JPS5891451A - Inspecting method for partially corrected positive film of color print - Google Patents

Abstract

PURPOSE:To confirm that partial corrections are made completely, by collating a partially corrected black-and-white positive film with printed matter which is printed by using a black-and white positive film to be corrected partially and then compared. CONSTITUTION:Printed matter 1 printed and comparison is placed on a light table 3, and light is projected thereupon from below. Color separation filters 5 are selected succeedingly, an image pickup device 4 is used to perform image pickup operation regarding four pictures of C, M, Y, and B, and respective picture signals are inputted to different memory areas of a picture memory 8. Then, a collated picture is read and then displayed on a color cathode-ray tube 10 as shown by a solid line A, for example, in green. The printed matter 11 on the light table 3 is removed, and a partially corrected black-and-white positive film 2 of a color plate to be collated is placed thereupon. Its picture is picked up without using any color separation filter 5 and displayed on the cathode-ray tube, for example, in pink, and only positions to be corrected are indicated in different color.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes a five-plate plate-making process for color printing, and converts the black-and-white positive film of each color plate that has been partially corrected into the printed matter of Kiri-sushi, or the black-and-white positive film of each color plate that has not been partially corrected. Concerns how to check whether partial corrections have been made completely by checking with the film.

When printing in color, first use a color scanner to separate the color document into the four primary colors of yellow, magenta, cyan, and black, and then screen out the shading of each image. Create a black and white film that shows the size of dots. Furthermore, a complete black-and-white positive film (abbreviated as black-and-white positive film in this specification) for each color version is created by engraving the letters, inlaying the design, or cutting out the image, and then this is used for plate making and proof printing. . Proof print-1
j If you look at the object and find any mistakes, etc. 12, and if you need to make some corrections, create a partially corrected black and white positive film again using the previous procedure. Before reprinting using this partially corrected black and white positive film, the partially corrected black and white positive film is combined with a proof print using the black and white positive film before the partially corrected to ensure that the one part correction has been completely made. There is a need to illuminate whether or not it is true.

Conventionally, this work was carried out by placing a proof print on a light table, laminating a partially corrected black and white positive film on top of it, and comparing it directly with the naked eye. However, as mentioned above, not only are there four versions of black-and-white positive film: yellow, red, indigo, and black, but also because each film is black and white, it is easy to make mistakes when checking, which is extremely This was nerve-wracking work and required a great deal of effort.

Further, in some cases, it may be necessary to compare the partially corrected black-and-white positive film with the monochrome positive film before the partial correction, but this comparison also has the same problems as above.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method that facilitates the above-mentioned work and allows detection of all the correct positions of the portion I'Jh of a re-produced black and white positive film.

In order to achieve the above object, the present invention includes an imaging device and a digital camera.
Using a spray device, compare the color-separated artist of the proof printed matter and the image of the partially corrected black and white positive film of the color plate, or the image of the black and white positive film before the partial correction. Color versions of black and white positive film images (tR'r, each with a different color and brought closer to each other for easy comparison.

Alternatively, the images may be displayed on both sides of a display device in a superimposed state, and both images may be compared.

Embodiments of the present invention will be described below with reference to the drawings.

The drawings show a schematic configuration of a device for implementing the present invention.

In the figure, 1 is a proof printed matter, 2 is a black and white positive film partially corrected after proofing, 6 is a light table with a built-in light source, and 4 is an imaging device equipped with a color separation filter 5. In principle, it is an ordinary electronic A tube type television camera may be used, but in order to accurately inspect the black and white positive film mentioned above, a C
A high-resolution camera with a two-dimensional scanning mechanism added to a CD linear image sensor (for example, Super Scanner PIC-2500 manufactured by Ikegami Tsushinki, scanning line density 10 lines/mm)
) etc. is practical. 6 is a camera control unit that drives the two-dimensional scanning mechanism, etc.; 7 is a display image color-based unit;
A movable display device consisting of the following parts: Reference numeral 8 denotes an image memory having a refresh-1 function, and a magnetic disk, core memory, IC memory, etc. can be used.

9 is a display control unit that performs screen synchronization control, memory recall L, change of recall position, etc., 10゛ is a color plow/tube that is a display unit, 11 is a light pen for moving images, and a joystick that has the same functions. , a digitizer, etc. may be used instead.

12 is a keyboard for specifying a display image. All of the above-mentioned parts are known, and the explanation of the configuration of each part will be omitted.

The procedure for comparing a proof printed product with a partially corrected black-and-white positive film using the above-mentioned device will be described. First, the proof printed product 1 is placed on the light table 5, and light is emitted from below. The color separation filters 5 are sequentially selected, and the imaging device 4 is used to take four images of the printing plate, red printing, indigo printing, and black printing (one image per surface), and each image signal is stored in the image memory 8.
input to the memories of A11 in the memory. Thereafter, the one-stroke 1' image (for example, a plate) to be compared is specified using the keyboard 12, and is called from the image memory 8 to the display control section 9.
As shown in real MA on color cathode ray tube 10.

For example, display it in green. Next, light table 3
The proof printed matter 1 placed on top is removed, and a partially corrected black-and-white positive film 2 of a color plate (for example, a plate) to be checked is placed on the light table 3. The image of the black-and-white positive film 2 is captured as it is by the camera 4 without using the color separation filter 5.
For example, the image is displayed in pink, as indicated by the dotted line B above o. The double-sided images A and B displayed on the same screen in this way are moved in the X and y directions using the light pen 11, for example, by moving the solid line image A to bring them close to a distance that makes matching easy, or to overlap them. Bd is displayed in both images to be compared in different colors as shown above, so for example, when viewing both images superimposed, the matching parts of both images will appear in the same color, and the different parts will appear in either one. Because it appears in color 11
Differences between the two pictures, that is, parts of the black and white positive film 20 that have been partially corrected, can be instantly detected.

Similarly, images of each of the red, indigo, and black versions can be recalled from the image memory 8 and displayed, and sequentially compared with the corresponding partially corrected black-and-white positive film images. When moving an image using the light pen 11, the memory whose recall position is desired to be changed can be specified by switching a switch on the display control section 9. It is included for each color of both images that you want to match. In the above embodiment, four color-separated images of a proof printed matter are input into the image/image memory continuously, but it is also possible to input each image one by one to the memory and compare it with the image on the black and white positive film. Often, this will result in a slight loss in efficiency, but it will use less memory. Also,
If the keyboard 12 has a built-in program memory, images can be sequentially recalled from the memory with a single button.

It is clear that the comparison between the partially corrected black-and-white positive film and the monochrome positive film before the partial correction can be carried out using the same procedure as above, except that the 19-color separation filter 5 is not used.

As explained above, according to the present invention, both images to be compared are color-coded on the cathode ray tube and displayed close to each other at a distance that facilitates matching, or are displayed overlapping each other. Easily compare the proof printed matter or the partially corrected black and white positive film of each color plate with the black and white positive film before correction.1. It is highly effective in shortening work time, reducing worker fatigue, and reducing losses caused by mistakes.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram of an apparatus for implementing the present invention. 1... Proof printed matter (or black and white positive film before partial correction) 2... Black and white positive film with partial correction 3... Light table 4... Imaging device 5... Color separation filter 6...Camera control unit 7...Display device 8...Image memory 9...Display control unit 10...Color cathode ray tube 11...Light pen 12...Keyboard for image specification Agent patent attorney Junnosuke Nakamura

Claims (2)

[Claims] (1) In color printing, when comparing printed matter that has been proof-printed using black-and-white positive film of each color version before partial correction and black-and-white positive film of each color version that has been partially corrected after proofreading, The color-separated image and the partially corrected black-and-white positive film image to be compared are converted into electrical signals by an imaging device and input into the image memory of the display device, and both images to be compared are converted into different colors. A method for inspecting a partially corrected positive film in color printing, characterized by displaying the images on the screen of a display device by bringing the images close to each other at a distance that facilitates comparison, or superimposing them on the screen of a display device, and comparing the two images. (2) In color printing, when comparing the black-and-white positive film of each color plate before partial correction with the black-and-white positive film of each color plate partially corrected after proofreading, one image of the black-and-white positive film before partial correction IE is used. 1. An image of a black and white positive film with a partially corrected color plate to be compared to ++ is converted into an electrical signal by an imaging device. Input the images into the Nice Play device's image memory, give each image a different color to the two images to be matched, move them closer together for easy matching, or display them on the screen of the Nice Play device. Part 1 in color printing, characterized by comparing images - Inspection method for positive film.