JP2670093B2 - Plate-making material output device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to an improvement of a plate-making material output device that reads an image of a color transparent original document on which characters, figures, etc. are drawn, and adds a process such as layout change to the read image to output a color separation plate.

[Prior art]

In recent years, with the development of computers, color separation plate output based on an image read from a color transparent original is performed using the computer. Devices of this type generally include
Layout scan is used. This layout scanner refers to a system in which the scanner is connected to a computer, and performs predetermined processing using a computer on an image of a color transparent original input from the scanner, or collects printed images without using an intermediate material. The photolithography process for producing a color plate is performed by a computer. With this layout scanner, for example, as shown in FIG. 4, from a color transparent original document in which figures of shapes 12, 14, and 16 are arranged in one layout 10,
Consider a case where each color separation plate of yellow (Y), magenta (M), cyan (C), and black (Bk) is output. Normally, in Leytoskiana, Y, M, C, Bk
Four suitable halftone angles are preset for the plate.
In this case, the mesh angle of each color separation plate is 0 ° C for the Y plate and 15 for the M plate.
゜, C version is 45 °, Bk version is 75 °. Regarding the dot area ratio, in Figure 12, M is 80%, C is 50%, and Figure 14
, Y is 50%, C is 80%, and Bk is 100 in figure 16.
%. When the color separation plate is output according to the set mesh angle, it becomes as shown in FIG.
Regarding 14A, since it has a substantially square shape as shown in FIG. 5, the angle of the shape with respect to the layout was close to the net angle of 45 °, and the so-called jaggedness of each side was significantly increased. . Therefore, for this C version, the overall mesh angle is 45
After resetting from 60 ° to 60 °, the shape of C plate was re-outputted as shown in FIG. As for the C plate, as shown in FIG. 7, the shape laid out as the C plate is re-outputted as the M plate at a mesh angle of 15 °, and as for the C plate graphic 14A shown in FIG. 7
The setting of the mesh angle was changed by instructing the subsequent process to use the graphic 14B in the figure. However, the conventional halftone angle setting / changing performed as described above has the following problems. (1) Since an appropriate halftone angle is set in advance for each color separation plate, it is necessary for the operator to constantly monitor the unevenness of each figure on the color separation plate. The angle must be reset and the work efficiency becomes low. (2) If only changing the mesh angle setting is inconvenient,
It is necessary to perform re-outputting as a separate version, which consumes output time and materials, and the instructions to the subsequent steps are complicated, and problems such as mistakes in work are likely to occur.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and enables an optimum setting of each network for each character or figure in one layout by judging conditions of a computer or the like. As a result, a plate-making material output device capable of obtaining desired color separation plates at a time without re-outputting the color separation plates can be obtained because the operator's constant monitoring is not required. The challenge is to provide.

[Means for achieving the object]

The present invention relates to a plate-making material output device configured to read an image of a color transparent original document on which characters / figures are drawn, and to output a color separation plate by applying processing such as layout change to the read image. The object is achieved by providing means for setting the halftone angle of the plate for each character / figure according to the conditions required for printing the character / figure. The condition required for printing the character / figure can be at least one of the number of colors used, the halftone dot area ratio, and the layout shape.

Actions and effects of the present invention

In the present invention, in the plate-making material output device, when the color separation plate is output from the color transmission original, the halftone angle of the color separation plate is set to the character / character for each character / figure in the color transmission original.
It can be set according to the conditions required for printing graphics. Therefore, without the need for constant operator monitoring,
Since the optimal halftone angle can be set for each character / graphic, work efficiency can be improved. In addition, since it is not necessary to change only the halftone angle setting as in the prior art, there is no need to re-output the color separation plate, and the desired color separation plate can be
The excellent effect of being able to output in one time is obtained. In the present invention, the condition required for printing characters / graphics can be at least one of the number of colors used, the dot area ratio, and the layout shape. As a result, it is possible to select the optimum condition according to the required output of the plate-making material, and it is possible to further improve the work efficiency.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, a layout scanner having an overall structure as shown in FIG. 2 is used to output a color separation plate from a color transparent original according to the procedure shown in FIG. The layout scanner device shown in FIG. 2 includes a scanner 20 having an input drum 21 and an output drum 22, a linear encoder 23 and a rotary encoder 24 for detecting the positions Px and Py of the scanned document. An interface (I / F) 25 for inputting the detected position Px and Py information to the input / output computer 27, and only a predetermined insertion area from an image input from the interface 25 are connected. An input / output computer 27 for storing in a storage device 34 via a switching device 33, a keyboard 28 for inputting an instruction from an operator to the input / output computer 27, and a connection disconnection described later from the storage device 34. A layout for calling up one screen of image data via the device 35 and performing layout processing based on various layout information stored in the floppy desk 2 Computer 29
A cathode ray tube (CRT) display 30 for monitoring a state in which layout processing is performed by the layout computer 29; and a keyboard 31 for an operator to operate the layout computer 29 while looking at the display 30. Also, a mouse 32 and a connection switching device 33 for controlling the input / output of memory to / from the memory device 34 are provided. The figures read by the scanner 20 and laid out by the layout computer 29 are the same as those shown in FIG. Now, a procedure for outputting the color separation plates of the figures 12, 14, and 16 in the layout shown in FIG. 4 will be described based on the flow shown in FIG. That is, first, in step S1, a standard for determining the condition for the relationship between the number of colors used when printing the figure and the halftone angle is defined. This is to provide the layout computer 29 with data to be used as a criterion for condition determination. For example, if the number of colors of the figure is 1, the halftone angle is 45 °, and if the number of colors is 2, the halftone angle is 45 °. If the number of colors is 75, the halftone angles are 45 °, 75 ° and 15 °, and if the number of colors is 4, the halftone angles are 45 °, 75 °, 15 ° and 0 °. Then, in step S2, the dot area ratio (dot%)
The condition judgment criteria for the relationship between and the mesh angle are defined.
This is also done by giving data to the computer 29 as in step S1, and for example, the halftone angle of the one having the larger halftone dot area ratio among the separated colors of the same figure is 45 ° and the halftone dot area ratio is 100. If it is%, the halftone angle is 0 °. When the number of colors is two, the Y plate has a halftone dot angle of 75 ° even when the halftone dot area ratio is arbitrary, and when the number of colors is three, the Y plate has a halftone dot angle of 15 ° even when the halftone dot area ratio is arbitrary. When the number of colors is 4, the halftone dot angle of the Y plate is 0 ° even if the halftone dot area ratio is arbitrary. Then, in step S3, the condition determination criterion for the relationship between the layout shape and the halftone angle is defined. This is also done by giving data to the computer 29 similarly to step S1, and if the angle of the shape portion with respect to the layout is close to the mesh angle, 45 ° is added to the mesh angle. To do. Next, in step S4, for each character / graphic,
The halftone angle is set according to the condition criteria defined in steps S1 to S3. As for the figure 12 in Fig. 4, since the number of colors used is 2, the net angle is first 45 ° and 75 according to the judgment standard of step S1.
゜ is selected. And, the net angle area ratio is 80% in M version, C
In the case of 50% for the plate, the screen angle is ultimately selected to be 45 ° for the M plate (indicated by reference numeral 12M in FIG. 3) and to 75 ° for the C plate (FIG. 3). It is indicated by reference numeral 12C). Further, since the number of colors used for the figure 14 is 2, the mesh angles of 45 ° and 75 ° are first selected according to the judgment standard of step S1. And the halftone dot area ratio is 50% for Y version and 80 for C version.
%, So the Y version is 75 ° from the judgment criteria of step S2,
The C plate has a net angle of 45 °. In this case, since the angle of the shape with respect to the layout of the C plate is close to 45 °, 45 ° is added to the mesh angle according to the criterion of step S3 (45 ° + 45 ° = 90).
゜; 0 ゜). As a result, a net angle of 75 ° is selected for the Y plate (shown by 14Y in FIG. 3) and 0 ° for the C plate (3rd).
(Indicated by 14C in the figure). Further, as for the figure 16, since the number of colors to be used is 1, 45 ° is first selected from the criterion of step S1, and the halftone dot area ratio is 100% based on the criterion of step S2. An angle of 0 ° is selected (see 16Bk in Fig. 3).
Will be shown). Next, in step S5, the halftone angle is set to the angle selected in the previous step S4, and each color separation plate is output as shown in FIG. That is, as shown in FIG. 3, each color separation plate is output at once without requiring re-output. In this case, only the figure 14 (reference numeral 14Y) has a screen angle of 75 ° for the Y version, the screen angle is 45 ° only for the figure 12 (reference number 12M) for the M version, and the figures 12 and 14 for the C version.
, The halftone angle is 75 ° for the graphic 12 (reference numeral 12C) and 0 ° for the graphic 14 (reference numeral 14C). Furthermore, B
For k version, only the figure 16 (reference code 16Bk) has a halftone angle of 0 °. Each criterion shown in the above embodiment is an example of the number of colors to be used, the halftone dot area ratio, and each condition criterion of the layout shape. it can. For example, if the number of colors is 1, it may be changed to 30 °, and the condition that the smaller halftone dot area ratio is 0 ° may be added. Alternatively, the desired angle among the number of colors, the halftone dot area ratio, and the layout shape may be deleted to set the halftone angle. By doing so, the number of calculation programs of the layout computer 29 is reduced, and rapid color separation output can be performed.

[Brief description of the drawings]

FIG. 1 is a flow chart showing an example of setting a mesh angle judgment standard and a mesh angle output based on the standard according to the embodiment of the present invention, and FIG. 2 is a partial view showing an entire configuration of a layout scanner according to the embodiment. FIG. 3 is a block diagram including a perspective view, FIG. 3 is a plan view showing an example of the color separation plate output in the above-mentioned embodiment, and FIG. 4 is a plan view showing an example of a color transparent original on which the color separation plate is produced. FIG. 5 is a plan view showing an example when the transparent original is color-separated by a conventional technique, FIG. 6 is a plan view showing another color-separated plate output example, and FIG. 7 is another. 3 is a plan view showing an output example of FIG. 10 …… Layout screen, 12, 14, 16 …… Graphic, 20 …… Scanana, 29 …… Layout computer, 30 …… Cathode ray tube (CRT), 34… Storage device.

Claims (2)

(57) [Claims] 1. A plate-making material output device adapted to read an image of a color transparent original document on which characters / figures are drawn, and to output a color separation plate by applying processing such as layout change to the read image. The halftone angle of the color plate,
A plate-making material output device comprising means for setting according to a condition required for printing a figure. 2. The plate making method according to claim 1, wherein the condition required for printing the character / graphic is at least one of the number of colors to be used, a halftone dot area ratio, and a layout shape. Material output device.