Overprinting base point calculation method based on multiple key domain points

Abstract

A calculation method of an overprinting base point based on a plurality of key domain points comprises the following steps: when a color pattern is printed, using the key domain points as the overprinting base point, detecting the overprinting deviation of two sides of a printing layout through a double-color mark probe, calculating an overprinting adjustment value by using the overprinting base point as a target point, and for a color image-text unit with a plurality of key domain points, calculating the overprinting adjustment value; and calculating and determining a printing base point by adopting a principle of preferentially approaching an important key domain point and considering a secondary key domain point. The overprinting base points based on the multiple key domain points are effectively determined, and the overprinting precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of overprinting technology for printing presses, and in particular to a calculation method for overprinting base points based on multiple key domain points. Background Art

[0002] A color pattern has multiple relatively independent graphic elements, among which there are graphic elements that can best express the design theme, which are called key areas. The midpoint coordinates of the key areas are called key domain points. Since a color pattern is formed by overprinting multiple colors, both pattern designers and users hope that the overprinting accuracy of the key areas is the highest. Therefore, an overprinting method has emerged that uses key domain points as overprinting base points and detects the overprinting deviation on both sides of the printing plate surface through a double-color mark probe, and calculates the overprinting adjustment value with the overprinting base point as the target point. However, when there are more than one key domain points in some color graphic units or layout plates, it is necessary to effectively determine the calculation method for overprinting base points based on multiple key domain points. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a calculation method for overprinting base points based on multiple key domain points, effectively determine the overprinting base points based on multiple key domain points, and improve the overprinting accuracy.

[0004] To solve the above technical problem, the technical solution of the present invention is: a calculation method for overprinting base points based on multiple key domain points. When printing a color pattern, use key domain points as overprinting base points, and detect the overprinting deviation on both sides of the printing plate surface through a double-color mark probe, and calculate the overprinting adjustment value with the overprinting base point as the target point. For color graphic units with multiple key domain points, adopt the principle of giving priority to approaching important key domain points and taking into account secondary key domain points to calculate and determine their printing base points. The method for calculating the position value of the overprinting base point includes the following steps: 1) Set 1-3 key domain points for the color graphic unit or layout plate. When there are two key domain points, the two key domain points can be set to be equally important or one is an important key domain point and the other is a secondary key domain point; when there are three key domain points, the three key domain points can be set to be equally important or one is an important key domain point and the other two are secondary key domain points; 2) When there are two key domain points in the color graphic unit or layout plate, when the two key area points are equally important, the midpoint of the line connecting the two key domain points is used as the overprinting base point of the color graphic unit; when the two key domain points are not equally important, the first preferred point of the line connecting the two key domain points is used as the overprinting base point of the color graphic unit, and the ratio of the distance from the first preferred point to the important key domain point to the distance from the first preferred point to the secondary key domain point is 0.618; 3) When there are three key domain points in a color graphic unit or a composed layout, when the three key domain points are equally important, the orthocenter of the triangle formed by these three key domain points is used as the overprint base point; when the three key domain points are not equally important, a circle is drawn with the orthocenter of the triangle formed by these three key domain points as the center and a radius of 0.382 * the distance from the orthocenter. The intersection point of this circle and the line connecting the orthocenter of the triangle and the important key domain point is the second preferred point, and the second preferred point is used as the overprint base point of the color single graphic element.

[0005] The beneficial effects brought by the present invention compared with the prior art are as follows: When there are multiple key areas in a color graphic unit or a composed layout, according to the importance degree of the key areas, the equidistant center point or the preferred point of multiple key areas in the color graphic unit and the printing layout is calculated as the overprint base point by the principle of giving priority to approaching the important key domain points and taking into account the secondary key domain points. Thus, when calculating the operation adjustment amount, the position of the overprint base point of the printing layout is associated with the overprint deviation of the detected overprint color mark, and overprint analysis and calculation are carried out around the overprint base point to calculate the input values of the longitudinal and transverse overprint adjustment amounts based on the overprint base point, ensuring that the overprint accuracy of the key areas reaches the highest. Brief Description of the Drawings

[0006] Figure 1 It is a schematic diagram of the overprint base point of three key domain points of the first form with different importance degrees.

[0007] Figure 2 It is a schematic diagram of the overprint base point of two key domain points with equal importance.

[0008] Figure 3 It is a schematic diagram of the overprint base point of two key domain points with different importance degrees.

[0009] Figure 4 It is a schematic diagram of the overprint base point of three key domain points with equal importance.

[0010] Figure 5 It is a schematic diagram of the overprint base point of three key domain points of the second style with different importance degrees.

[0011] Figure 6 It is a schematic diagram of the overprint base point of three key domain points of the third form with different importance degrees. Detailed Embodiment

[0012] The present invention will be further described below in conjunction with the accompanying drawings of the specification.

[0013] A method for calculating the overprint base point based on multiple key domain points. When printing a color pattern, the key domain points are used as the overprint base points, and the overprint deviation on both sides of the printing layout is detected by a two-color mark probe. The overprint adjustment value is calculated with the overprint base point as the target point. For a color graphic unit with multiple key domain points, the principle of giving priority to approaching the important key domain points and taking into account the secondary key domain points is adopted to calculate and determine its printing base point. The method for calculating the position value of the overprint base point includes the following steps: 1) Set 1 - 3 key domain points for the color graphic unit or the imposition layout. When there are two key domain points, the two key domain points can be set to be equally important or one is the important key domain point and the other is the secondary key domain point; when there are three key domain points, the three key domain points can be set to be equally important or one is the important key domain point and the other two are the secondary key domain points; 2) When there are two key domain points in the color graphic unit or the imposition layout, when the two key area points are equally important, the midpoint of the line connecting the two key domain points is used as the overprint base point of the color graphic unit; when the two key domain points are not equally important, the first preferred point of the line connecting the two key domain points is used as the overprint base point of the color graphic unit, and the ratio of the distance from the first preferred point to the important key domain point to the distance to the secondary key domain point is 0.618; 3) When there are three key domain points in the color graphic unit or the imposition layout, when the three key domain points are equally important, the orthocenter of the triangle formed by the three key domain points is used as the overprint base point; when the three key domain points are not equally important, a circle with a radius of 0.382 * the orthocenter distance is drawn with the orthocenter of the triangle formed by the three key domain points as the center. The intersection point of the circle and the line connecting the orthocenter of the triangle and the important key domain point is the second preferred point, and the second preferred point is used as the overprint base point of the color graphic unit.

[0014] As Figure 2 shown, for the calculation of the overprint base point of two equally important key domain points, A1 and A2 are two equally important key domain points in the color graphic unit or the imposition layout, and point O' is the midpoint of the line connecting A1 and A2. The overprint base point O coincides with O'.

[0015] As Figure 3 shown, for the calculation of the overprint base point of two key domain points with different importance, A1 and A2 are two key domain points with different importance in the color graphic unit or the imposition layout, A1 is the important key domain point, A2 is the secondary key domain point, and the ratio of the distance from the overprint base point O to A1 and A2 is 0.618.

[0016] As Figure 4As shown in the figure, the calculation of the overprint base points for three equally important key domain points. Points A1, A2, and A3 are three equally important key domain points within a color graphic unit or a layout. Point O' is the orthocenter of the triangle formed by A1, A2, and A3, and the overprint base point O coincides with O'.

[0017] As Figure 1 shown in the figure, the calculation of the overprint base points for three key domain points of different importance. A1 is an important key domain point, and A2 and A3 are secondary key domain points. Point O' is the orthocenter of the acute triangle formed by A1, A2, and A3. The distance between O' and point A1 is the orthocenter distance. The overprint base point O is the second preferred point on the line connecting O' and A1. The ratio of the distance between point O and A1 to the orthocenter distance is 0.618.

[0018] As Figure 5 shown in the figure, a schematic diagram of the calculation of the overprint base points for three key domain points of different importance. In the figure, A1 is an important key domain point, and A2 and A3 are secondary key domain points. Point O' is the orthocenter of the obtuse triangle formed by A1, A2, and A3. Point A1 is the obtuse vertex of the obtuse triangle. The distance between O' and point A1 is the orthocenter distance. The overprint base point O is the second preferred point on the line connecting O' and A1. The ratio of the distance between point O and A1 to the orthocenter distance is 0.618; As Figure 6 shown in the figure, the calculation of the overprint base points for three key domain points of different importance. A1 is an important key domain point, and A2 and A3 are secondary key domain points. Point O' is the orthocenter of the obtuse triangle formed by A1, A2, and A3. Point A1 is the acute vertex of the obtuse triangle. The distance between O' and point A1 is the orthocenter distance. The overprint base point O is the second preferred point on the line connecting O' and A1. The ratio of the distance between point O and A1 to the orthocenter distance is 0.618.

[0019] Through the above calculation method, when there are two or more key domain points and the key domain points are equally important, the distances from the overprint base point to the equally important key domain points are equal; when there are key domain points of different importance, the calculated overprint base point satisfies the principle of giving priority to approaching the important key domain points and taking into account the secondary key domain points, thus realizing an overprint method that ensures the overprint accuracy of multiple key domain points.

Claims

1. A method for calculating an overprint base point based on multiple key domain points. When printing a color pattern, the key domain points are used as overprint base points, and the overprint deviation on both sides of the printing plate is detected by a double color mark probe. The overprint adjustment value is calculated with the overprint base point as the target point, which is characterized by: For a color graphic unit with multiple key domain points, the printing base point is calculated and determined based on the principle of giving priority to the important key domain points and taking into account the secondary key domain points. The method for calculating the overprint base point position value includes the following steps: 1) Set 1-3 key domain points for color graphic units or imposition layouts. When there are two key domain points, they can be set to be equally important or one can be an important key domain point and the other can be a secondary key domain point; when there are three key domain points, they can be set to be equally important or one can be an important key domain point and the other two can be secondary key domain points; 2) When there are two key domain points in a color graphic unit or a layout, if the two key domain points are equally important, the midpoint of the line connecting the two key domain points is used as the overprint base point of the color graphic unit; if the two key domain points are unequally important, the first preferred point of the line connecting the two key domain points is used as the overprint base point of the color graphic unit, and the ratio of the distance from the first preferred point to the important key domain point to the distance from the first preferred point to the secondary key domain point is 0.618; 3) When there are three key domain points in a color graphic unit or a typesetting layout, and when the three key domain points are equally important, the orthocenter of the triangle formed by the three key domain points is used as the overprint base point; when the three key domain points are unequally important, a circle with a radius of 0.382*orthocenter distance is made with the orthocenter of the triangle formed by the three key domain points as the center, and the intersection of the circle, the orthocenter of the triangle and the line connecting the important key domain points is the second preferred point, and the second preferred point is used as the overprint base point of the color single graphic unit.

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