JPH0675184B2 - Character figure processing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a character / graphics processing method for preventing the quality of a character from being impaired even when a character / graphics or the like is subjected to halftone dot separation and color printing is performed. It is a thing.

[Prior Art] When a character or a graphic is printed in a designated color, an ink is mixed so that the color is obtained, and the ink is solidly printed. By doing this, it is possible to print high-quality character graphics in the designated color. However, in order to deal with various colors, it is necessary to mix inks each time, which is very complicated and expensive. Therefore, normally, as with printing of photographs such as general landscapes, three-color or four-color halftone dot separation is performed on characters, and C (cyan), Y (yellow), M (magenta), and K (black) inks are printed. Printing was performed using ink to express the specified color.

[Problems to be Solved by the Invention] However, since color printing by halftone dot separation expresses colors by the size of halftone dots of each color plate, if this is applied to a character graphic, the outline of the character graphic is discontinuous. Therefore, the sharpness of the contour portion is lost and the quality is deteriorated. In particular, there is no problem as long as it is a character graphic that is sufficiently large with respect to the size of the halftone dot, but in the case of a small character graphic whose size of the halftone dot cannot be ignored, as shown in the example of FIG. It can be seen that the contour portion becomes discontinuous and the quality is very poor.

[Means for Solving the Problem] The present invention has been made from the above points, and is capable of printing a high-quality character graphic even when performing color printing by separating a character graphic into halftone dots. It is an object of the present invention to provide a method, which is characterized in that in a character and figure processing method for creating data for creating each color plate for color printing by decomposing a character and figure, In the halftone dot area ratio of each color plate obtained based on the information,
The purpose is to add the outline of a character graphic to the color plate with the maximum area ratio.

[Operation] The present invention creates the data of each color plate for printing a high-quality character graphic by giving the outline of the character graphic to any one of the color plates subjected to the dot separation.

[Examples] Examples of the present invention will be described below. In the following description, the character is explained among the character figures, but the same applies to the figure.

FIG. 1 is a flow chart showing a processing procedure of an embodiment of a character / graphics processing method of the present invention. FIG. 3 is a block diagram of a character / graphics processing apparatus suitable for implementing the present invention. Each part of FIG. 3 is as follows.

1; Halftone dot area ratio calculation unit. The halftone dot area ratio of each of the C, Y, and M color plates for expressing the color by printing the designated character color is calculated.

2; Character pattern generator. A character pattern is generated based on the sent character code, position, character size, and other character information.

3; Halftone dot generation section. Among the halftone dot area ratios calculated by the halftone dot area ratio calculation unit 1, the halftone dots of the designated color plate are generated in the character pattern generation unit 2 and generated in the character pattern.

4; contour generation section. Generates character outlines on the specified color plate if necessary.

5; Bitmap memory. The developed halftone dots and character outlines are bit-developed for each of the C, Y, and M color plates.

First, the halftone dot area ratio calculation unit 1 calculates the halftone dot area ratio of each color plate based on the specified character color information (S in FIG. 1).
1). Information on the calculated dot area ratio is sent to the dot generator 3 and the contour generator 4.

Next, the character pattern generator 2 generates a character pattern based on the sent character information such as the character code, position and character size (S2). The generated character pattern is sent to the halftone dot generating section 3 and the contour generating section 4.

Next, in the halftone dot generating section 3, the halftone dot of the designated color plate is converted into a character pattern from the halftone dot area ratio and the character pattern information sent from the halftone dot area ratio calculating section 1 and the character pattern generating section 2. Occurs inside (S3).

Next, when the halftone dot area ratio of the currently specified color plate is the maximum compared with the halftone dot area ratios of other color plates (S4), the contour generating unit 4
To generate the outline of the character (S5). The contour generated at this time may have a thickness corresponding to the dot area ratio, for example.

In this way, the halftone dots generated by the halftone dot generating section 3 and the contour of the character generated by the contour generating section 4 are developed in the bit map memory 5 when the designated color plate has the maximum halftone dot area ratio ( S6).

The above processing is performed for each color plate (S7).

When the printing plate is created and printed according to the data of each color plate developed in the bitmap memory 5 by performing the above-described processing, as shown in FIG. 4, the ink of the color having the maximum halftone dot area ratio is obtained. Since the contour 6 of the character is printed by, the discontinuous portion of the contour of the character is eliminated, and the quality is greatly improved.

Next, another embodiment of the present invention will be described.

FIG. 5 is a flow chart of another embodiment of the present invention. FIG. 6 is a block diagram of a character / graphics processing apparatus suitable for implementing this embodiment. In FIG. 6, the same parts as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

7: Halftone dot area ratio calculation unit. The halftone dot area ratio of each of the C, Y and M color plates for printing the specified background color and expressing the color is calculated.

8; comparator. Compares the halftone dot area ratio of the character color and the halftone dot area ratio of the background color of the specified color plate.

Next, an embodiment of the present invention will be described with reference to FIGS.

First, the halftone dot area ratio calculation unit 1 calculates the halftone dot area ratio of each color plate based on the specified character color information (S1). Information on the calculated dot area ratio is sent to the dot generator 3 and the comparator 8.

Next, the halftone dot area ratio calculation unit 7 calculates the halftone dot area ratio of each color plate based on the specified background color information (S2). Information on the calculated dot area ratio is sent to the comparator 8.

Next, the character pattern generator 2 generates a character pattern based on the sent character information such as the character code, position, character size, etc. (S3). The generated character pattern is sent to the halftone dot generating section 3 and the contour generating section 4.

Next, in the halftone dot generating section 3, the halftone dot of the designated color plate is converted into a character pattern from the halftone dot area ratio and the character pattern information sent from the halftone dot area ratio calculating section 1 and the character pattern generating section 2. Occurs inside (S4).

Next, the halftone dot area ratio of the specified color plate is the maximum (S5) compared with the halftone dot area ratio of other color plates (including the character color and background color), and When the halftone dot area ratio of the background color is larger than the halftone dot area ratio of the character color (S6), the contour generating unit 4 generates a contour outside the character (S7). On the other hand, the halftone dot area ratio of the specified color plate is the maximum (S5) compared with the halftone dot area ratio of other color plates (including the character color and the background color), and the background of that color plate When the halftone dot area ratio of the color is smaller than the halftone dot area ratio of the character color (S6), the contour generating unit 4 generates a contour inside the character (S8). The contour generated at this time may have a thickness corresponding to the halftone dot area ratio as in the previous embodiment.

In this way, the halftone dots generated by the halftone dot generator 3 and the outline of the character generated by the outline generator 4 when the outline of the character is generated are developed in the bit mop memory 5 (S9).

The above processing is performed for each color plate (S10).

As described above, it is possible to generate the outline of a character in consideration of the background color and the character color inside or outside the character.

Although the above embodiment is an example of printing with three colors of C, Y and M as a color plate, the present invention may be applied to printing with four colors including K (black) in addition. Of course.

[Effect] As described in detail above, according to the present invention, the data of each color plate is created by giving the outline of the character graphic to the one having the largest area ratio among the color plates subjected to the dot separation. ,
When a printing plate is created based on the data and printed, the outline of the character graphic is printed in addition to the halftone dots, so that a high quality character graphic can be printed. In addition, since the contour is attached to only one color, which is the maximum halftone dot area ratio, the internal color of the character graphic and the contour color do not extremely differ from each other when printed, and a sense of discomfort due to the contour printing is given. High quality printing can be done without giving. And so on.

[Brief description of drawings]

1 and 5 are flow charts of an embodiment of the present invention, FIG. 2 is a view showing problems in the conventional art, and FIGS. 3 and 6 are suitable character / graphic processing apparatuses for carrying out this embodiment. 4 is a block diagram of FIG. 4, and FIG. 4 is a diagram showing an example in which contours are added to characters according to the present invention. 1 ... halftone dot area ratio calculation unit 2 ... character pattern generation unit 3 ... halftone dot generation unit 4 ... contour generation unit 5 ... bitmap memory 7 ... halftone dot area ratio calculation unit 8 ... comparator

Claims (5)

[Claims] 1. A character and figure processing method for creating data for creating each color plate for color printing by decomposing a character and figure, and a halftone dot of each color plate obtained based on information on the character and figure color. A character / graphics processing method characterized in that a contour of a character / graphic is provided to a color plate having a maximum area ratio among the area ratios. 2. A character / graphics processing method for creating data for creating each color plate for color printing by decomposing a character / graphics with halftone dots, wherein the outline of the character / graphics is given to the designated color plate. Character and graphic processing method. 3. A character and figure processing method for creating data for preparing each color plate for color printing by decomposing a character and figure in a halftone dot, and a halftone dot of each color plate obtained based on information of the character and figure color. Character pattern processing method characterized by adding the contour of a character to the color plate having the maximum halftone dot area ratio among the area ratio and the halftone dot area ratio of each color plate obtained based on the background color information. . 4. The character / graphics processing method according to claim 3, wherein, in the color plate having the maximum halftone dot area ratio, the halftone dot area of the color plate obtained based on background color information. When the ratio is larger than the halftone dot area ratio of the color plate obtained based on the information of the character graphic color, the outline of the character graphic is added to the outside of the character graphic, and when it is smaller, the outline of the character graphic is added. Character figure processing method. 5. The character / graphics processing method according to claims (1) to (4), wherein the thickness of the outline of the character / graphics to be applied is controlled according to the halftone dot area ratio. Characteristic character and graphic processing method.