JPH0779356A - Color picture processing method and its device - Google Patents

Abstract

PURPOSE:To revise a data output characteristic dynamically in matching with the characteristic of a display output device. CONSTITUTION:A gamma value and an input masking coefficient for color correction stored in a monitor controller 40 are retrieved and extracted based on a color monitor ID number set by a dip switch 43 and sent to a host 10. The host 10 applies color correction (gamma correction and input masking) to a color picture based on the retrieved information and gives a command of picture output to a printer controller. Thus, the color picture is easily adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image processing method and apparatus therefor, and more particularly to a color image processing method and apparatus for performing color correction to output a color image.

[0002]

2. Description of the Related Art When a color image is displayed on a monitor or printed out on a recording paper, if the same image data is directly output to a color monitor display and a printer, the monitor output image and the print image will differ due to the difference in color characteristics peculiar to the device. And the colors look different.

For this reason, as a method for adjusting the tint of a printed image, a γ correction method for performing γ correction in advance on image data to be output to a printer and an input masking method for adjusting by a matrix operation have been known. There is.

FIG. 49 is a diagram showing a process of performing color reproduction processing by subjecting an original image to γ correction processing and input masking processing. In FIG. 49, reference numeral 102 denotes RGB luminance data of Cy (Cyan: cyan), Ma (Magenta: magenta), Ye (Yellow: yellow), and Bk (Black :).
This is a color reproduction processing circuit that performs conversion into black) density data, that is, color reproduction processing.

In the γ-correction method, RGB luminance data is converted into FIG.
Γ correction is performed by the γ correction circuit 100 shown in (1) and the corrected value of the γ-corrected RGB luminance data is output. FIG. 50 is a diagram showing input / output characteristics of the γ correction circuit 100. Figure 50
In, the x-axis represents the input (before γ correction) RGB brightness value, and the y-axis represents the output (after γ correction) RGB brightness value. The curve representing the relationship between x and y is represented by the function shown in FIG. In the function, γ is a gamma value (γ = 1.0 without correction) and K is a constant (K = 255 if the value is an 8-bit representation).

On the other hand, in the input masking method, the RGB luminance data is subjected to input masking processing by the input masking circuit 101 shown in FIG. 49, and the correction value of the RGB luminance data subjected to the input masking processing is output. The calculation by the input masking method follows the calculation formula shown below.

[0007] Here, Rin, Gin, and Bin are each color components (R
GB) input luminance values, Rout, Gout, and Bout are the respective color component (RGB) output luminance values, a ₁₁ , a ₁₂ , and a
₁₃ , a ₂₁ , a ₂₂ , a ₂₃ , a ₃₁ , a ₃₂ , and a ₃₃ are conversion coefficients.

[0008]

However, in the above-mentioned conventional example, in order to perform color correction on the output of the printer according to the device characteristics of the monitor display, in the menu setting of the printer driver, the user sets the γ value or input. Since it was necessary to select and set the masking coefficient value, the γ value and the input masking coefficient value according to the characteristics of the monitor display must be checked and reset by the user every time the connected monitor display device is changed. However, there is a problem that the operability is poor.

Especially in the current situation where many types of monitor display devices are commercially available and connectable, it is said that the user's burden is heavy in that the output characteristics must be adjusted in consideration of the characteristics of the purchased display device. Didn't get

The present invention has been made in view of the above conventional example, and an object of the present invention is to provide a color image processing method and apparatus capable of dynamically changing data output characteristics according to the characteristics of a display output device. There is.

[0011]

In order to achieve the above object, the color image processing method of the present invention comprises the following steps.

That is, there is provided a color image processing method for processing a color image and outputting the color image to a display device and a printing device, and a storage step of storing display characteristic information of connectable display devices.
A setting step of setting the type of display device to be connected for displaying a color image, a step of taking out display characteristic information of the display device based on the set type, and a color image data based on the display characteristic information. A color image processing method comprising: a color correction step of performing color correction on the first color image; and an output step of outputting the color image data subjected to the color correction to a printing device.

According to another aspect of the invention, there is provided a color image processing device for processing a color image and outputting the color image to a display means and a printing means, and a storage means for storing display characteristic information of the connectable display means. Setting means for setting the type of display means to be connected for displaying a color image, retrieval means for taking out display characteristic information of the display means from the storage means based on the set type, and based on the display characteristic information ,
A color image processing apparatus comprising: a color correction unit for performing color correction on color image data; and an output unit for outputting the color-corrected color image data to a printing unit.

[0014]

With the above-described structure, the present invention sets the type of display means to be connected, retrieves display characteristic information from the set type, and performs color correction on color image data based on the display characteristic information. Output to the printing means.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Here, four examples will be described.

<First Embodiment> [Explanation of Configuration of Color Printing System (FIGS. 1 to 4)]
FIG. 1 is a block diagram showing a schematic configuration of a color printing system which is a typical embodiment of the present invention. In FIG. 1, 10 is a host computer (hereinafter, referred to as a host), 20 is a printer controller, 30 is a printer engine, 40 is a monitor controller, and 50 is a color monitor (hereinafter, referred to as monitor).

The host 10 outputs print data, print commands, etc. to the printer controller 20 to develop the color image data into a bit map, and causes the printer engine 30 to perform a recording process. In addition, the host 10 outputs display data, display commands, etc. to the monitor controller 40 for display on the monitor 50, and the monitor controller 4
The command issued by 0 is received and analyzed. The printer engine 30 forms and outputs the data developed by the printer controller 20 on a sheet as a permanent visible image. The monitor 50 forms the visible image of the data expanded by the monitor controller 40.

In this embodiment, it is assumed that the image data supplied from the host 10 to the printer controller 20 and the monitor controller 40 is 8 bits in RGB format.

FIG. 2 is a block diagram showing a detailed configuration of the host 10. As shown in FIG. 2, the host 10 is operated by an operating system (not shown: hereinafter referred to as OS) 11 and application software (hereinafter referred to as application) 11 and a monitor driver 1 for operating a monitor controller 40 connected to the host 10.
2. A device driver such as a printer driver 13 for operating the printer controller 20 connected to the host 10 is provided. The printer driver 13 includes a command analysis unit 14 that analyzes a command sent from the monitor controller 40, and a monitor-specific color correction coefficient table storage unit 1 that stores a color correction information table according to the characteristics of the monitor 50.
5. A monitor ID address storage unit 16 for storing the addresses of the monitor-specific color correction coefficient table 15 is provided.

FIG. 3 is a block diagram showing the detailed arrangement of the printer controller 20.

The printer controller 20 includes a ROM and an R
It has a microprocessor system (not shown: hereinafter referred to as MPU) including AM, a printer engine interface (hereinafter referred to as P interface) 21 for transmitting and receiving data to and from the printer engine 30, and a color for actually performing color correction processing. A correction processing unit 22, a color reproduction information memory 23 that stores information necessary for color reproduction processing, a color reproduction processing unit 24 that actually performs color reproduction processing, a data bus 25,
A host interface (hereinafter referred to as H interface) 26 for transmitting and receiving data to and from the host 10, a control unit 27 that controls the entire controller, a command analysis unit 28 that analyzes print data and print commands sent from the host 10, A color image formed through color correction processing and color reproduction processing is transferred to Cy (Cyan) and Ma (Magenta).
: Magenta), Ye (Yellow: Yellow), Bk (Black
: Black) expansion memory 29 that expands to a bitmap of four color components, input masking coefficient storage unit 2b and γ
A color correction information memory 2a for storing information necessary for color correction processing, such as the correction table 2c, and an operation panel 2d are provided.

FIG. 4 is a block diagram showing a detailed structure of the monitor controller 40.

The monitor controller 40 is a ROM and RA.
A color monitor interface (hereinafter, referred to as M) having an MPU (not shown) including M and transmitting and receiving signals to and from the monitor 50.
Interface) 41, a monitor ID number storage unit 42 for storing an ID number for identifying the model of the color monitor connected to the M interface 41, and the ID of the color monitor
A DIP switch 43 for inputting a number, a monitor ID character string table storage unit 44 for storing a monitor ID character string table, a color correction processing unit 45 for actually performing color correction processing, a data bus 46, and transmission / reception of data with the host 10. Host interface (hereinafter referred to as H interface)
47, a control unit 48 for controlling the entire controller, a command issuing unit 49 for issuing a command to the host 10,
A command analysis section 4a for analyzing display data and display commands sent from the host 10, and a frame memory 4 for developing color image data formed through color correction processing.
b, input masking coefficient storage unit 4d and γ correction table 4
A color correction information memory 4c for storing information necessary for color correction processing such as e and an operation panel 4f are provided.

[Explanation of Various Commands (FIG. 5)] Here, commands issued by the respective constituent elements of the system having the above-mentioned configuration will be described with reference to FIG.

FIG. 5A is a diagram showing the structure of a monitor information request command issued by the printer driver 13 of the host 10. As shown in FIG. 5A, the command is composed of a command number for identifying the command.

FIG. 5B is a diagram showing the structure of a monitor information return command issued by the command issuing unit 49 of the monitor controller 40. As shown in FIG. 5B, the command is composed of a command number for identifying the command and a parameter of a monitor ID character string for specifying the monitor model.

FIG. 5C is a diagram showing the structure of a gamma correction command issued by the printer driver 13 of the host 10. As shown in FIG. 5C, the command is composed of a command number for identifying the command and a γ value parameter.

FIG. 5D is a diagram showing the structure of an input masking coefficient setting command issued by the printer driver 13 of the host 10. As shown in FIG. 5D, the command is a command number for identifying the command and the input masking coefficient a _ij (i, j = 1) described in the prior art.
~ 3) parameters.

[Description of Various Tables (FIGS. 6 to 9)] Here, the tables used by the respective constituent elements of the system having the above-described configuration will be described.

FIG. 6 shows the monitor I of the monitor controller 40.
It is a figure which shows the structure of the monitor ID character string table stored in the D character string table storage part 44. As shown in FIG. 6, the monitor ID character string table is the monitor controller 4
The monitor ID character string for specifying the model of the monitor 50 connected to 0 is stored. In this embodiment, the monitor I
There are (n + 1) model D character strings, the monitor ID 0 is in the 0th column, the monitor ID 1 is in the 1st column, ...
In the n-th column, a monitor ID n and a character string for specifying the monitor model are stored in order.

FIG. 7 shows the printer driver 13 of the host 10.
6 is a diagram showing the structure of a monitor-specific color correction coefficient table # 1 stored in the monitor-specific color correction coefficient table storage unit 15. FIG. As shown in FIG. 7, the monitor-specific color correction coefficient table #
Reference numeral 1 stores a monitor ID character string for causing the printer to perform color correction, a γ value, and an input masking coefficient according to the characteristics of the monitor. In the present embodiment, the information of the monitor ID0 is displayed at the head of the table, the monitor ID1, the monitor ID2, ..., And the monitor IDn are displayed in this order in order of the monitor ID character string, γ value, and input masking coefficient according to the model of each monitor. Stores (n + 1) models.

As for the color correction coefficient of the monitor ID 0 stored at the head of the table, as shown in FIG. 7, the γ value = 1.0 and the input masking coefficient values are
a0 ₁₁ = 1, a0 ₁₂ = 0, a0 ₁₃ = 0, a0 ₂₁ = 0, a0 ₂₂ = 1,
It is assumed that a0 ₂₃ = 0, a0 ₃₁ = 0, a0 ₃₂ = 0, and a0 ₃₃ = 1. A character string (“END” in the example of FIG. 7) indicating the end of the table is set in the last column of the table.

8 to 9 are each a γ correction table # in the γ correction table 2c of the printer controller 20.
1 is a diagram showing the internal structure of a γ correction table # 2.

As shown in FIG. 9, the γ correction table # 2 corresponds to RGB values (each component is composed of 8 bits and takes a value of 0 to 255), and these values are corrected to RGB correction values ( Each component consists of 8 bits and takes values from 0 to 255)
The value (correction value) used to convert to is stored.
That is, correction values (conversion values) for RGB values of 0 to 255 are stored, and there are as many tables as the values of γ (1.0 to α, α is a decimal value in 0.1 increments).

In the γ correction table # 1 shown in FIG. 8, the start address of the γ correction table 2 is stored in correspondence with the value of γ (γ = 1.0 to α in 0.1 steps).

[System environment setting (FIGS. 10 to 11)]
Here, the parameters set for operating the system having the above configuration will be described.

FIG. 10 is a diagram showing an example of the correspondence relationship between the ID number to be set and the monitor model. As shown in FIG. 10, for example, for model 1 (display is CRT type), the ID number is set to ID number = “1”, and for model 2 (display is LCD type), the ID number is set to “2”. .

FIG. 11 shows the monitor I on the DIP switch 43.
It is a figure which shows a mode that a D number is set. In FIG. 11, on of the DIP switch 43 is a binary number “1”, o
ff means binary "0". In the example of FIG. 11, it is possible to input a 4-digit binary number (16 ways) with a combination of on / off of four switches. Figure 11
(A) is a DIP switch 4 when the monitor corresponding to the ID number = "1" is connected to the monitor controller 40.
The setting of 3 is shown. In this case, the dip switch 43 is 2
The decimal number represents “0001”, that is, the decimal number represents “1”. FIG. 11B shows the setting of the DIP switch 43 when the monitor corresponding to the ID number = “15” is connected to the monitor controller 40. In this case, the dip switch 43 is “1111” in binary, that is, “15” in decimal.
Is represented. The value input with the DIP switch 43 is
It is stored in the monitor ID number storage unit 42 by the control unit 48.

[Description of Color Image Output Process (FIGS. 12 to 19)] The color image output process executed by the system having the above configuration will be described below with reference to a flowchart.

(1) Outline of color image output processing (see FIG. 1)
2) FIG. 12 is a flow chart showing an outline of a process for performing color print output to a printer based on the type information of the monitor 50 connected to the monitor controller 40 in accordance with the device characteristics of the monitor.

First, in step S1, the host 10 executes a process of extracting a monitor ID character string indicating the model of the monitor connected to the monitor controller 40. next,
In step S2, the command issued by the command issuing unit 49 of the monitor controller 40 is transferred to the H interface 47.
Read into the host 10 via. Then, step S3
Then, the command read in step S2 is analyzed by the command analysis unit 14 of the printer driver 13.

The processing is performed in step S4 in step S4.
It is checked whether the command analyzed in 3 is a correct monitor information return command. Here, for example, the monitor ID
If the analyzed command is not correct, as in the case where no character string is attached, the process proceeds to step S6.
On the other hand, if the analyzed command is correct, the process proceeds to step S5.

In step S5, the monitor ID character string in the monitor-specific color correction coefficient table # 1 shown in FIG.
A process of storing in the monitor ID address storage unit 16 the address of the pointer that matches the monitor ID character string of the read monitor information return command is executed. Also, step S
6, the pointer is set at the head of the monitor-specific color correction coefficient table # 1 shown in FIG. 7, the process proceeds to step S7, and the address of the pointer set in step S6 is set to the monitor ID
The address is stored in the address storage unit 16.

Finally, in step S8, color correction processing is executed in the printer controller 20, and an image matching the color characteristics of the monitor is output on recording paper.

In this way, the color characteristic information of the monitor is output to the printer controller on the basis of the obtained model information of the monitor to perform the color correction processing, and an image matching the color characteristic of the monitor is recorded on the recording paper. Can be printed.

(2) Monitor Information Retrieval Processing (FIG. 13) Next, details of the monitor information retrieval processing executed in step S1 will be described with reference to the flowchart shown in FIG.

First, in step S10, the printer driver 13 of the host 10 issues the monitor information request command shown in FIG. 5A to the monitor controller 40. Next, in step S11, the monitor controller 4
The monitor information request command issued in step S10 is read via the H interface 47 of 0.

At step S12, the monitor information request command read at step S11 is analyzed by the command analysis section 4a of the monitor controller 40, and further at step S12.
In 13, the pointer is set at the head of the monitor ID character string table stored in the monitor ID character string table storage unit 44.

In step S14, it is checked whether the command analyzed in step S12 is correct. Here, if the command is not a correct monitor information request command, for example, if it has extra parameters,
The process proceeds to step S18. On the other hand, if the command is a correct monitor information request command,
The process proceeds to step S15.

Now, in the process, in step S15, the value of the monitor ID number storage unit 42 is taken out. Here, the value stored in the monitor ID number storage unit 42 is already determined corresponding to the model of the color monitor connected to the monitor controller as described with reference to FIG.
It is the numerical value input from the DIP switch 43. In step S16, the pointer of the monitor ID character string table is advanced by the value extracted in step S15, and in step S17, the monitor ID character string pointed to by the pointer is extracted. On the other hand, in step S18, the monitor ID character string of the model 0 pointed to by the pointer is taken out.

In step S19, the monitor ID character string extracted in step S17 or step S18 is set as the parameter of the monitor information return command shown in FIG. 5B. Finally, in step S20, the monitor information return command prepared in step S19 is issued to the host 10 via the H interface 47 using the command issuing unit 49 of the monitor controller 40, and the process is terminated.

In this way, the printer driver 13 of the host 10 issues a monitor information request command to the monitor controller 40, and the monitor controller 40 that has read the monitor information request command corresponds to the monitor 50 to which the monitor controller 40 is connected. Set the monitor ID character string to the parameter of the monitor information return command, and restart the host 1
The process of issuing 0 is executed. by this,
The printer driver 13 of the host 10 can obtain information specifying the model of the monitor connected to the monitor controller 40.

(3) Monitor ID Pointer Address Retrieval Process (FIG. 14) Here, details of the monitor ID pointer address retrieval process executed in step S5 will be described with reference to the flowchart shown in FIG.

First, in step S21, a monitor ID character string is extracted from the monitor information return command (FIG. 5B) analyzed in step S3. Next, in step S22,
A pointer is set at the head of the monitor-specific color correction coefficient table # 1 (FIG. 7) stored in the monitor-specific color correction coefficient table storage unit 15 of the printer driver 13.

In step S23, the monitor ID character string pointed to by the pointer is compared with the character string indicating the end of the table ("END" in the example of FIG. 7). Here, when the two character strings match, the process proceeds to step S26, the pointer is set at the head of the monitor-specific color correction coefficient table # 1, and the process proceeds to step S27. On the other hand, if the two character strings do not match, the process proceeds to step S24.

In step S24, the monitor ID character string pointed to by the pointer is further compared with the monitor ID character string extracted from the monitor information return command in step S21. Here, if the two character strings do not match, the process proceeds to step S25, the pointer is advanced to the next monitor ID character string in the monitor-specific color correction coefficient table # 1, and the process returns to step S22. On the other hand, if the two character strings match, the process proceeds to step S27.

Finally, in step S27, the address of the pointer is stored in the monitor ID address storage unit 16 and the process is ended.

In this way, the address where the color correction information of the monitor model that matches the monitor ID character string set in the parameter of the received monitor information return command is stored is the monitor-specific color correction coefficient table # 1. The monitor ID character string is searched and stored in the monitor ID address storage unit 16.

(4) Color-to-printer color correction processing (FIGS. 15 to 19) Here, details of the color-to-printer color correction processing executed in step S8 will be described with reference to the flowcharts shown in FIGS.

Outline of Color Correction Process (FIG. 15) First, the outline of the color correction process will be described with reference to the flowchart shown in FIG.

FIG. 15 is a flowchart of the color correction process for the printer in step S8. In this process, RGB luminance format raster image data (1
For each RGB color component per pixel represented by 8 bits), the γ correction processing and the input masking processing described in the prior art are performed to output the image data in color.

In step S30, preprocessing for γ correction for the printer controller is executed. The details will be described later with reference to the flowchart shown in FIG. In step S31, preprocessing for input masking to the printer controller is executed. The details are shown in Figure 1.
This will be described later with reference to the flowchart shown in FIG. In step S32, one pixel (pixel) data of the raster image data of RGB luminance format is read.

Next, in step S33, a γ correction process is performed on the printer controller. The details will be described later with reference to the flowchart shown in FIG. Further, in step S34, an input masking process for the printer controller is executed. The details will be described later with reference to the flowchart shown in FIG.

In step S35, steps S33 to S33 are performed.
The color reproduction processing unit 24 of the printer controller 20 uses the correction values of the RGB luminance data corrected in S.
e and Bk are converted into density data, and in step S36,
Based on the values of the respective color components of Cy, Mg, Ye, Bk, Cy, Mg,
Bitmap memory expansion is executed for each of the Ye and Bk color components.

In step S37, it is checked whether processing of all pixel data of the raster image data has been completed. Here, if it is determined that the process is not completed, the process returns to step S32, and if it is determined that the process is completed, the process proceeds to step S38.

Finally, in step S38, the expanded bitmap data is transferred to the printer engine 30 via the P interface 21, and color printing is performed to eject the paper.

In this way, the gamma correction processing and the input masking processing are applied to the raster image data in the RGB luminance format, and the color image is output.

.Gamma.-correction preprocessing (FIG. 16) Here, details of the .gamma.-correction preprocessing will be described with reference to the flowchart shown in FIG.

First, in step S40, the monitor ID address storage unit 16 of the printer driver 13 is read from the monitor I
The address in which D is stored is taken out. Step S4
In step 1, the pointer is set to the address fetched in step S40 (the pointer is set in the information of any monitor model in the monitor-specific color correction coefficient table # 1 (FIG. 7)), and in step S42, the pointer is set. The γ value pointed to by is taken out.

Next, in step S43, step S42
The .gamma. Value fetched from the .gamma. Value is set in the parameter of the .gamma. In step S44, the printer controller 20 reads the γ correction command issued in step S43 via the H interface 26, and further in step S45.
Then, the read γ correction command is analyzed by the command analysis unit 28 of the printer controller 20.

In step S46, it is checked whether the analyzed command is a correct γ correction command. Here, if it is determined that the command is the correct γ correction command, the process proceeds to step S47, where γ
After the pointer is addressed to the head of the correction table # 1 (FIG. 8), the γ value is extracted from the analyzed γ correction command, and the pointer is advanced to the address storage location corresponding to the value, and the content indicated by the pointer (γ correction Table # 2 (Figure 9)
(Start address of) is taken out. On the other hand, when it is determined that the command analyzed in step S45 is not the correct γ correction command (for example, the parameter value is out of range), the process proceeds to step S48, and the γ correction table # 1
A pointer is set at the head of (FIG. 8) and the head address of the γ correction table # 2 (FIG. 9) with γ = 1.0 is taken out. After the processing of step S47 or S48, the processing is step S4.
Proceed to 9.

In step S49, step S47 or S
The pointer is set to the head address of the γ correction table # 2 fetched at 48, and the processing is ended.

In this way, the printer driver 13 of the host 10 issues a γ correction command to the printer controller 20, the printer controller 20 analyzes the γ correction command, and accesses the table for changing the γ correction. Can be done.

Input Masking Preprocessing (FIG. 17) Here, the input masking preprocessing will be described with reference to the flowchart shown in FIG.

First, in step S50, the monitor I address is stored in the monitor ID address storage section 16 of the printer driver 13.
The address in which D is stored is taken out. Step S5
In 1, the pointer is set to the address fetched in step S50 (that is, the monitor-specific color correction coefficient table # 1).
(A pointer is set in the information of any monitor model in FIG. 7), and in step S52, the input masking coefficient pointed to by the pointer is taken out.

In step S53, the fetched input masking coefficient is set in the parameter of the input masking coefficient setting command (FIG. 5D), and the command is issued from the printer driver 13 to the printer controller 20. In step S54, the printer controller 20 reads the issued input masking coefficient setting command via the H interface 26, and in step S55, the command analyzing unit 28 of the printer controller 20 analyzes the read input masking coefficient setting command. .

In step S56, the analyzed
Command is correct input masking coefficient setting command
Find out if Where that command is the correct input
Not a masking coefficient setting command (eg parameter
When it is determined that the value is out of the range), the process is step S58.
To the value of each input masking coefficient₁₁= 1, a ₁₂
= 0, a₁₃= 0, a_{twenty one}= 0, a_{twenty two}= 1, a_{twenty three}= 0, a₃₁
= 0, a₃₂= 0, a₃₃Input masking by setting = 1
The coefficient is stored in the coefficient storage unit 2b, and the process ends. On the other hand
The analyzed command is the correct input masking factor.
If the command is determined to be a setting command, the process proceeds to step.
Proceed to S57, and analyze the input masking coefficient setting command
Input masking coefficient (a_ij, I, j = 1 to 3)
It is taken out and stored in the input masking coefficient storage unit 2b.
Pay and finish the process.

In this way, the printer driver 13 of the host 10 issues the input masking coefficient setting command to the printer controller 20, the printer controller 20 analyzes the input masking setting command, and stores the input masking coefficient. It is stored in the section 2b.

.Gamma. Correction Processing (FIG. 18) Here, the .gamma. Correction processing will be described with reference to the flowchart shown in FIG.

First, in step S60, step S32
The value of the R component is extracted from the RGB color components read in step 1, and the pointer that points to the beginning of the γ correction table # 2 (FIG. 9) is set to the value of the R component (it takes a value of 0 to 255 in 8-bit representation). Advance the minute pointer. In step S61, the content of the address pointed to by the pointer is fetched from the γ correction table # 2. This is the correction value for R. In step S62, the pointer is returned to the beginning of the γ correction table # 2 (FIG. 9) for the next process.

Next, in step S63, step S32
The value of the G component is extracted from the RGB color components read in step S3, and the pointer that points to the beginning of the γ correction table # 2 (FIG. 9) is set to the value of the G component (8-bit representation takes a value of 0 to 255). Advance the minute pointer. In step S64, the content of the address pointed to by the pointer is fetched from the γ correction table # 2. This becomes the G correction value. In step S65, the pointer is returned to the beginning of the γ correction table # 2 (FIG. 9) for the next process.

Similarly, in step S66, step S3
Of the RGB color components read in step 2, the value of the B component is taken out, and the pointer pointing to the beginning of the γ correction table # 2 (FIG. 9) is set to the value of the B component (values of 0 to 255 in 8-bit representation). ) Advance the minute pointer. In step S67, the content pointed to by the pointer is retrieved from the γ correction table # 2. This is the correction value for B.

In this way, the correction value of each of the RGB components obtained by the γ correction processing for one pixel is obtained.

Input Masking Process (FIG. 19) Here, the input masking process will be described with reference to the flowchart shown in FIG.

In step S70, steps S61 and S
64, and the correction values of the RGB color components obtained in S67 are extracted, and in step S71, the input masking coefficient stored in step S57 or S58 is extracted from the input masking coefficient storage unit 2b, and a _ij (i, j = 1
Set to 3). In step S72, the matrix calculation described in the related art is performed, the input masking process is performed, the correction values of the RGB color components are obtained, and the process is ended.

In this way, the correction value of each of the R, G, and B components on which one pixel is subjected to the input masking process can be obtained.

Therefore, according to the present embodiment, the information regarding the model of the connected monitor device is read from the monitor controller, and the color correction coefficient table corresponding to the model is searched and read based on the information, and the γ correction processing and Input masking processing can be performed.

In this embodiment, the monitor ID for identifying the monitor device to be connected is described as being obtained by the combination of on / off of the dip switch 43 provided in the monitor controller 40, but the present invention is not limited to this. is not. For example, if the monitor ID is the monitor 50
It can also be obtained by receiving a specific signal output from the M interface 41.

FIG. 20 is an example showing how an output signal is input to the M interface 41 from the monitor 50 to be used as the monitor ID. As shown in FIG. 20, four output signal lines are output from the monitor 50, and the four signal lines are input to the input port of the M interface 41 of the monitor controller 40. Here, each of the four signal lines can transmit a signal in the “high (H)” state or the “low (L)” state, and four signal lines form 16 types of signal patterns. Obtainable. Here, the signal in the "H" state is a binary 1
The signals in the "L" state are made to correspond to binary 0s, respectively.
Further, the control unit 48 of the monitor controller 40 reads the state of the signal line connected to the M interface 41 and stores the value in the monitor ID number storage unit 42.

In the example of FIG. 20, the monitor 50 outputs the signal "LLLH" through the four signal lines. That is, 2
It indicates that the M interface 41 inputs a value of "0001" in a decimal number and "1" in a decimal number expression.

The monitor ID is the monitor controller 4
The apparatus can be configured so that the monitor ID number is selected and input from the operation panel 4f of 0 and stored in the monitor ID number storage unit.

FIG. 21 is a view showing an example of the operation panel 4f of the monitor controller 40. Here, the monitor ID number displayed is changed by operating the monitor type selection switch (for example, if the push button is a numeric value), the displayed monitor ID number is input. The control unit 48 of the monitor controller 40 takes out the monitor ID number input from the operation panel 4f and outputs the value as the monitor I
It is stored in the D number storage unit 42. In FIG. 21, the monitor type selection switch is operated to set the value of the monitor ID number to 1
Indicates that you are entering. The selected monitor ID number "1" is displayed on the LCD.

<Second Embodiment> In the first embodiment, the color correction processing is executed based on the γ value according to the monitor model, but in the present embodiment, the host 10 causes the printer controller 20 to perform γ for each image data input value. A case where a correction value is supplied and the γ correction characteristic is arbitrarily changed will be described.

In this embodiment also, the same system as that used in the first embodiment is used, and the same device reference numerals are used for the respective parts that are common to the first embodiment, and here, Only the parts unique to this embodiment will be described. Also in the flowchart described in this embodiment, the same step reference numbers are assigned to the same processing steps as those in the first embodiment, and the description thereof will be omitted. Here, only the processing steps characteristic of this embodiment will be described. To do.

[Description of Command (FIG. 22)] FIG. 22 is a diagram showing the format of the γ correction command according to the present embodiment. As shown in FIG. 22, a command number indicating that the command is a γ correction command and an input value (“0”)
To “255”) correction value (converted value) γ (n)
(N = 0 to 255).

[Description of various tables (FIGS. 23 to 2
5)] FIG. 23 is a diagram showing the internal structure of the γ correction table # 3 stored in the printer color correction memory 2a of the printer controller 20. As shown in FIG. 23, in the table, the γ correction value (conversion value) γ by the γ correction command
(N) (n = 0 to 255) is stored.

FIG. 24 shows a γ correction table # 4 stored in the printer color correction memory 2a of the printer controller 20.
It is a figure which shows the internal structure of. As shown in FIG. 24, the table has a γ correction value (converted value) γ (n) of γ = 1.0.
(N = 0 to 255) is stored.

FIG. 25 shows the monitor of the printer driver 13.
Complementary for each monitor stored in the color correction coefficient table storage unit 15.
It is a figure which shows the internal structure of a positive coefficient table # 2. monitor
According to the characteristics of the monitor, the different color correction coefficient table # 2
Monitor ID statement for causing the printer to perform color correction
Character string, γ correction value (converted value) γ (n) (n = 0 to 25)
5) and the input masking coefficient are stored. That te
Information of monitor ID 0 is displayed at the beginning of the bull, and monitor ID is next.
1. Monitor ID2, ..., Monitor IDn
Monitor ID character string according to model, γ correction value (converted value) γ
(N) (n = 0 to 255) and input masking coefficient
Is stored for (n + 1) models. Of these, at the top of the table
Γ correction value (converted value) γ (n) (n = 0 to 0) of monitor ID 0
255) is the correction value of γ = 1.0, the input masking coefficient
Is a0₁₁= 1, a0₁₂= 0, a0₁₃= 0, a0 _{twenty one}= 0, a0_{twenty two}=
1, a0_{twenty three}= 0, a0₃₁= 0, a0₃₂= 0, a0₃₃= 1 value, immediate
Then, a value that does not perform color correction processing is set.

The γ correction values (converted values) γ (n) (n = 0 to 255) of the remaining monitors ID1 to IDn and the input masking coefficient are set to values according to the characteristics of each monitor.
Then, in the last column of the table, a character string (“END”) indicating the end of the table is set.

[Monitor ID Pointer Address Retrieval Processing (FIG. 26)] Here, the monitor ID pointer address retrieval processing according to this embodiment will be described with reference to the flowchart shown in FIG.

After the processing of step S21, step S8
1, the monitor-specific color correction coefficient table storage unit 15 of the printer driver 13 has a monitor-specific color correction coefficient table # 2.
A pointer is set at the beginning of (FIG. 25). Then, in step S23, the monitor ID pointed to by the pointer
Character string that indicates the end of the table (“END”)
If it is determined that the pointers are returned to the head of the monitor-specific color correction coefficient table # 2 in step S85.

In this way, the address where the color correction information of the model matching the monitor ID character string of the parameter content of the received monitor information return command is stored is the monitor ID of the monitor-specific color correction coefficient table # 2. The character string is searched and stored in the monitor ID address storage unit 16.

[Γ Correction Preprocessing (FIGS. 27 to 29)] Here, the γ correction preprocessing according to this embodiment will be described with reference to the flowcharts shown in FIGS. 27 to 29.

(1) Outline of γ-correction preprocessing (FIG. 27) After the processing of steps S40 to S41, in step S92, the information of any monitor model in the monitor-specific color correction coefficient table # 2 (FIG. 25) is addressed. The γ correction value (conversion value) γ (n) (n = 0 to 255) pointed to by the extracted pointer is extracted, and in step S93, the extracted γ correction value (conversion value) γ (n) (n = 0 to 0). 255) is set in the parameter of the γ correction command (FIG. 22), and the command is issued from the printer driver 13 to the printer controller 20.

After the processing in steps S44 to S46, in step S97, the transferred γ correction value (conversion value) γ (n) (n = 0 to 255) is set in the γ correction table # 3.
(FIG. 23) is performed. Details of this storage processing will be described later with reference to FIG. Further, in step S98, the γ correction value (converted value) γ (n) of γ = 1.0
A process of storing (n = 0 to 255) in the γ correction table # 3 (FIG. 23) is performed. For more information on this storage process,
It will be described later with reference to FIG. Finally, in step S99, the pointer is set to the head address of the γ correction table # 3, and the process ends.

In this way, when the γ correction command is issued from the printer driver 13 of the host 10 to the printer controller 20, the printer controller 20 analyzes the γ correction command, and a table (γ Γ correction value (conversion value) γ in the correction table # 3)
(N) (n = 0 to 255) can be stored and accessed.

(2) γ correction value storage processing (FIG. 28) Here, the γ correction value (conversion value) transferred from the host 10 by the γ correction command executed in step S97 is set to γ.
The process of storing in the correction table # 3 will be described with reference to the flowchart shown in FIG.

First, in step S200, the pointer is set to the head of the γ correction table # 3 stored in the γ correction table storage unit 2c of the printer controller 20, and in step S201, the loop variable (n) is set to 0. .

In step S202, the parameter γ of the γ correction command (FIG. 22) analyzed in step S45 is used.
(N) is taken out and stored in the area pointed to by the pointer. In step S203, the pointer is incremented, and in step S204, 1 is added to the value of the loop variable (n).

In step S205, the value of the loop variable (n) is checked. Here, if n ≦ 255, the process returns to step S202, and if n> 255, the process ends.

In this way, the printer controller 2
The γ correction value of the parameter of the γ correction command received at 0 can be stored in the γ correction table # 3.

(3) γ Correction Value Storage Process (FIG. 29) Here, FIG. 29 shows the process of storing the γ correction value (conversion value) of γ = 1.0 executed in step S98 in the γ correction table # 3. This will be described with reference to the flowchart.

First, in step S300, γ stored in the γ correction table storage section 2c of the printer controller 20.
The pointer 1 is set to the head of the correction table # 4, and the pointer 2 is set to the head of the γ correction table # 3 stored in the γ correction table storage unit 2c of the printer controller 20 in step S301. Also, step S302
Then, the loop variable (n) is set to 0.

Next, in step S303, the γ correction value (conversion value) of γ = 1.0 in the γ correction table # 4 pointed to by pointer 1
Γ (n) is extracted, and in step S304,
The table # pointed to by pointer 2 is the extracted γ (n) #
Store in area 3. In step S305, pointer 1 and pointer 2 are incremented, and step S306
Then, 1 is added to the value of the loop variable (n).

In step S307, the value of the loop variable (n) is checked. Here, if n ≦ 255, the process returns to step S303, and if n> 255, the process ends.

In this way, the γ correction value of γ = 1.0 is set to γ
Store in correction table # 3.

[Γ Correction Processing (FIG. 30)] Here, the γ correction processing according to the present embodiment will be described with reference to the flowchart shown in FIG.

By the processing of steps S60 to S61, R
After extracting the component correction values, in step S402,
In preparation for the next process, the pointer is reset to the head of the γ correction table # 3 (FIG. 23).

Next, in step S403, step S63
After the G component correction value is extracted by the processes of to S64, in step S405, the pointer is reset to the head of the γ correction table # 3 (FIG. 23) in preparation for the next process. Finally, by the processing of steps S66 to S67, B
Extract the correction value of the component.

In this way, the RGB correction values obtained by the γ correction processing are obtained for the image data of one pixel.

Therefore, according to the present embodiment, since the γ correction value for each image data input value is supplied from the host 10 to the printer controller 20, the γ correction characteristic can be arbitrarily changed.

<Third Embodiment> In this embodiment, an example of outputting the color characteristic information of the monitor to the printer controller based on the obtained model information of the monitor and executing the color correction processing will be described.

Also in this embodiment, the same system as that used in the first embodiment is used, and the same device reference numerals are used to refer to the respective parts of the device that are common to the first embodiment. Only the characteristic parts of this embodiment will be described. Also in the flowchart described in this embodiment, the same step reference numbers are assigned to the same processing steps as those in the first embodiment, and the description thereof will be omitted. Here, only the processing steps characteristic of this embodiment will be described. To do.

[Structure Description of Color Printing System (FIGS. 31 to 32)] FIG. 31 is a block diagram showing the detailed structure of the host 10 according to this embodiment. As shown in FIG. 31, the printer driver 13 has a γ value storage unit 18 for storing γ values according to the characteristics of the monitor 50, and an input masking coefficient storage unit 19 for storing input masking coefficients. The information memory 17 is provided.

FIG. 32 is a block diagram showing a detailed structure of the monitor controller 40 according to this embodiment. As shown in FIG. 32, the monitor controller 40 includes a monitor-specific color correction coefficient table storage unit 4g that stores a monitor-specific color correction coefficient table according to the characteristics of the monitor.

[Explanation of command (FIG. 33)] Here,
A command issued by the system having the above configuration according to the present embodiment will be described with reference to FIG.

FIG. 33 is a diagram showing the structure of a monitor information return command issued by the command issuing unit 49 of the monitor controller 40. As shown in FIG. 33, the command is composed of a command number for identifying the command, a γ value, and an input masking coefficient parameter.

[Description of Table (FIG. 34)] Here,
A table used by the system having the above configuration according to the present embodiment will be described.

FIG. 34 is a view showing the structure of the monitor-specific color correction coefficient table # 1 stored in the monitor-specific color correction coefficient table storage section 44 of the monitor controller 40. FIG. 34
As shown in FIG. 5, the monitor ID-specific color correction coefficient table # 1 stores the γ value and the input masking coefficient for causing the printer to perform color correction according to the characteristics of each monitor model. In the present embodiment, the information of monitor ID0 is at the head of the table, the monitor ID1, monitor ID2,
..., up to the monitor ID n, the monitor ID character string, γ value, and input masking coefficient corresponding to the model of each monitor are (n +
1) Stored for each model.

Of these, the monitor stored at the beginning of the table
The color correction coefficient of ID 0 is also shown in FIG.
, The γ value = 1.0, and the value of the input masking coefficient is
A0 ₁₁= 1, a0₁₂= 0, a0₁₃= 0, a0_{twenty one}= 0, a0_{twenty two}=
1, a0_{twenty three}= 0, a0₃₁= 0, a0₃₂= 0, a0₃₃= 1.
In other words, color correction processing is not performed on monitor ID0.
A value that will not be set is set. In addition, the remaining monitor I
The γ values of D1 to IDn and the input masking coefficient are
Set the value according to the characteristics.

[Explanation of Color Image Output Process (FIGS. 35 to 40)] The color image output process executed by the system having the above configuration according to the present embodiment will be described below with reference to the flowchart.

(1) Outline of color image output processing (see FIG. 3)
5) FIG. 35 is a flow chart showing an outline of a process for performing color print output to a printer based on the type information of the monitor 50 connected to the monitor controller 40 in accordance with the device characteristics of the monitor.

First, in step S1, the monitor color correction information is taken out, and after the processes of steps S2 to S4 are performed, the analyzed command returns correct monitor information such as when extra parameters are added. If the command is not a command, the process proceeds to step S1006. If the analyzed command is correct, the process proceeds to step S10.
Go to 05. The details of the monitor color correction information extraction processing in step S1 will be described with reference to the flowchart shown in FIG.

In step S1005, the process of storing the received color correction information in the color correction information memory 15 is executed, and in step S1006, the process of storing the default color correction information in the color correction information memory 15 is executed. Further, details of each processing of steps S1005 and S1006 will be described with reference to the flowcharts shown in FIGS.

Finally, in step S7, color correction processing is executed and an image matching the color characteristics of the monitor is output on recording paper.

In this way, the color characteristic information of the monitor is output to the printer controller on the basis of the obtained model information of the monitor to execute the color correction processing, and an image matching the color characteristic of the monitor is recorded on the recording paper. Can be printed.

(2) Monitor Information Retrieval Processing (FIG. 36) Next, details of the monitor information retrieval processing executed in step S1 will be described with reference to the flowchart shown in FIG.

After the processing in steps S10 to S12, in step S130, the monitor-specific color correction coefficient table # stored in the monitor ID character string table storage section 44 is displayed.
Set the pointer at the beginning of 1.

In step S14, it is checked whether or not the analyzed command is correct. If the command is not a correct monitor information request command, for example, if an extra parameter is attached, the process proceeds to step S170 and the command is executed. Is a correct monitor information request command, the process proceeds to step S15.

Now, in step S15, the monitor I
After extracting the value of the D number storage unit 42, the process advances the pointer of the monitor-specific color correction coefficient table # 1 by the extracted value in step S160, and subsequently, in step S170, the γ value pointed to by the pointer. And input masking coefficient.

In step S180, step S170
The .gamma. Value and the input masking coefficient extracted in step 3 are set in the parameters of the monitor information return command shown in FIG.
Finally, in step S20, the process issues the prepared monitor information return command to the host 10 and ends the process.

In this way, the printer driver 13 of the host 10 issues a monitor information request command to the monitor controller 40, and the monitor controller 40 that has read the monitor information request command corresponds to the monitor 50 to which the monitor controller 40 is connected. The γ value and the input masking coefficient are set in the parameters of the monitor information return command, and the process of issuing to the host 10 again is executed. As a result, the printer driver 13 of the host 10 is the characteristic information γ of the monitor connected to the monitor controller 40.
You can get the value and the input masking factor.

(3) Reception Color Correction Information Storage Processing (FIG. 37) Here, details of the reception color correction information storage processing executed in step S1005 will be described with reference to the flowchart shown in FIG.

First, in step S501, the γ value is extracted from the parameters of the monitor information return command (FIG. 33) analyzed in step S3. Next, in step S502,
The extracted γ value is stored in the γ value storage unit 18 of the color correction information memory 17 of the printer driver 13. Step S50
In step 3, the input masking coefficient is extracted from the parameters of the monitor information return command (FIG. 33), and step S504.
Printer driver 1 with the input masking coefficient extracted in
3 is stored in the input masking coefficient storage unit 19 of the color correction information memory 17.

In this way, the γ value and the input masking coefficient set in the parameter of the received monitor information return command are stored in the color correction information memory 17.

(4) Default Color Correction Information Storage Processing (FIG. 38) Here, details of the default color correction information storage processing executed in step S1006 will be described with reference to the flowchart shown in FIG.

First, in step S601, γ = 1.0 is set in the γ value storage unit 18 of the color correction information memory 17, and in step S602, a ₁₁ = 1, a ₁₂ = 0, a ₁₃ = for each coefficient.
_{0, a 21 = 0, a} 22 = 1, a 23 = 0, a 31 = 0, a 32 =
The input masking coefficient having a value of 0, a ₃₃ = 1 is stored in the input masking coefficient storage unit 19 of the color correction information memory 17.

In this way, default color correction information (γ value for which color correction is not performed and input masking coefficient) is stored in the color correction information memory 17.

(5) Color-to-printer color correction processing (FIGS. 39 to 40) Further, details of the color-to-printer color correction processing executed in step S7 will be described with reference to FIGS. This will be described with reference to the flowchart shown in 40.

Outline of Color Correction Processing As described in the first embodiment, the color correction processing includes the γ correction pre-processing for the printer, the pre-input masking pre-processing for the printer, and the printer for the printer for all pixels to be processed. Although the γ correction processing and the printer input masking processing are included, the printer γ correction processing and the printer input masking processing in this embodiment are common to the processing described in the first embodiment. Now, only the pre-correction process for γ correction to the printer and the pre-process for masking input to the printer will be described.

By the color correction processing, the gamma correction processing and the input masking processing are applied to the raster image data in the RGB luminance format, and the color image is output from the printer.

.Gamma.-correction preprocessing (FIG. 39) Here, details of the .gamma.-correction preprocessing will be described with reference to the flowchart shown in FIG.

First, in step S700, the γ value is retrieved from the γ value storage section 18 of the color correction information memory 17 of the printer driver 13. From this point onward, FIG. 1 described in the first embodiment
Processing similar to steps S43 to S49 of the flowchart shown in FIG.

In this way, the printer driver 13 of the host 10 issues the γ correction command to the printer controller 20, the printer controller 20 analyzes the γ correction command, and accesses the table for changing the γ correction. Can be done.

Input Masking Preprocessing (FIG. 40) Here, the input masking preprocessing will be described with reference to the flowchart shown in FIG.

First, in step S710, the input masking coefficient is retrieved from the input masking coefficient storage unit 19 of the color correction information memory 17 of the printer driver 13. After this, the same processing as steps S53 to S58 of the flowchart shown in FIG. 17 described in the first embodiment is executed.

In this way, the printer driver 13 of the host 10 issues an input masking coefficient setting command to the printer controller 20, the printer controller 20 analyzes the input masking setting command, and stores the input masking coefficient. It is stored in the section 2b.

Therefore, according to this embodiment, the monitor color characteristic information (γ value, input masking coefficient) is output to the printer controller on the basis of the obtained monitor model information to execute the color correction processing, and the monitor is executed. An image matching the color characteristics of can be printed out.

<Fourth Embodiment> In this embodiment, the host 10 is controlled so as to supply the γ correction value corresponding to the input value of the input image data from the monitor controller 40 to the printer controller 20, and the γ correction characteristic is arbitrarily set. An example that can be changed to will be described.

Also in this embodiment, the same system as that used in the first embodiment is used, and the same device reference numerals are used for the respective parts which are common to the first embodiment. Now, only the part specific to this embodiment will be described. Also in the flowchart described in this embodiment, the same step reference numbers are assigned to the same processing steps as those in the first embodiment, and the description thereof will be omitted. Here, only the processing steps characteristic of this embodiment will be described. To do.

[Explanation of command (FIG. 41)] Here,
Commands issued by the system having the above-described configuration according to the present embodiment will be described with reference to FIG.

FIG. 41 is a diagram showing the structure of a monitor information return command issued by the command issuing unit 49 of the monitor controller 40. As shown in FIG. 41, the command is composed of a command number for identifying the command, a γ correction value (conversion value) {γ (n) (n = 0 to 255)}, and a parameter of the input masking coefficient. .

[Explanation of Various Tables (FIGS. 42 to 4)
4)] Here, various tables used by the system having the above configuration according to the present embodiment will be described.

FIG. 42 is a diagram showing the internal structure of the γ correction value temporary storage table stored in the color correction information memory 17 of the printer driver 13. This table stores the γ correction value (conversion value) {γ (n) (n = 0 to 255)} set in the monitor information return command shown in FIG. 41.

FIG. 43 shows the internal structure of the default γ correction value table stored in the color correction information memory 17 of the printer driver 13. As shown in FIG. 43,
In this table, γ correction value (converted value) of γ = 1.0 {γ
(N) (n = 0 to 255)} is stored.

FIG. 44 is a view showing the structure of the monitor-specific color correction coefficient table # 2 stored in the monitor-specific color correction coefficient table storage section 44 of the monitor controller 40. Figure 44
As shown in FIG. 4, the monitor-ID-specific color correction coefficient table # 2 has a γ correction value (converted value) {γ (n) (n
= 0 to 255)}, and the input masking coefficient is stored. In this embodiment, the monitor ID is at the beginning of the table.
0 information, then monitor ID 1, monitor ID 2, ...
D character string, γ correction value (converted value) {γ (n) (n = 0 to 2
55)}, and input masking coefficients for (n + 1) model types are stored.

Of these, the γ correction value (conversion value) {γ (n) (n = 0 to 2) of the monitor ID 0 stored at the head of the table
55)}, as shown in FIG. 44, the correction value of γ = 1.0 and the value of the input masking coefficient are a0 ₁₁ = 1 and a0, respectively.
₁₂ = 0, a0 ₁₃ = 0, a0 ₂₁ = 0, a0 ₂₂ = 1, a0 ₂₃ = 0, a0
_{It is} assumed that ₃₁ = 0, a0 ₃₂ = 0, a0 ₃₃ = 1. In other words, the monitor ID 0 is set to a value such that color correction processing is not performed. In addition, γ of the remaining monitor ID1 to IDn
The correction value (converted value) {γ (n) (n = 0 to 255)} and the input masking coefficient are set to values according to the characteristics of each monitor.

[Explanation of Color Image Output Process (FIGS. 45 to 48)] The color image output process executed by the system having the above-described configuration according to the present embodiment will be described below with reference to the flowcharts.

By this processing, the information of the color characteristics of the monitor is output to the printer controller on the basis of the obtained model information of the monitor to execute the color correction processing, and the image matching the color characteristics of the monitor is printed on the recording paper. To do.

(1) Monitor Information Retrieval Processing (FIG. 45) Next, details of the monitor information retrieval processing executed in step S1 will be described with reference to the flowchart shown in FIG.

After the processing of steps S10 to S12, in step S131, the monitor-specific color correction coefficient table # stored in the monitor ID character string table storage unit #
Set the pointer at the beginning of 2.

In step S14, it is checked whether or not the analyzed command is correct. If the command is not a correct monitor information request command, for example, if an extra parameter is attached, the process proceeds to step S171 and the command is executed. Is a correct monitor information request command, the process proceeds to step S15.

Now, step S15 and step S16
After the processing of 0, subsequently in step S171, the γ correction value (conversion value) pointed to by the pointer {γ (n) (n = 0 to 2
55)} and the input masking coefficient. Step S
In 181, the extracted γ correction value (converted value) {γ
(N) (n = 0 to 255)} and the input masking coefficient are set as the parameters of the monitor information return command shown in FIG. Finally, in step S20, the process issues the prepared monitor information return command to the host 10 and ends the process.

In this way, the printer driver 13 of the host 10 issues a monitor information request command to the monitor controller 40, and the monitor controller 40 that has read the monitor information request command corresponds to the monitor 50 to which the monitor controller 40 is connected. γ correction value (converted value) {γ (n)
(N = 0 to 255)} and the input masking coefficient are set in the parameters of the monitor information return command, and the process of issuing to the host 10 again is executed. By this, the printer driver 13 of the host 10 obtains the γ correction value (conversion value) {γ (n) (n = 0 to 255)} and the input masking coefficient which are the characteristic information of the monitor connected to the monitor controller 40. You can

(2) Reception Color Correction Information Storage Processing (FIG. 46) Here, details of the reception color correction information storage processing according to the present embodiment will be described with reference to the flowchart shown in FIG.

First, in step S800, the pointer is set to the head of the γ correction value temporary storage table stored in the color correction information memory 17 of the printer driver 13, and in step S801, the loop variable (n) is set to 0. .

In step S802, the γ correction value (converted value) {γ (n) (n = 0 to 255)} from the parameters of the monitor information return command (FIG. 41) analyzed in step S3.
Is extracted and stored in the area pointed to by the pointer. In step S803, the pointer is incremented, and in step S804, 1 is added to the value of the loop variable (n). In step S805, the value of the loop variable (n) is checked. Here, if n ≦ 255, the process returns to step S802, and if n> 255, the process proceeds to step S806.

In step S806, the input masking coefficient is extracted from the parameters of the monitor information return command (FIG. 41) analyzed in step S3. Next, step S
At 807, the extracted input masking coefficient is stored in the input masking coefficient storage unit 19 of the color correction information memory 17 of the printer driver 13.

In this way, the γ correction value (conversion value) {γ (n) (n = 0 to 25) which is the color correction information set in the parameter of the received monitor information return command.
5)} and the input masking coefficient are stored in the color correction information memory 17.

(3) Default Color Correction Information Storage Processing (FIG. 47) Here, details of the default color correction information storage processing according to this embodiment will be described with reference to the flowchart shown in FIG.

First, in step S900, the pointer 1 is set at the head of the default γ correction value table stored in the color correction information memory 17 of the printer driver 13, and in step S901 the color correction information memory 17 of the printer driver 13 is stored. The pointer 2 is set at the head of the γ correction value temporary storage table. In step S902, the loop variable (n) is set to 0.

Next, in step S903, γ (n) of the γ correction value (conversion value) in the default γ correction value table pointed to by pointer 1 is extracted, and in step S904, the extracted γ (n) is stored in pointer 2. It is stored in the area of the γ correction value temporary storage table. In step S905,
The pointer 1 and the pointer 2 are incremented, and 1 is added to the value of the loop variable (n) in step S906.

At step S907, the loop variable (n)
Check the value. Here, if n ≦ 255, the process proceeds
Return to step S903, and if n> 255, the process is step
Proceed to S908. In step S908, the input maskin
A for each coefficient₁₁= 1, a₁₂= 0, a₁₃= 0, a_{twenty one}
= 0, a_{twenty two}= 1, a_{twenty three}= 0, a₃₁= 0, a₃₂= 0, a ₃₃
= 1 is set and the input map of the color correction information memory 17 is set.
It is stored in the scaling coefficient storage unit 19.

In this way, the default color correction information is stored in the color correction information memory 17.

(4) Color-to-printer correction processing (FIG. 48) Here, the details of the color-to-printer correction processing executed in step S7 will be described with reference to the γ-correction preprocessing which is a processing peculiar to this embodiment. This will be described with reference to the flowchart shown in FIG. By this color correction processing, RG
The .gamma. Correction process and the input masking process are applied to the raster image data of the B brightness format, and the color image is output from the printer.

.Γ Correction Preprocessing (FIG. 48) Here, details of the γ correction preprocessing will be described with reference to the flowchart shown in FIG.

First, in step S720, a pointer is set in the γ correction value temporary storage table of the color correction information memory 17 of the printer driver 13. After this, step S9 of the flowchart shown in FIG. 27 described in the second embodiment.
2 to S99 are executed.

In this way, the printer driver 13 of the host 10 issues the γ correction command to the printer controller 20, the printer controller 20 analyzes the γ correction command, and the γ correction command is set in the table for changing the γ correction.
A correction value (converted value) {γ (n) (n = 0 to 255)} can be stored and accessed.

Therefore, according to this embodiment, the host 10 controls the monitor controller 40 to supply the γ correction value corresponding to the input value of the input image data to the printer controller 20 based on the model information of the monitor, It is possible to change the γ correction characteristic and execute the color correction processing by the printer controller 20, and print out an image that matches the color characteristic of the monitor.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0192]

As described above, according to the present invention, the type of display means to be connected is set, the display characteristic information is searched from the set type, and the color image data is obtained based on the display characteristic information. Since the color correction is applied to the print means and the result is output to the print means, the display characteristics of the display means can be dynamically reflected in the color image output to the print means, and an easy color adjustment operation can be performed. . This facilitates color matching of the color images output to the display unit and the printing unit.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a color printing system that is a typical embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a host computer 10 according to the first embodiment.

FIG. 3 is a block diagram showing a configuration of a printer controller 20 according to the first embodiment.

FIG. 4 is a block diagram showing a configuration of a monitor controller 40 according to the first embodiment.

FIG. 5 is a diagram showing formats of various commands used in the first embodiment.

FIG. 6 is a diagram showing an internal structure of a monitor ID character string table.

FIG. 7 is a diagram showing an internal structure of a monitor-specific color correction coefficient table # 1.

FIG. 8 is a diagram showing an internal structure of a γ correction table # 1.

FIG. 9 is a diagram showing an internal structure of a γ correction table # 2.

FIG. 10 is a diagram showing correspondence between monitor models and ID numbers.

FIG. 11 is a diagram showing a correspondence relationship between on / off combinations of dip switches and values input by the combinations.

FIG. 12 is a flowchart showing an outline of color printer output processing according to the monitor characteristics according to the first embodiment.

FIG. 13 is a flowchart showing monitor information extraction processing according to the first embodiment.

FIG. 14 is a flowchart showing a monitor ID pointer address search process according to the first embodiment.

FIG. 15 is a flowchart showing a printer color correction process according to the first embodiment.

FIG. 16 is a flowchart showing printer pre-gamma correction preprocessing according to the first embodiment.

FIG. 17 is a flowchart showing pre-masking processing for printer input masking according to the first embodiment.

FIG. 18 is a flowchart showing printer-to-printer gamma correction processing according to the first embodiment.

FIG. 19 is a flowchart showing an input masking process for printer according to the first embodiment.

FIG. 20 is a diagram showing an example of obtaining a monitor ID from a signal output from a color monitor.

21 is a diagram showing an example in which a monitor ID is obtained by input from the operation panel 4f of the monitor controller 40. FIG.

FIG. 22 is a diagram showing a format of a command used in the second embodiment.

FIG. 23 is a diagram showing an internal structure of a γ correction table # 3.

FIG. 24 is a diagram showing an internal structure of a γ correction table # 4.

FIG. 25 is a diagram showing an internal structure of a monitor-specific color correction coefficient table # 2.

FIG. 26 is a flowchart showing a monitor ID pointer address search process according to the second embodiment.

FIG. 27 is a flowchart showing pre-printer gamma correction preprocessing according to the second embodiment.

FIG. 28 is a flowchart showing a transfer γ correction value storage process according to the second embodiment.

FIG. 29 is a flowchart showing a correction value storage process for γ = 1.0 according to the second embodiment.

FIG. 30 is a flowchart showing printer-to-printer gamma correction processing according to the second embodiment.

FIG. 31 is a block diagram showing the configuration of a host computer 10 according to the third embodiment.

FIG. 32 is a block diagram showing a configuration of a monitor controller 40 according to the third embodiment.

FIG. 33 is a diagram showing a format of a monitor information return command according to the third embodiment.

FIG. 34 is a diagram showing an internal structure of a monitor-specific color correction coefficient table # 1 according to the third embodiment.

FIG. 35 is a flowchart showing an outline of color printer output processing according to the monitor characteristics according to the third embodiment.

FIG. 36 is a flowchart showing monitor information extraction processing according to the third embodiment.

FIG. 37 is a flowchart showing a reception color correction information storage process according to the third embodiment.

FIG. 38 is a flowchart showing a default color correction information storage process according to the third embodiment.

FIG. 39 is a flowchart showing pre-printer gamma correction preprocessing according to the third embodiment.

FIG. 40 is a flowchart showing pre-input masking pre-processing for printer according to the third embodiment.

FIG. 41 is a diagram showing a format of a monitor information return command according to the fourth embodiment.

FIG. 42 is a diagram showing an internal structure of a γ correction value temporary storage table according to the fourth embodiment.

FIG. 43 is a diagram showing an internal structure of a default γ correction value table according to the fourth embodiment.

FIG. 44 is a diagram showing an internal structure of a printer-specific color correction coefficient table # 2 according to the fourth embodiment.

FIG. 45 is a flowchart showing monitor information extraction processing according to the fourth embodiment.

FIG. 46 is a flowchart showing a reception color correction information storage process according to the fourth embodiment.

FIG. 47 is a flowchart showing a default color correction information storage process according to the fourth example.

FIG. 48 is a flowchart showing pre-printer gamma correction preprocessing according to the fourth embodiment.

[Fig. 49] Fig. 49 is a diagram conceptually illustrating a process of performing a color reproduction process by subjecting an original input image to a γ correction process and an input masking process.

FIG. 50 is a diagram showing characteristics of γ correction.

[Explanation of symbols]

10 Host Computer 13 Printer Driver 14 Command Analysis Unit 20 Printer Controller 21 Printer Engine Interface (P Interface) 26 Host Interface (H Interface) 30 Printer Engine 40 Monitor Controller 41 Color Monitor Interface (M Interface) 43 Dip Switch 47 Host Interface (H Interface) 50 color monitor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication 8420-5L G06F 15/66 310 4226-5C H04N 1/46

Claims (9)

[Claims] 1. A color image processing method for processing a color image and outputting the color image to a display device and a printing device, comprising a storage step of storing display characteristic information of a connectable display device, and a color image display method. A setting step of setting the type of display device to be connected, a step of extracting display characteristic information of the display device based on the set type, and a color for performing color correction on the color image data based on the display characteristic information. A color image processing method comprising: a correction step; and an output step of outputting the color-corrected color image data to a printing device. 2. A color image processing apparatus for processing a color image and outputting the color image to a display means and a printing means, the storage means storing display characteristic information of a connectable display means, and a color image display apparatus for displaying the color image. Setting means for setting the type of display means to be connected, search means for taking out display characteristic information of the display means from the storage means based on the set type, and color information for color image data based on the display characteristic information. A color image processing apparatus comprising: a color correction unit that performs correction; and an output unit that outputs the color-corrected color image data to a printing unit. 3. The color image processing apparatus according to claim 2, wherein the display unit is a color display device, and the printing unit is a color printer device. 4. The color image processing apparatus according to claim 2, wherein the display characteristic information includes a gamma (γ) value for gamma correction and an input masking coefficient for input masking. 5. The color image processing apparatus according to claim 2, wherein the setting unit is a DIP switch. 6. The color image processing apparatus according to claim 2, wherein the setting unit is an operation panel having an LCD and an input key. 7. The color image processing apparatus according to claim 2, wherein the color correction includes gamma correction and input masking processing applied to all pixels of input color image data. 8. The input color image data is RG.
The color image processing apparatus according to claim 7, wherein the color expression is performed with the B component. 9. The display means has a transmission means for transmitting a signal indicating the type of the display means to the setting means, and the setting means has a reception means for receiving the signal indicating the transmitted type. The color image processing device according to claim 2.