JPH0777820B2 - Duplicate printing method for line drawing images - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplicate printing method used for duplicate printing of images such as copperplate prints.

[0002]

2. Description of the Related Art Recently, a technique for printing a reproduction of a painting or the like has been well developed, and gradations and touches have been reproduced well. When printing a picture, etc., by printing an original image on color film, create a color film original, scan this color film original with a scanner to create a color separation original for each color, and then make a plate from this color separation original. It is created and multi-color printed. According to this method, the gradation of the original image can be reproduced well together with the development of printing technology.

However, in a painting having a line drawing tone portion such as a copper engraving, in addition to the gradation, the raised line drawing tone portion characterizes the interest of the painting. It is not possible to reproduce the interest of the original picture by just reproducing it, and it is necessary to faithfully reproduce the line drawing tone part that is rising at the same time as reproducing the gradation. As a technique conventionally used to reproduce the raised line drawing tone part, while the ink for offset printing or the like is in an undried and sticky state, a heat-meltable powder is sprinkled onto the ink and adhered. A barco printing method is known in which heat treatment is performed to remove the unnecessary powder, and then the heat treatment is performed to form a bulge.

[0004]

However, in such a method, the ink swell portion is rounded due to surface tension,
It is too glossy to accurately represent the fine lines of a copper engraving. For this reason, it is desired to develop a technique capable of faithfully reproducing both the gradation part and the line drawing part of a painting having the gradation part and the line drawing part such as a copperplate print.

The present invention has been made in view of the circumstances as described above, and it is possible to easily and surely perform both the gradation part and the line drawing part of a painting having the gradation part and the line drawing part like copperplate engraving. The purpose is to sell a reproduction method of a line drawing image that can be reproduced faithfully by printing.

[0006]

To solve this problem, the method of reproducing a line drawing tone image according to the present invention prints an original image on a color film to create a color film original, and then the color film original is also printed. Using a Tozuki scanner, create a color separation original for each color and a skeleton original that takes out the line-tone part of the image, create an offset printing plate for each color using the color separation original, and use the skeleton original. Create a screen printing plate, offset printing the gradation image by the offset printing plate of each color, then use the screen printing plate on the printed gradation image to draw an image with an ultraviolet curable transparent or It is characterized by screen printing with light color ink.

[0007]

[Function] A color film original is created from the original image, and then a color separation original and a skeleton original in which the line drawing tone portion of the image is taken out from this color film original, and an offset printing plate of each color is created using the color separation original Then, create a screen printing plate using the skeleton original, offset print the gradation image with an offset printing plate of each color to reproduce the gradation of the original image, and then print the screen printing image on the printed gradation image. Screen-print the lines using the plate to reproduce the line drawing tone part. In this way, both the gradation portion and the line drawing tone portion are reproduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing embodiments.

In the line drawing tone image duplication printing method according to the present invention, first, the original image 1 is photographed with a color film to prepare a color film original 2 (FIG. 1A), (FIG. 1B).
As shown in FIG. 2, the original image 1 is a copper engraving and has gradation portions 3 and 4 composed of multi-gradation colors and raised image portions 5 and 6.

Next, the color film original 2 is applied to the scanner 7 (FIG. 1C) to prepare color separation originals 8 of B, Y, M, and C colors (FIG. 1D), and the line drawing of the image is further performed. A skeleton manuscript 12 in which the key parts 5 and 6 are taken out is created (FIG. 1E).

Next, an offset printing plate 13 of each color is created using the created color separation original (FIG. 1 (f)), and a screen printing plate 14 is created using the created skeleton original 12.
Is created (FIG. 1 (g)).

Next, the offset printing plate 13 for each color created
Then, offset printing is performed on the gradation image printing paper 15 (FIG. 1 (h)). In this state, as shown in FIG. 3, the offset ink 16 representing the gradation portions 3, 4 of the original image is placed on the printing paper 15.

Next, an image line is screen-printed on the printed gradation image using the screen printing plate 14 (see FIG. 1).
(I)). In this state, as shown in FIG.
The screen ink 17 that expresses the image line parts 5 and 6 of the original image 1 is placed on the offset ink 16 that expresses the gradation parts 3 and 4 of the original image.

Thus, the duplicate image 18 is completed (see FIG. 1).
(J)).

(Experimental example) A line drawing original in the Goya copper engraving book was reproduced as a copy of the book entitled "Kimagure".
A transparent positive film (generally colored
Photographed on a positive film and used as a secondary original (in this case, the original image is the primary original).

The secondary original is divided into four colors by using an electronic color separation halftone generator to prepare an offset original plate. The halftone dot number line at this time was 350 lines.

Using this offset original plate, a four-color offset printing was carried out on a printing paper diamond peek (135 format, 46 Kg, Mitsubishi Paper Mills).

Next, a screen printing method was used to form a transparent ridge on the line drawing portion of the four-color offset printing surface. There are three possible ways to make this line drawing. Since (i) is based on the synchronization with the original used for 4-color offset printing, the line drawing tone part is taken out by using the electronic color separation halftone generator as in the case of using the offset original for screen. Make base paper. In (ii), a line drawing original plate is made from a 4-color offset original plate by a photographic technique. That (iii)
Produces a line drawing plate directly from a four-color offset print using a camera work in order to sufficiently match the registration of screen printing and offset printing. Here, (i) is used to make a line drawing original plate. A screen printing line drawing plate was produced using this line drawing original plate. The screen mesh was 200 mesh (Tetoron line), and the membrane pressure was 70 micron. Next, the line drawing part of the four-color offset printing surface was synchronized with the screen printing line drawing plate and transparent ink (manufactured by Seiko Advance Co., Manitcoat UV-8415-3 and gloss coating UV-84) was used.
A mixture ratio of 2: 8) was printed at 30 G, and then UV irradiation was applied to cure the mixture to form a protrusion.

According to this method, it is possible to reproduce the climax even in the fine portion of the line drawing tone of the original image in which the ridge of the climax is not distorted, and the texture of the copperplate print can be sufficiently expressed.

[0020]

According to the method for reproducing a line-drawing-like image according to the present invention, the portion of the image line is formed by screen printing and does not dissolve the coloring agent as in the conventional case. It is possible to accurately express the fine lines of the copperplate engraving, such as the raised portion being rounded by surface tension or being too glossy.

[Brief description of drawings]

FIG. 1 is a process explanatory view of a line drawing tone image duplication printing method according to the present invention.

FIG. 2 is an explanatory plan view of an original image.

FIG. 3 is a cross-sectional explanatory view showing an intermediate product of a duplicate image.

FIG. 4 is an explanatory sectional view showing a duplicate image.

[Explanation of symbols]

 1 original image 2 color film original 3 gradation part 4 gradation part 5 drawing part 6 drawing part 7 scanner 11 color separation original 12 skeleton original 13 offset printing plate 14 offset printing plate 15 printing paper 16 offset ink 17 screen ink 18 reproduction

Claims (2)

[Claims] 1. A skeleton in which an original image is photographed with a color film to create a color film original, and then a color separation original of each color and a line drawing tone portion of the image are taken out using a scanner based on the color film original. An original is created, an offset printing plate of each color is created using the color separation original, a screen printing plate is created using the skeleton original, and a gradation image is offset printed by the offset printing plate of each color. A method of duplicate printing of a line drawing tone image, characterized in that an image line is screen-printed on the gradation image printed on the screen by using the screen printing plate. 2. The duplicate printing method for a line drawing tone image according to claim 1, wherein the screen printing is performed with a transparent or light color ultraviolet curable ink.