JPS6211855A - Preparation of color sample with color instruction for multi-color printing in photochemical process - Google Patents

Abstract

PURPOSE:To easily repair imperfection such as neglection of an instruction by inputting the information on the image on a cathode ray tube to a color printer and printing the same or photographing the same with a color photograph. CONSTITUTION:The black and white film A photographing a block copy by using a computer graphic and image processing machine is inputted via a computer graphic to the color cathode ray tube C to reproduce the same image as the image of the block copy on the tube C. The respective parts of the image on the tube C are colored as shown by the color instruction by the computer graphic and indices 4 indicating the colored names 3 and colored parts are displayed by utilizing the margin part of the image. The colored image expressed on the tube C is thus visually observed and the presence or absence of the imperfection such as the neglection of the instruction is detected.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is for producing a color separation film by masking work from an uncolored or simply colored original with a color instruction sheet attached. Concerning how to create coloring samples with color instructions used for coloring.

<Prior Art> Photolithography of printed matter consisting of colored characters or designs is usually done using an uncolored or lightly colored draft manuscript or a black and white film photographing the same draft manuscript, as shown in Figure 1 of the attached drawing. Overlay tracing paper B on A and use hues to instruct each part of the transparent pattern 1 to be colored.For example, red (M), indigo (C), yellow (Y), ink (Bl), or a mixed color. In this case, write color instructions such as 50% indigo and 40% yellow on tracing paper B, create a colored sample by hand based on these instructions, and use this colored sample as a reference for what is normally called mask work. Through this process, a color-coded film is created, and the colors created during the masking process are used to create a positive film from the film, which is then printed to create a printing plate.

<Problems to be Solved by the Invention> In the conventional method, it is difficult to determine whether the person is a mask worker because the color instructions written on the draft manuscript or the tracing paper superimposed on the black and white film vary depending on the instructions. or,
To prevent misunderstandings, omission of instructions, or false instructions, please print the colors of each part according to the color instructions (tI=-Create almost identical coloring samples). Visual inspection is required, and these preparatory tasks require skill and a lot of time and effort.If an irregularity is found in the color instructions, work may be interrupted while waiting for instructions. , there is a drawback that corrections based on additional instructions require a lot of time and effort.

<Means for Solving the Problems> The present invention uses an image processor and an image processor to reproduce images and color instructions on a color cathode ray tube in accordance with the color instructions. After observing the above image and checking and correcting any omissions, incorrect instructions, etc., output it to a color printer, etc., print 1~, and use it for mask work or plate inspection work. .

<Example> As shown in Fig. 1 of the attached drawings, one side of lacing paper B was pasted on the surface of a black and white film on which a blind color or simply colored draft manuscript was projected, and other appropriate coatings were applied. A color name 2 is displayed on each of the pattern parts 1 seen through the tracing paper B to form a color instruction sheet.

In this invention, a computer graphic and an image processor are used, and the information obtained by passing the black-and-white film A, which is a copy of the above-mentioned original, through the image processor is inputted to a color cathode ray tube C via a computer graphic. This allows the same cathode ray tube to reproduce the same image as the original.

Next, each part of the image on the cathode ray tube C is colored as shown in the color instructions using pico-tagraphics, and the colored color names 3 and indicators 4 indicating the colored parts are added to the margins of the image as shown in Figure 2. Display using .

Visually observe the colored image expressed on the cathode ray tube C as if it were a ``Stick'' and check for defects such as omitted instructions or incorrect instructions. If there are any instructions, we will partially correct the computer input, and at the same time modify the instructions for the cathode ray tube to create an image with colors close to the printed finish, and then store the manual input information to the cathode ray tube in the computer or external storage device. This information is output to a color printer to produce a pudding i~ which is colored the same as the image on the cathode ray tube C and has a color instruction sheet for instructing the coloring of each part, and this is used as an instruction sheet for mask work.

Note that the above-mentioned color print can also be replaced by a color photograph of a cathode ray tube image.

The mask work is based on the image of pudding 1~ and the color instruction sheet that instructs the coloring of each part, and by using known means such as masking or half-screening, we apply films in four different colors: red, indigo, yellow, and ink. make. In this case, for the edge, a mixed color of purple and brown, for example, for the green part, both the indigo and yellow colors are transferred to the film, and the mixing ratio and shading of each color are adjusted by halftone printing.

For the above-mentioned colors, the film is used in the same way as in the past, and the original printing plate is produced by inverting the culm to make a positive film and then burning the same film.

<Effects of the Invention> In this invention, a skilled person can manually draw a coloring instruction sample that is almost the same as the printed finish, which takes a lot of time and effort.
[Omitting the conventional method, we use an image processing machine and] computer graphics to express the coloring and color instructions on the color cathode ray tube, and eliminate any omissions, incorrect instructions, and other deficiencies. This can be quickly and reliably inspected visually from the image on the cathode ray tube, and defects can be partially repaired in the cylinder.The confirmation image is then printed on a color printer, making it possible for experts to Colored samples that used to take several hours to create can now be created in less than 30 minutes, greatly reducing the amount of work and time required to prepare for mask work, and greatly improving work efficiency and reducing costs. There is.

Also, the information of the final image expressed on the color cathode ray tube can be stored in a computer or external device! By doing so, it can be used for changing the coloring of printed matter with the same design, partially changing the design, enlarging or reducing the print size, etc.

[Brief explanation of the drawing]

FIG. 1 of the accompanying drawings is a front view, partially missing, of a color instruction sheet in photolithography, and FIG. 2 is a front view of a colored image and color instruction sheet expressed on a color cathode ray tube. A... Black and white film showing the original version B... Tracing paper

Claims (1)

[Claims] Using an image processing machine and computer graphics, we use an image processing machine and computer graphics to reproduce the same image as the original on a color cathode ray tube, and color the image on the cathode ray tube according to the color instructions. The colored part and color name are displayed on the cathode ray tube, and the colored image of the cathode ray tube is used to examine deficiencies such as omissions and incorrect instructions in the color instruction sheet. To provide a method for creating a colored sample with color instructions for multicolor printing in photoengraving, characterized by inputting instruction information into a color printer and printing it, or taking a color photograph.