JPS6158090A - Data output system for monochromatic hard copy device - Google Patents

Abstract

PURPOSE:To permit a copy without the specification of a perspective color when the hard copy of a color display device is copied by a monochromatic hard copy device by interrupting the output to the hard copy device of display dat4a read by a memory when the color of display data and the perspective color are the same. CONSTITUTION:Display info6rmation including a color dispatched to a hard copy device through a OR circuit 5 from a register 4 are also dispatched to a comparison circuit 7 as well from the register 4. On the other hand, a perspective color designated from a perspective color register 6 is read and dispatched to a comparison circuit 7. The comparison circuit 7 is compared with display data dispatched from the register 4 and a perspective color dispatched from a color register and dispatches the output to an NOT circuit 8 when both colors is the same. Consequently, the output of display information at that time to the monochromatic hard copy device is interrupted by an AND circuit 9.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for sending display information including colors from a display device capable of color display to a hard copy device to make a hard copy, and in particular for displaying graphics, etc. This invention relates to an information output method for a monochrome hard copy device when a color is specified for the background.

In recent years, with the spread of various information processing devices, various display devices have been developed and put into practical use, and in particular, display devices capable of color display have come into widespread use. Various hard copy devices are also used to print and record the display contents of the display device.

Although some hard copy devices are capable of color printing, monochrome hard copy devices are often used due to cost considerations. On the other hand, in a color display device, a color may be specified for the background depending on the display content.

Since a monochrome hard copy device prints all color-specified display content in black, if a color is specified for the background, it is printed in black, so there is no distinction between the background color and display content such as display figures. Therefore, countermeasures are required, but it is desirable that they be simple.

[Conventional technology]

The output control circuit that sends display information from a conventional color display device to a monochrome hard copy device outputs the logical sum of the colors red, 5't, and green to the car. When a color is specified for the screen, the entire screen will be printed in black when a hard copy is made using a monochrome hard copy device.

FIG. 2 is a circuit block diagram showing an example of a conventional hard copy output control circuit.

When a background color is specified, the specified color among red, blue, and green is stored in the background color register 6 via lotus A. This designated color is read out from the background color register 6 and stored separately for each color of red, blue, and green through a path in the bitmap memories 1 to 3 that store display data.

That is, the red background color is stored in the red memory 1, the blue background color in the blue memory 2, and the green background color in the line memo I73.

Also, of the display figures etc. that enter via the bus A, the red portion is stored in the red memory 1, the blue portion is stored in the blue memory 2, and the green portion is stored in the line memory 3.

The display figures, etc. and background colors stored in the red memory 1, blue memory 2, and line memo I73 are once stored in the register 4, and then hard-copied from the "+" child B via the OR circuit 5. sent to the device.

In a monochrome hard copy device, display contents for which a color is specified are printed in black, and display contents for which no color is specified are output as white without being printed. Therefore, in the case of the display graphics and the background color sent from terminal B, the entire screen is printed in black.

[Problem that the invention seeks to solve]

As mentioned above, conventionally, when a background color is specified, there is a problem in that a monochrome hard copy device cannot make a hard copy of the displayed content.

Therefore, if the background color is not specified, or if it is specified, the software controls the hard copy to be taken without specifying the background color, which is extremely troublesome.

[Means for resolving issues]

The above problem requires a means for storing a specified background color, a memory for storing display information including the color to be displayed, and a means for comparing the background color with the color of the display information successively retrieved from the memory. The problem is solved by preventing the display information read from the memory from being output to the hard copy device when the color of the display information and the background color are the same.

(Operation) That is, when writing a background color to the bitmap memory of a color display device, the background color is stored in the background color register, and the output of this background color register and the display information read from the memory are used. When the two colors match, the display information is regarded as the background and is not sent to the monochrome hard copy device.

〔Example〕

FIG. 1 is a block diagram of a circuit showing an embodiment of the present invention.
Components having the same functions as those in FIG. 2 are indicated by the same reference numerals.

The present invention utilizes the fact that the circuit shown in FIG. 2 includes a background color register that stores the background color, and provides a circuit for preventing the sending of the background color to the monochrome hard copy device.

That is, the display information including colors sent from the register 4 to the hard copy device via the OR circuit 5 is also sent from the register 4 to the comparison circuit 7. On the other hand, the specified background color is successively outputted from the distal controller and sent to the comparator circuit 7.

Comparison circuit 7 compares the display information sent from register 4 and the background color sent from background color register, and sends an output to NOT circuit 8 when the two colors match. Therefore, N
Since the output of the OT circuit 8 turns off the AND circuit 9, the AND circuit 9 prevents the display information at that time from being sent to the monochrome hard copy device.

〔Effect of the invention〕

As explained above, the present invention can be carried out without any problem when a hard copy of a color display device is taken by a monochrome hard copy device, even if a background color is specified.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a circuit showing an embodiment of the present invention, and FIG. 2 is a block diagram of a circuit showing an example of a conventional hard copy output control circuit. In the figure, 1 is the red memory, 2 is the blue memory, 3 is the edge memory, 4 is the register, 5 is the OR circuit, 6 is the background color register, 7 is the comparison circuit, 8 is the NOT circuit, and 9 is the AND circuit. It is.

Claims (1)

[Claims] comprising means for storing a specified background color, a memory for storing display information including the color to be displayed, and means for comparing the color of the display information read from the memory with the background color,
An information output method for a monochrome hard copy device, characterized in that when the color of the display information and the background color are the same, output of the display information read from the memory to the hard copy device is inhibited.