JPS61175818A - Correcting system of color information to color hard copy device - Google Patents

Abstract

PURPOSE:To print a data by a hue being approximate to a hue displayed by a color display device, by displaying the contents of a look-up table, updating its contents, and making a color hard copy device execute printing. CONSTITUTION:Usually a display data of a display use bit map memory 2 is converted to a video signal by a video circuit 4 through a selection controlling circuit 13, and displayed on a display part 5. Also, a color level is given by a look-up table 8 and sent out to a color hard copy device 12. By an instruction of a color designating data from an inputting circuit 11 to which a keyboard is connected, a processor 9 controls the circuit 13, and displays the contents of the table 8 on the display part 5 through the circuit 4. An operator moves a cursor to a place where it is desired to update the contents of the displayed table 8, inputs a numerical value of a color level corresponding to a color number from the circuit 11, and corrects an initial value of the table 8.

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 color display device to a color hard copy device to make a hard copy. The present invention relates to a color information correction method for a color hard copy device that enables output of displayed contents in a desired color tone.

2. Description of the Related Art 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, color display devices capable of color display have come into widespread use. Various color hard copy devices are also used to print and record the display contents of the color display device.

By the way, in a color display device, multicolor display is possible by increasing the bitmap memory and expanding the level specification range for each of the three primary colors red, blue, and green, but it is not possible to send this display content to a color hard copy device. When printing, color hard copy devices are usually able to express fewer colors than color display devices can display due to the limited number of colors.

Therefore, the colors printed by the color hardcopy device and
Although the color tone displayed by the color display device may differ, it is desirable to be able to print as close to the color tone of the color display device as possible.

[Conventional technology]

FIG. 4 is a block diagram showing an example of a circuit of a conventional color display device.

The processor 9 operates by reading a program stored in the control memory 10, and controls the address control circuit 6 to write an address into the write bitmap memory 1 based on instructions from an input circuit 11 consisting of a keyboard or the like. send out,
Write display data.

Here, the processor 9 controls the display bitmap memory 2 via the control circuit 7, and copies the display data written in the write bitmap memory 1.

The display data copied to the display bitmap memory 2 is given each color level of the three primary colors of red, blue, and green to each pixel stored in the lookup table 3 under the control of the control circuit 7, and then sent to the video circuit 4. will be sent to.

The display data converted into a video signal by the video circuit 4 is
The color is displayed on the display unit 5 using color development based on the color level of each color given in the lookup table 3.

The processor 9 also controls the control circuit 7 to read display data from the display bitmap memory 2 based on an instruction to take a hard copy inputted from the input circuit 11, and reads out display data from each pixel stored in the lookup table 8. 4 against
~Gives each color level of 7 colors, color hard copy device 1
2 and make a color hard copy.

[Problem that the invention seeks to solve]

The look-up table 3 stores the levels of each color for the three primary colors of light, and the combination of these color levels can produce many different colors, which can be specified by the look-up table 8 for the color hard copy device 12. Due to economic issues with the color hard copy device 12, the number of colors is usually four, and in addition to the three primary colors yellow, cyan, and magenta, there are also seven colors, including colors created by mixing two of these three primary colors. This is the extent to which it is possible to specify the color development of a certain color.

Therefore, the number of colors that can be printed by the color hard copy device 12 is smaller than the number of colors displayed on the display section 5, and the color hard copy device 12 can print only one color for several colors displayed on the display section 5. Therefore, there is a problem in that delicate hues cannot be expressed by the color hard copy device 12, and it is also impossible to specify a desired hue.

[Means for solving problems]

The above problem can be solved by providing means for switching display data from the contents of a lookup table for a color hard copy device, and means for writing color specification data into the lookup table, and displaying the contents of the lookup table. This problem is solved by a color information correction method for a color hard copy device according to the present invention, which updates the content and causes the color hard copy device to print.

[Effect]

That is, by displaying the contents of the lookup table on the color hard copy device, inputting color specification data using keys on the keyboard or a dedicated switch, and rewriting the contents of the lookup table with this input, the color display device can display the contents. The display data can be printed in a color tone that is similar to the color tone that is being used.

〔Example〕

FIG. 1 is a block diagram of a circuit showing an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of the lookup table 8.

In FIG. 1, a selection control circuit 13 is added to FIG. 4, making it possible to display the contents of a look-up table 8 on a display unit 5.

Normally, the display data in the display bitmap memory 2 is converted into a video signal by the video circuit 4 via the selection control circuit 13 as explained in FIG. 4, and then displayed on the display section 5. Further, the color level is given by the lookup table 8 and sent to the color hard copy device 12.

The processor 9 controls the selection control circuit 13 in response to instructions of color designation data from the input circuit 11 to which the keyboard is connected, and displays the contents of the lookup table 8 as shown in FIG. 2 on the display unit 5 via the video circuit 4. do.

The color numbers in FIG. 2 indicate that when the level of each color is represented by 4 bits, it can be specified in 16 steps from ■ to F. Color number 1 (■) has the yellow, cyan, and magenta color levels all 0, so the color is blank and becomes the background color. ■ indicates that magenta is designated at the highest level, F, and is the darkest magenta color.

■ and ■ are the same as above, ■ is the darkest cyan color, and ■ is the darkest yellow. Color number F is black because the color levels of yellow, cyan, and magenta are all F.

The operator moves the cursor to the location where the content of the lookup table 8 displayed on the display unit 5 is desired to be updated, inputs the numerical value of the color level corresponding to the color number from the input circuit 11, and sets the initial value of the lookup table 8. Correct.

For example, in color number 1■, the magenta color level is the highest
If the color is too dark, the numerical value F specifying the magenta color level is updated to A, for example.

FIG. 3 is a block diagram of a circuit showing another embodiment of the present invention.

FIG. 3 is a diagram in which a dip switch 14 is added to FIG. That is, for example, in the case of the content shown in FIG. 2, a total of 48 switches are provided, 16 for each color of yellow, cyan, and magenta.

As described above, the contents of the look-up table 8 are displayed on the display section 5, and the dip switch 14 is operated to set and update the initial value of the corresponding color level. In this case, the color level can be easily updated without placing much burden on the display device.

〔Effect of the invention〕

As explained above, since the present invention can update the contents of the lookup table for specifying the color of a color hard copy device, it is possible to make a hard copy in a color close to the hue displayed by the color display device. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a circuit showing one embodiment of the present invention, FIG. 2 is a diagram explaining an example of a lookup table 8, FIG. 3 is a block diagram of a circuit showing another embodiment of the present invention, FIG. 4 is a block diagram showing an example of a circuit of a conventional color display device. In the figure, 1 is a write bitmap memory, 2 is a display bitmap memory, 3.8 is a lookup table, 4 is a video circuit, 5 is a display section, 6 is an address control circuit, 7 is a control circuit, 9 10 is a processor, 10 is a control memory, 11 is an input circuit, 12 is a color hard copy device, 13 is a selection control circuit, and 14 is a DIP switch.

Claims (1)

[Claims] In a color display device capable of sending multicolor display data to a color hardcopy device to make a hard copy, there is provided a means for displaying the contents of a lookup table for the color hardcopy device, and a means for displaying color specification data. and means for writing into the lookup table, displaying the contents of the lookup table, updating the contents, and causing the color hardcopy device to print. method.