JPH02741Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a work instruction sheet for instructing the settings of separation conditions for a color separation machine in plate making for multicolor printing.

Conventionally, when specifying the separation conditions for a color separation machine,
An experienced person skilled in the relevant work measures and observes the color manuscript using a densitometer, magnifying device, etc., determines the separation conditions, and then communicates the results to the color separation machine operator verbally or by writing in a work instruction sheet. Alternatively, a simple document analyzer may be used to measure the color document, and the measured data may be directly output and communicated to the operator of the color separation machine.

However, in the former method, the subjectivity of the judge is greatly involved in determining the decomposition conditions, so there are problems with the stability and reliability of the instruction data, and in the latter method, the measurement data is It is not possible to clearly indicate the correspondence between the measurement data required for setting the separation conditions of the color separator and the measurement points on the document, and it is not possible to clearly indicate the contents of the instructions. I can't.

This invention was made in consideration of the above points,
A work in which the density accumulation curve of a color original to be color separated, the highlight set point density value of the original, the density value of the selected point of the original, and the pseudo halftone image of the original are displayed in an array on the same sheet of paper. It consists of instructions.

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

FIG. 1 shows the configuration of a document evaluation device for printing out work instructions according to the present invention, which is similar to that shown in Japanese Patent Application No. 55-92414.

In this apparatus, a color original 1 placed on a viewer (not shown) is imaged by a TV camera 2 and transmitted to a camera controller 3 as a video signal. The camera controller 3 converts the video signal from the TV camera into a digital signal represented by 8-bit density and outputs it to the frame memory 4. This causes frame memory 4 to contain 8
A video signal expressed in bit density is stored, and a natural image is displayed on the TV monitor 5.

The frame memory 4 includes an enhancement circuit 6 and
Combined with CPU7. The enhancement circuit 6 is
When counting the frequency of each density step for the purpose of density accumulation, it is necessary to set the density step in the frame memory 4, or to set a threshold value when outputting a binarized slice image on the CRT monitor 10. It is set on the frame memory 4.

Calculations for determining density accumulation and commands for forming slice images are executed via the CPU 7 in response to instructions from the console 8, and the resulting density accumulation curve data and binarized image data are It is stored in the memory 9 and displayed on the graphic memory CRT monitor 10.

In addition, density accumulation curve data and binary image data are transferred from the graphic memory 9 to the printer output memory 12 in response to a work instruction output command from the operation console 8, while the image data in the frame memory 4 is converted using the pseudo halftone display method. The generated pseudo image data is also temporarily stored in the printer output memory 12. and,
The memory contents of this printer output memory 12 are ROM
Together with the character data previously stored in 11, the information is printed out via printer 13 in the format of a printer output form.

FIG. 2 shows a work instruction sheet according to the present invention, that is, a printer output form for the apparatus shown in FIG. In this figure 2, area 1 is ROM11
(Fig. 1), area 2 shows the pseudo halftone display image, area 3 shows the density accumulation curve, and area 4 shows the highlight set point density and the selected density. In the table, an area 5 surrounded by a broken line indicates a handwritten instruction to clearly indicate the positional relationship between the measured density value of the area 4 and the image of the original.

Figure 3 shows a schematic configuration of a color separation machine in which setting work is performed based on the work instructions as shown in Figure 2.
0, a control box 200, and a recording box 300. The instruction contents shown in Table 4 of the work instruction sheet are set using the setting elements in the control box 200. As a result, the scanning box 100 and the coding box 300 are mechanically connected.
The scanning box 100 scans the document 102 with the light source 101 and sends the signal extracted by the photoelectric converter 103 to the control box 2.
00 to the electro-optical converter 301 of the coding box 300, and scans the surface of the film 302. At this time, a signal is generated in the control box 200 based on the set value according to the instruction contents of the work instruction sheet.

Figure 4 shows other examples of work instructions according to the present invention, including Table 1, Image 2, Graph 3, and Table 4.
Consisting of

Table 1 shows the output of the character data previously stored in the ROM, but the output content is not limited to the work item entry field, but also includes the color separation machine's separation condition value entry field. A form that can also be used for data storage and recording can be obtained. Image 2 is an image converted using the dither method as a pseudo halftone display method. In addition to the dither method, a Δ-Σ modulation method or a ΔΜ method with a small integration time constant may be used as a pseudo halftone display method. Graph 3 is an output of a concentration accumulation curve, but it can also be output in the form of a concentration histogram. Table 4 outputs the highlight set point density value and selected point density value.

It goes without saying that the arrangement of Table 1, Image 2, Graph 3, and Table 4 can be arbitrarily changed and is not limited to the illustrated example.

Figures 5a and 5b show the conventional method (a) for setting highlight set points in color separation.
This figure shows a comparison between the method using the work instructions according to the present invention (Figure b), and the conventional method uses 8
Only three steps are required using the work instructions according to the present invention.

As mentioned above, this invention is a work instruction manual that can write the data for setting color separation conditions for multicolor printing plate making in the next step, so it is possible to read the scan head high on the color document installed in the color separation machine. The work time required to set each density balance value of yellow, magenta, and cyan at the light set point can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the configuration of an apparatus for creating a work instruction sheet according to the present invention, FIG. 2 is a diagram showing an example of a work instruction sheet according to the present invention, and FIG.
The figure is a block diagram showing the schematic configuration of a color scanner that sets the contents of the work instruction sheet, Figure 4 is a diagram showing another example of the work instruction sheet according to the present invention, and Figures 5 a and b are highlight sets. A conventional method and a method using a work instruction sheet according to the present invention are shown for point setting work. 1... Original document, 101... Light source, 102... Original document, 103... Photoelectric converter, 301... Electro-optical converter, 302... Film.

Claims (1)

[Scope of utility model registration request] In the work instructions that instruct the separation condition values of the color separator, the density accumulation curve of the color original to be color separated, the highlight set point density value of the original, the density value of the selected point of the original, the density value of the original Work instructions for setting separation conditions for a color separator, characterized in that pseudo-halftone images are displayed on the same page, and the position of the selected point can be clearly indicated on the pseudo-halftone image. book.