A, a magenta ink key adjustment unit 34B, a yellow ink key adjustment unit 34C, and a black ink key adjustment unit 34D, and can independently adjust ink keys of respective colors.

  Next, the operation of the printing press control apparatus 30 according to the present invention will be described with reference to FIG.

  In step S 1, the print quality management reference density values of the cyan patch C 80 and the black patch K 80 are set in the density setting unit 33.

  In other words, cyan patch C80, magenta patch M80, yellow patch Y80, and black patch K80 are used as print quality management patches in the plurality of color bars 10 printed on the printing paper, and cyan patch C80 and black patch K80 are the print quality. Is set as representative data.

  The print quality management reference density values of the cyan patch C80 and the black patch K80 can be set freely. Here, the cyan patch C80 and the black patch K80 are flat halftone patches having a dot area ratio of 75 to 85%, and the optical reflection density is about 0.9 to 1.0 in the case of general offset printing. is there.

  In step S2, the cyan ink key adjustment unit 34A and the black ink key adjustment unit 34D determine that the density values measured for the cyan patch C80 and the black patch K80 within the same ink key width are determined from the print quality management reference density value ( Hereinafter, the ink key is adjusted so as to be within the “print quality control reference density range”.

  That is, when the first gray patch G25 or the second gray patch G50 within a certain adjacent two ink key width is adjusted to gray having no saturation, the cyan patch C80 and the black patch K80 within the same ink key width. After the density value measured for the ink key is adjusted to fall within the print quality control reference density range by the opening degree of the ink key or the like, the magenta and yellow ink keys are adjusted.

  This is usually performed in the order of black, cyan, magenta, and yellow in printing. Therefore, magenta and yellow that are transferred onto the ink are affected by ink trapping. This is because the transition state is different between the magenta patch M80 and the yellow patch Y80, which are configured only by colors, and adjustment is difficult.

  In step S3, the magenta ink key adjustment unit 34B and the yellow ink key adjustment unit 34C adjust the ink keys so that the first gray patch G25 and the second gray patch G50 have no saturation.

  Here, in order to adjust to gray without saturation, the density value of the first gray patch G25 or the second gray patch G50 is measured, for example, by analyzing the main wavelength densities of cyan, magenta, and yellow. Is adjusted.

  The magenta and yellow ink keys are adjusted by adjusting the opening of the ink key, but the control method is not limited to this.

  Further, the handheld spectral colorimetric type colorimetric densitometer may be used for density measurement. However, the method for measuring the concentration is not limited to this.

  In step S4, the density measuring unit 33 measures the density values of the magenta patch M80 and the yellow patch Y80.

  That is, the density of the magenta patch M80 and the yellow patch Y80 when the first gray patch G25 or the second gray patch G50 becomes gray without saturation is measured.

  In step S5, the measured densities of the magenta patch M80 and the yellow patch Y80 are set in the density setting unit 34 as the print quality management reference density.

  That is, the measured density values of the magenta patch M80 and the yellow patch Y80 are used as the print quality control reference density of the magenta patch M80 and the yellow patch Y80 in the adjacent two ink keys where the first gray patch G25 or the second gray patch G50 is located. Use as

  Here, for the plurality of color bars 10 printed on the printing paper, the print quality management reference density of the magenta patch M80 and the yellow patch Y80 is set for each color bar 10. For this reason, the print quality management reference densities of the cyan patch C80 and the black patch K80 are each one on the printing paper surface, and the printing quality management reference densities of the magenta patch M80 and the yellow patch Y80 are plural on the printing paper surface.

  On the other hand, the magenta patch M80 and yellow patch Y80 of a certain color bar 10 are used as representative values on the printing paper surface, and the print quality control reference densities of all the printed magenta patches M80 and yellow patches Y80 of the color bar 10 are also used. good. At this time, the print quality management reference density of each of the cyan patch C80, the magenta patch M80, the yellow patch Y80, and the black patch K80 is one on the printing paper surface.

  Regardless of the print quality control reference density setting method, the color tone of the printing press is controlled based on the print quality control reference density.

  As described above, according to the present embodiment, the four-color management patch including the cyan patch C80, the magenta patch M80, the yellow patch Y80, and the black patch K80, the first gray patch G25, the first comparison black patch K25, and the second patch. The printing machine 20 is notified of a printing instruction for the color bar 10 including at least a total of eight types of patches including the gray patch G25 and the second comparison black patch K25, and the density of each patch of the color bar 10 is measured and the measured cyan The cyan and black ink keys are adjusted so that the density values of the patch C80 and the black patch K80 are within the print quality control reference density range.

  Then, the magenta and yellow ink keys are adjusted so that the saturation of the gray patches G25 and G50 falls within an allowable range determined based on zero.

  Thereby, the balance of color tone can be controlled regardless of the type of ink.

<Third Embodiment>
FIG. 6 is a schematic diagram showing the structure of a printing press control apparatus according to the third embodiment of the present invention.

  This embodiment is a modification of the second embodiment of the present invention, and includes a lightness and chromaticity determination unit 35 instead of the density setting unit 33 in the printing press control apparatus 30S.

  Here, the difference in operation of the printing press control apparatus 30S due to the incorporation of the lightness / chromaticity determination unit 35 will be mainly described.

  The lightness and chromaticity determination unit 35 compares the first gray patch G25 measured by the density measurement unit 32 and the first comparison black patch K25 with at least one of lightness and chromaticity, and the second gray patch. The patch G50 and the second comparative black patch K50 are compared with at least one of brightness and chromaticity. Here, in black ink, since brightness and density are proportional, it is possible to compare brightness by comparing density.

  If any of the brightness values does not match as a result of the comparison, the brightness determination unit 35 indicates that the cyan, magenta, and yellow balance (hereinafter referred to as “CMY balance”) of the gray patch G25 or G50 is broken. The ink key adjustment unit 34S is notified.

  When the lightness / chromaticity determination unit 35 receives a notification that the CMY balance is lost, the ink key adjustment unit 34S adjusts the ink key so that the density of the management patch becomes the print quality management reference density.

  As described above, in the present embodiment, the lightness and chromaticity determination unit 35 compares at least one of the lightness and chromaticity for the gray patch and the comparison black patch, and determines that they do not match as a result of the comparison. In this case, the configuration including the ink key adjustment unit 34S that adjusts the density of the management patch to the print quality management standard density of each color enables the color balance to be controlled regardless of the type of ink during printing. A printer control device using a bar can be provided.

  In this embodiment, the printing press 20 is controlled using the color bar 10 according to the present invention. Here, the effect of the present invention will be described from a comparison with a control method of the printing press 20 using a conventional color bar.

(1) Implementation Procedure First, the color bar 10 was printed using eight printing machines 20A to 20H having different printing materials and dot gains.

  Here, the color bar 10 is printed over the entire width of the printing paper 11, the position of the color bar 10 is matched with the ink key arrangement of each of the used printing presses 20A to 20H, and the patch width in the color bar 10 matches the ink key width. Adjusted.

  In the color bar 10, the dot area ratio of the cyan patch C80, the magenta patch M80, the yellow patch Y80, and the black patch K80, which are management patches, is set to 80%. The first gray patch was created based on a cyan halftone dot having a halftone dot area ratio of 25%, and the second gray patch was created based on a cyan halftone dot having a halftone dot area ratio of 50%.

  At the time of printing, preset densities were set as print quality management reference densities for the cyan patch C80 and the black patch K80.

  Subsequently, with the cyan and black ink keys managed, control was performed to make the gray saturation zero with magenta and yellow.

  Next, the first gray patch G25 and the second gray patch G50 in the color bar 10 were visually determined to determine the color tone deviation, and the magenta and yellow ink keys were controlled.

  At this time, the first gray patch G25 and the second gray patch G50 within a certain ink key width are controlled and the brightness of the first comparison black patch K25 or the second comparison black patch K50 is used. The 1 gray patch or the 2nd gray patch was compared, and the color tone deviation was visually judged to control the magenta and yellow ink keys.

  Next, the density of the magenta patch M80 and the yellow patch Y80 at the time when it was determined that the control target coincided with the first gray patch G25 or the second gray patch G50 was measured.

  Subsequently, the measured densities of the magenta patch M80 and the yellow patch Y80 were set as the print quality management reference densities of the magenta patch M80 and the yellow patch Y80 of all the printed color bars 10.

  Then, the printing presses 20A to 20H were controlled so as to satisfy the print quality control reference density set in this way.

(2) Comparison Object As a comparison object, printing press control using a color bar composed of solid patches of cyan, magenta, yellow, and black was performed. Here, one density is set for each color as the print quality control standard density for all color bars.

(3) Implementation Results According to the above implementation procedure, the brightness of the first comparison black patch K25 or the second comparison black patch K50, which is a sample of the printed matter printed by the controlled printing machine, is determined by a spectrophotometer. The result of measuring the color difference (CIELAB) from the printed material when the gray patch used at the time was created was as shown in FIGS.

  That is, as shown in FIG. 7, the control (a) using the color bar according to the present invention has a higher ratio of suppressing the color difference to 3 or less than the control (b) using the solid color bar. It has become.

  Further, as shown in FIG. 8, the control (a) using the color bar according to the present invention is smaller in the average value of the color difference than the control (b) using the solid color bar. It can be said that good printing is performed.

(4) Supplementary explanation In the above embodiment, the determination of the gray color tone deviation is made visually. This is because the printing operation requires printing 10,000 sheets or more per hour, so that the operator can visually determine the color tone bias regardless of the type of ink. This is because it is required to quickly determine whether the color balance is good or bad. Needless to say, the present invention satisfies the requirements. In addition, even with such visual judgment, it is possible to make a printed material of a medium or higher level for a young operator with low skills, which contributes to stabilization of the quality of the printed material. Needless to say.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine a component suitably in different embodiment.

It is a schematic diagram which shows an example of a structure of the color bar which concerns on the 1st Embodiment of this invention. It is a figure which shows the printing part of the color bar in the embodiment. It is the figure which showed the gray on the L ^* A ^* B ^* color system space in the same embodiment. It is a schematic diagram which shows the structure of the printing press control apparatus which concerns on the 2nd Embodiment of this invention. 3 is a flowchart for explaining the operation of the printing press control apparatus according to the embodiment. It is a schematic diagram which shows the structure of the printing press control apparatus which concerns on the 3rd Embodiment of this invention. It is the comparison figure which showed the ratio of the color difference in the execution example of this invention. It is the comparison figure which showed the average value of the color difference in the Example of this invention.

Explanation of symbols

    C80 ... Cyan patch, M80 ... Magenta patch, Y80 ... Yellow patch, K80 ... Black patch, G25 ... First gray patch, G50 ... Second gray patch, K25 ... 1st comparison black patch, K50 ... 2nd comparison black patch, 10 ... color bar, 11 ... printing paper, 12 ... color bar printing area, 13A-13N ... patch area, 20 ... Printing machine, 21 ... Ink key, 22A ... Cyan printing part, 22B ... Magenta printing part, 22C ... Yellow printing part, 22D ... Black printing part, 30 ... Printing Machine control device 31 ... Printing instruction unit 32 ... Density measuring unit 33 ... Density setting unit 34 ... Ink key adjusting unit 34A ... Cyan ink key adjusting unit 34B Magenta ink key adjustment portion, 34C ... Yellow ink key adjustment portion, 34D ... black ink key adjustment unit, 35 ... brightness chromaticity judging unit.

Claims (7)

In the color bar printed by the printing machine to manage the color tone of the printing machine of four color inks of cyan, magenta, yellow and black,
A flat halftone patch of each color of cyan, magenta, yellow and black having a halftone dot area ratio of 75% to 85%,
A halftone dot whose halftone dot area ratio is a cyan halftone dot belonging to the light portion and whose halftone dot area ratio is 25% ± 8% is formed by multiplying a magenta and yellow flat halftone dot so as to be gray. 1 and the gray patches, the a first combination of the first and the comparative black patches as a brightness of the first gray patch and the same level, the halftone dot area a dot of cyan dot percent belong to the middle section A second gray patch formed by multiplying a halftone dot having a rate of 50% ± 8% and a magenta and yellow flat mesh so as to be gray; and a second gray patch having the same level of brightness as the second gray patch. A combination of both a second combination with a comparative black patch within one ink key width of the printing press ;
The second gray patch, the flat halftone patch of each color having a halftone dot area ratio of 75% to 85%, the first gray patch, and the first comparison black patch are included in the first region having one ink key width. , And a configuration in which the ink keys of the printing machine are arranged in the arrangement direction,
In the second region adjacent to the first region and having one ink key width, the first gray patch, the flat mesh patch of each color having a dot area ratio of 75% to 85%, the second gray patch, the second 2 black patches for comparison, color bars, wherein the configuration der Rukoto by arranging the arrangement direction of the ink key of the printing press. In the printing press control method using the color bar according to claim 1 ,
When receiving an instruction to print the color bar to the printing machine,
For the color bar, among the flat patches of each color having a dot area ratio of 75% to 85%, the density values of cyan and black flat patches are measured,
Adjusting the ink key of the printing press during printing so that the density values measured for the cyan and black flat patch are within the preset cyan and black print quality control density ranges;
Adjusting the magenta and yellow ink keys of the printing machine so that it can be determined that the first gray patch and the second gray patch are preset printing quality control grays;
Measure the density value of the magenta and yellow flat mesh patches among the flat mesh patches of each color having a dot area ratio of 75% to 85%,
Set magenta and yellow print quality control standard density ranges based on the density values measured for the magenta and yellow plain mesh patches,
After printing the color bar, measure the density value of the magenta and yellow flat mesh patches in the reproduction color bar printed by the printer and having the same configuration as the color bar;
A printing press control method, wherein an ink key of the printing press is adjusted so that density values of magenta and yellow flat patches in the reproduction color bar fall within the print quality control reference density range. The printing press control method according to claim 2 ,
Adjustment of the magenta and yellow ink keys of the printing machine so that the first gray patch and the second gray patch can be determined to be gray of a preset print quality control standard,
For the first gray patch and the first comparison black patch, at least one of brightness and chromaticity is compared;
For the second gray patch and the second comparative black patch, at least one of brightness and chromaticity is compared,
The magenta and yellow ink keys are adjusted so that the first gray patch and the second gray patch are grays that approximate the adjacent first comparison black patch and the second comparison black patch, respectively. A printing press control method realized by the above. A printed matter obtained by printing the color bar according to claim 1 ,
The color bar is
The printed matter, wherein the first region and the second region are repeated. In the printing press control apparatus which controls the printing press using the color bar according to claim 1 ,
A first ink key adjustment means for adjusting to fit the reference concentration range density values the measured with the cyan and black tint patches are preset,
A second ink key for adjusting the magenta and yellow ink keys so that the saturation of the first gray patch and the saturation of the second gray patch are within an allowable range determined based on zero after the first ink key adjusting means; A printing press control apparatus comprising an adjusting means. In the printing press control apparatus which controls the printing press using the color bar according to claim 1 ,
Color bar print instruction means for instructing the printing machine to print the color bar;
Density measuring means for measuring the density of each patch of the color bar;
First ink key adjusting means for adjusting the cyan and black ink keys so that the density values of the cyan and black flat patches measured by the density measuring means fall within a preset reference density range;
After the adjustment by the first ink key adjusting means, the magenta and yellow ink keys are adjusted so that the saturation of the first gray patch and the saturation of the second gray patch are within an allowable range determined based on zero. A printing press control device comprising a two-ink key adjusting means. In the printing press control apparatus which controls the printing press using the color bar according to claim 1 ,
For the first gray patch and the first comparison black patch, at least one of brightness and chromaticity is measured ; for the second gray patch and the second comparison black patch, brightness and chromaticity; Brightness and chromaticity measuring means for measuring at least one of
And at least one of the brightness value and the chromaticity values of the first gray patches measured by the brightness chromaticity measuring means, and at least one of the brightness value and the chromaticity values of the first comparative black patch And comparing at least one of the lightness value and chromaticity value of the second gray patch measured by the lightness and chromaticity measuring means, and the lightness value and chromaticity value of the second comparison black patch. When at least one of the colors is compared and if any of the differences does not fall within the allowable range, the density value of the flat mesh patch of each color is adjusted to be within the reference density range set for each color. A printing press control device comprising an ink key adjustment means.

Images