JPH0514749A - Color copy controller - Google Patents

Abstract

PURPOSE:To select both a color and a monochrome at the time of obtaining a hard copy from a color picture by providing a color converting part and a monochrome converting part so that both of them can be selected. CONSTITUTION:When a hard copy request is a color printing request, a microprocessor 1 selects a color conversion table 2 through a selector 5, and outputs the input starting command of an RGB signal from a CRT monitor. On the other hand, when the hard copy request is a monochrome printing request, the microprocessor 1 selects a monochrome conversion table 3 through the selector 5, and outputs the input starting command of RGB signal. The inputted RGB signal is converted into a YMC signal by the table 2 or 3 when its own is selected, and the YMC signal is stored in a hard copy memory 4. When a data fetch for one screen is completed by the memory 4, the data are outputted through a shifter 6 to a hard copy device 8.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a color copy control apparatus for obtaining a color hard copy from a color display image.

[0002]

2. Description of the Related Art A color CRT using a color copying machine
When printing the contents such as screen, R (red), G
The three primary colors of (green) and B (blue) are converted into the three primary colors of yellow (Y), magenta (M), and cyan (C) for hard copy printing. 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]

[Problems to be Solved by the Invention] However, a CRT
Blue and yellow on the monitor are very clear and easy to see, but if you take these blue and yellow as hard copy and try to make many copies with a copier, it will be difficult to copy clearly There is a problem.

Further, once the color conversion table is set, the conversion rule from the RGB signal to the YMC signal cannot be changed, and blue or yellow is also printed as it is.

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 selecting either color or monochrome when a hard copy is made from a color image. Especially.

[0007]

In order to achieve the above object, a color copy control apparatus according to the present invention applies R (red), G (green), B (blue) color signals to Y signals.
A color conversion unit for converting (yellow), M (magenta), and C (cyan) color signals, a monochrome conversion unit for converting R, G, and B color signals into monochrome signals, and R, G, and B When a color signal is supplied, Y, M,
A selection unit for selecting either the C color signal or the monochrome signal and a signal transmission unit for outputting the Y, M, C color signal or the monochrome signal selected by the selection unit to the hard copy device. It is a thing.

[0008]

According to the above construction, even when the R, G, B color signals which are unclear in the hard copy are supplied, the monochrome conversion section can convert them into a monochrome signal to obtain a monochrome copy. Further, when a color copy is not required, a monochrome copy can be easily obtained.

[0009]

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

The color copy control apparatus shown in the figure is configured with a microprocessor 1 as a control center, and has a color conversion table 2, a monochrome conversion table 3, a hard copy memory 4, a selector 5, a shifter 6, and a host interface 7. And the RGB signals are color-converted or monochrome-converted and supplied to the hard copy device 8.

The color conversion table 2 is a hard copy Y for each RGB signal for color display.
It is a table for converting into an MC signal, and the color-converted YMC signal is supplied to the corresponding plane of the hard copy memory 4 bit by bit for each color.

The monochrome conversion table 3 receives the input R
If there is any color component in the GB signal, that is, R
When "1" is set in any bit of the GB signal, all the color signals are converted into "1" in order to make them black.

The hard copy memory 4 includes planes for Y signal, M signal and C signal, and the color conversion table 2 is provided.
Alternatively, the color signals converted by the monochrome conversion table 3 are stored for each Y signal, M signal, and C signal in dot units.

The selector 5 selects either the color conversion table 2 or the monochrome conversion table 3 in response to the switching signal from the microprocessor 1.

The shifter 6 takes out the data from the hard copy memory 4 and outputs it to the hard copy device 8.

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

When there is a hard copy request from the host interface 7 (YES in step ST1), the microprocessor 1 sends a color conversion table via the selector 5 when the hard copy request is a color printing request (step ST2 NO). 2 is selected and an RGB signal input start command is output from the CRT monitor (step ST
3). On the other hand, if the request is for monochrome printing (step S
At (T2YES), the monochrome conversion table 3 is selected via the selector 5 and the input start command of the RGB signal from the CRT monitor is output (step ST4).

When the color conversion table 2 or the monochrome conversion table 3 is selected, the input RGB signals are color converted into YMC signals and output to the hard copy memory 4 for storage (step ST5).

When the hard copy memory 4 finishes loading one screen of data (YES in step ST6), the data is output to the hard copy device 8 via the shifter 6 and printed (step ST7).

As described above, according to this embodiment, either color copy or monochrome copy can be selected in response to an external command.

[0021]

As described above, according to the present invention, in addition to the color conversion section, the monochrome conversion section is provided so that these can be selected. Therefore, when a hard copy is made from a color image, the color or monochrome is selected. Any of these can be selected, and its usability is improved.

[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 flowchart illustrating the operation of the embodiment of the present invention.

[Explanation of symbols]

 1 Microprocessor 2 Color conversion table 3 Monochrome conversion table 4 Hard copy memory 5 Selector 6 Shifter 8 Hard copy device

Claims (1)

Claims: 1. R (red), G (green), B (blue) color signals are Y (yellow), M (magenta),
A color conversion unit for converting into C (cyan) color signals, a monochrome conversion unit for converting R, G, B color signals into monochrome signals, and Y when R, G, B color signals are supplied. , A M, C color signal or a monochrome signal, and a signal sending unit for outputting the Y, M, C color signal or a monochrome signal selected by the selection unit to the hard copy device. A color copy control device comprising: