JPH0514697A - Color copy contrtoller - Google Patents

Abstract

PURPOSE:To obtain color copy in a desired color different from a color used on a screen. CONSTITUTION:The controller is provided with a color conversion table 3 converting R(red), G(green), B(blue) signals into Y(yellow), M(magenta), C(cyan) signals, a data transmission section 5 outputting the converted Y, M, C signals to a hard copy device 7 and a table rewrite section (microcomputer 1) rewriting the conversion rule of the R,G,B signals in the color conversion table into the Y.M.C signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color copy control device for controlling a color copy device which outputs screen information as a hard copy.

[0002]

2. Description of the Related Art A color CRT using a color copying machine
When printing the contents of a screen such as a monitor, the three primary colors of R (red), G (green), and B (blue) are printed in hard copy yellow (Y), magenta (M), and cyan (C). Convert to 3 primary colors. Further, when such a hard copy is printed with seven colors, the three primary colors YMC are mixed to represent each color of red, green, yellow, blue, magenta, cyan, and black.

Conventionally, when making a hard copy of this color image, the color displayed on the CRT monitor is compared with the hard copy by using a look-up table (hereinafter referred to as a color conversion table) that associates RGB signals with YMC signals. Then, the color was simply converted and displayed.

[0004]

However, although yellow or the like is a color that is very easy to see on the screen, it is very difficult for humans to see when it is taken as a hard copy. For this reason, conventionally, when it is necessary to take screen information using yellow in a hard copy, it is necessary to devise not to use a color that is difficult to see in a hard copy such as yellow when creating screen information. However, there was a problem that the workability was extremely poor.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a color copy control device capable of performing color copying with a desired color different from the color used on the screen. Especially.

[0006]

In order to achieve the above object, a color copy control apparatus according to the present invention uses R (red), G (green) and B (blue) signals as Y (yellow) and M ( (Magenta), C (cyan) color conversion table for conversion, and selected Y, M,
A signal sending unit for outputting the C color signal to the hard copy device, and a table rewriting unit for rewriting the conversion rule from the R, G, B signals to the Y, M, C color signals in the color conversion table in response to an external command. It is characterized by including.

[0007]

According to the above construction, when the screen information using a color that is hard to see on a hard copy such as yellow is color copied, the table rewriting section rewrites the corresponding conversion rule in the color conversion table. As a result, it is possible to make a color copy with a desired color different from the color used on the screen.

[0008]

1 is a block diagram showing an embodiment of a color copy control apparatus according to the present invention.

The illustrated color copy control device is configured with a microprocessor 1 as a control center, a RAM 2 and
A color conversion table 3, a hard copy memory 4, a data transmission unit 5, and a host interface 6 are provided, and R
The GB signal is color-converted into a YMC signal and supplied to the hard copy device 7.

The RAM 2 stores a program and is used as a working area.

The color conversion table 3 is a look-up table for converting RGB signals for color monitor into YMC signals for hard copy bit by bit, and FIG.
As shown in FIG. 3, conversion rules for converting RGB signals into YMC signals are stored in a matrix and rewritably in advance, and the color-converted YMC signals are supplied to the hard copy memory 4 bit by bit.

The hard copy memory 4 is provided with planes for Y signal, M signal and C signal, and the color conversion table 2 is provided.
The color signals converted by the Y signal, the M signal, and the C signal in dot units
Store for each signal.

The data sending unit 5 is a hard copy memory 4
The data is taken out in the order of Y (yellow) M (magenta) C (cyan) from each plane of the hard copy device 7
Output to.

The host interface 6 inputs data setting, mode setting, or various commands from a host device (not shown) and notifies the microprocessor 1 of the input.

The microprocessor 1 of this embodiment has means for rewriting the color conversion rule of the color conversion table 3 in accordance with an external command input from the host interface 6.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

When the microprocessor 1 receives a hard copy request from the host device via the host interface 7 (YES in step ST1), it outputs a data fetch command to the color conversion table 3. At this time,
If there is no request to rewrite the conversion rule in the color conversion table 3 (NO in step ST2), the color conversion table 3
Converts the input RGB signals dot by dot into YMC signals. The converted YMC signal is stored in the corresponding plane of the hard copy memory 4 (step ST3).

When the data for one copy is stored in the hard copy memory 4 (YES in step ST4), the stored data is converted into the data for hard copy through the data sending section 5, and then stored in the hard copy device 7. It is sent out and printed (step ST5).

On the other hand, if there is a conversion rule conversion request of the color conversion table 3 (YES in step ST2), the conversion rule of that portion is rewritten and changed, and then the input RGB signals are converted into YMC signals dot by dot.

For example, in the case of converting blue into yellow as shown in FIG. 3 in accordance with the regular conversion rule shown in FIG. 2, “011” is changed to “100”, and yellow is changed to blue. In the case of conversion, the data of the YMC signal is changed from "100" to "011".

In this way, the microprocessor 1 changes the data in the color conversion table 3 so as to obtain a desired print color, and then the color conversion table 3 converts the input RGB signal into a YMC signal dot by dot. To do.

[0022]

As described above, according to the present invention, since the conversion rule of the color conversion table can be rewritten,
It is possible to make a color copy with a desired color different from the color used on the screen depending on the application, thus improving usability.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a hard copy control device according to the present invention.

FIG. 2 is a configuration diagram showing an example of a color conversion table.

FIG. 3 is a configuration diagram showing a color conversion table after data change.

FIG. 4 is a flowchart illustrating the operation of the embodiment of the present invention.

[Explanation of symbols]

 1 Microprocessor 2 RAM 3 Color conversion table 4 Hard copy memory 5 Data sending unit 6 Host interface 7 Hard copy device

Claims (1)

Claims: 1. A color conversion table for converting R (red), G (green) and B (blue) signals into Y (yellow), M (magenta) and C (cyan) signals. A signal sending unit for outputting the converted Y, M, C signals to a hard copy device, and conversion of R, G, B signals in the color conversion table into Y, M, C signals in response to an external command. A color copy control device comprising: a table rewriting section for rewriting rules.