JP2002149149A - Color proofing method and device - Google Patents

Abstract

(57) [Problem] To provide a color proofing method and apparatus capable of obtaining color matching of a color image displayed on a monitor window with an sRGB color image without imposing a burden on a user. An apparatus for calibrating a color of a color image displayed on a window of an RGB input monitor is provided.
The RGB signal is converted to a color signal of a predetermined color value using the CC profile, the color signal is converted to an sRGB color signal using an ICC profile suitable for the monitor currently used, and the signal is converted to a window. An image signal for displaying an image in sRGB color is displayed on the monitor via a GUI.
An image can be displayed in sRGB color on the window using the RGB color image signal. Further, it is also possible to make the window larger than the display image and display the reference white (D65) of the sRGB standard monitor in the area between the display image and the window frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a color proofing method and apparatus. In particular, the present invention relates to a method and apparatus capable of displaying an image as if viewed on an sRGB standard monitor (IEC-61966-2.1) in a window on a screen.

[0002]

2. Description of the Related Art With the recent spread of personal computers, digital still cameras, and the like, and the development of infrastructure by Internet service providers and the like, the chance of handling color images on personal computers is increasing rapidly even in ordinary households. For example,
2. Description of the Related Art Color digital images taken by a digital still camera are taken into a computer, displayed on a display, output to a color printer, or posted on a user's homepage.

As described above, when an image is input / output by a plurality of image processing apparatuses, it is necessary to obtain color matching in order to appropriately reproduce the colors and the like of the input image. Currently, ICC (Internati) which describes the color reproduction characteristics of each image device is used as a color matching method.
onal Color Consortium) profile (see Fig. 1) and the international standard IEC-61966-2.1sRGB (Standard RGB) color spa
There is a color matching (see FIG. 2) method using ce (hereinafter, referred to as sRGB color space).

[0004] The sRGB color space is also adopted as the default color space of the Windows OS, and color matching can be achieved by making each color image device compatible with this color space. Therefore, although there is a burden on the imaging equipment manufacturer, the method using the sRGB color space is simpler from the user side than the method using the ICC profile.

[0005] When the processing for obtaining color matching between the monitor used by the user and another color image device is performed by using the former method, the CMS at the OS level is performed.
(Color Management System) and an ICC profile can be used to obtain color matching of an image displayed in an application window. In this case, the user has to set in advance an ICC profile (hereinafter referred to as a monitor ICC profile to be used) that describes the target image device for which color matching is desired and the color characteristics of the monitor displaying the image. . for that reason,
If the user does not have some knowledge of the CMS, there is a risk of confusion that the color of the currently displayed image cannot be understood.

Some color image editing applications on the market actually have an sRGB ICC profile set by default when the application is installed. The color image displayed by the application is displayed in the sRGB color space without the user's awareness. Therefore, the user needs to pay attention to the color of the image being displayed. FIG. 3 shows an example of sRGB color conversion using an ICC profile.

In the latter method, a color matching method using an sRGB color space, the color of an image displayed or output in each color image device is controlled by an sRGB standard monitor under an sRGB standard viewing environment (see Table 1). The color observed above (sR
(GB color). For example, in the case of a display, the color displayed on the screen must be sRGB color,
In the recent market, personal computer displays (sometimes made by Sony) that are called "sRGB compatible" have begun to be distributed.

[Table 1]

[0008] These "sRGB compatible displays" are "sRGB modes" provided in hardware on display devices.
When the user selects the button, the display characteristics (white point chromaticity, gradation characteristics, etc.) of the display become characteristics close to those of the sRGB standard monitor. With these settings, all the images displayed on the screen are displayed as if they were viewed on an sRGB standard monitor (white point chromaticity is D65 and white point luminance is 80 [cd / m ² ]). On the other hand, most commercially available CRT monitors have a white point color temperature of D93 or higher, which is the default setting, at the request of the market (excluding the European region). The white point brightness is also high.

[0009]

However, in the method of obtaining color matching using an ICC profile, a user must set in advance an ICC profile that describes the color characteristics of both image devices for which color matching is desired. Users, so users have some
Without the knowledge of CMS, there is a problem that it becomes difficult to know the characteristics of the color of the currently displayed image.

In the method of obtaining color matching using the sRGB color space, the user can obtain color matching with other color image devices by setting the "sRGB mode" button or the like. SRGB standard monitor image display on the entire screen as well as the desired image
If the user wants to view an image other than the part desired to be displayed in the color of the GB color space, the user must return the mode of the monitor to the characteristics (for example, high color temperature and high brightness) used previously. There's a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to convert a color image displayed on a monitor window into an sRGB color image without burdening a user. The object of the present invention is to provide a color proofing method and device capable of obtaining matching.

[0012]

In order to achieve the above object, the present invention provides an apparatus for calibrating the color of a color image displayed on a window of a display device to which an RGB signal is input. The RGB signal is converted into a color signal of a predetermined color value using
Color conversion means for converting the color signal into an sRGB color signal using an ICC profile, and having the sRGB color signal as an image signal for displaying an image in sRGB color on a window of the display device, The display device includes the sR
It is configured to display an image in sRGB color on the window using a GB color image signal. Hereinafter, this is referred to as a first invention.

According to another aspect of the present invention, there is provided an apparatus for performing color calibration of a color of a color image displayed on a window of a display device which receives an RGB signal as an input. The color signals are converted to sRGB color signals using monitor color control data including white point chromaticity data, RGB chromaticity data, and monitor gradation characteristic data (RGB gamma value) of the display device. Has a color conversion means for converting the sRGB color signal into an image signal for displaying an image in sRGB color on a window of the display device, and the display device uses the sRGB color image signal. The window is configured to display an image in sRGB color. Hereinafter, this is referred to as a second invention.

According to another aspect of the present invention, in the first or second aspect, the apparatus for color-correcting a color of a color image displayed in a window of the display device uses a GUI for inputting from the window. And a profile selection unit that instructs conversion by the color conversion unit, wherein the color conversion unit converts the input RGB signal into the sRGB color image signal in accordance with an instruction input from the profile selection unit. It is configured to convert to Hereinafter, this is referred to as a third invention.

According to another aspect of the present invention, in any one of the first to third aspects, the apparatus for color-correcting the color of a color image displayed in a window of the display device includes a frame for a window for displaying the image. White frame creating means for generating white frame data for displaying a reference white (D65) of an sRGB standard monitor in an area between the display image and the window frame, which is larger than the display image, The display device uses the white frame data to display a reference white (D6) of an sRGB standard monitor in an area between the display image and the window frame.
5) is configured to display. Hereinafter, this is referred to as a fourth invention.

According to another aspect of the present invention, in the fourth aspect, the profile selecting means uses the GUI,
Means for specifying a reference white signal level of the sRGB standard monitor, wherein the display device is configured to display the reference white of the sRGB standard monitor at the specified signal level.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 4 is a diagram illustrating an overall configuration of a color proofing device 400 according to one embodiment of the present invention. When the user instructs the color proofing device 400 of FIG. 4 to convert to sRGB color, the image converted to sRGB color is output on the monitor. In FIG. 4, the color proofing device 4
00 is the image display application unit 410 and the OS system unit 42
It is roughly classified into 0. The image display application unit 410 includes a profile selection unit 411, an ICC profile reading unit 41
2. It comprises a color conversion unit A413, a white frame creation unit 414, and an image display unit 415. The OS system section 420 includes a monitor information file, sRGB ICC
Predetermined data including profile data and usage monitor ICC profile data is stored.

The operation of each of the above components will be described below. In the following description, a general RGB
It is assumed that an image signal is input, and an sRGB color image is displayed in a window for the image on a general monitor in the same manner as when the image signal is converted and viewed on an sRGB standard monitor.

Using the GUI, the profile selection unit 411 waits for a window displaying a color image to be clicked with a mouse or the like and a menu for conversion to "sRGB color" to be selected (see FIG. 5). . Note that the selection of the conversion menu may be performed using a keyboard or other devices. When the conversion to sRGB is selected, the profile selection unit 411 reads the monitor information file from the OS system unit 420, and selects the monitor ICC profile to be used based on the information of this file. Then, the information is output to ICC profile reading section 412. Also, when a display level of a reference white color of a white frame described later is designated using the above GUI (see FIG. 6),
Output to the image display unit 415.

The ICC profile reading unit 412 receives information on the use monitor ICC profile from the profile selection unit 411. In response to a request from the color conversion unit A 413, the ICC profile reading unit 412 reads one or both of the data of the use monitor ICC profile and the data of the sRGB ICC profile into the OS system unit 4.
20 and output to the color conversion unit A413.

The color conversion unit A413 converts the image RGB of the display image
The data is output to the white frame creation unit 414. Next, the color conversion unit A413 converts the RGB digital signal values of the display image into CIE / XYZ tristimulus values using the received sRGB ICC profile data. Here, the color space of the converted color values is not limited to the CIE / XYZ space, and may be the color values of the CIE / L * a * b * space or the color values of other spaces. Then, using the data of the used monitor ICC profile, the converted CIE / XYZ tristimulus values are converted into RGB ′ digital signal values and output to the image display unit 415. This conversion to the RGB ′ digital signal value is a conversion for displaying the same color as the sRGB standard monitor.

The white frame creation unit 414 sets the window size to be larger than the display image size based on the RGB data from the color conversion unit A413. The size of the window can be set, for example, to a size around 5 mm to 15 mm around the display image. The method for increasing the window size may be based on information stored in advance or based on a user's instruction.
The size after the enlargement may be another size.
Next, white frame data, which is data including information on the enlarged window, is output to the image display unit 415.

The image display unit 415 uses the converted RGB digital signal (hereinafter, referred to as an sRGB color signal) received from the color conversion unit A 413 and the enlarged window information received from the white frame creation unit 414. An image formed based on the sRGB color signal is displayed at the center of the enlarged window. Around the displayed image and in the window, for example, the reference white (D6
5) is displayed (see FIG. 6).

The signal level of the reference white (D65) around the display image may be set to an input signal level of 100% by default. In this case, when the user wants to change the white display level, the white display level may be changed from a GUI (see FIG. 6) provided with at least the following three level selections. . (1) 100% white (If the input signal is 8 bits, R, G, B are all 2
(2) 20% Gray (If the input signal is 8 bits, all R, G, B
128 digital values) (3) Black (RGB input signal values are all 0 digital values)

The processing flow in the color proofing method according to the first embodiment will be described below. FIG. 7 is a flowchart showing a flow of processing in the color proofing method according to Embodiment 1 of the present invention. In step S710, the profile selection unit 411 clicks the window displaying the color image with a mouse or the like, and outputs “sRGB color”
Wait for the conversion menu to be selected (see FIG. 5). Note that the selection of the conversion menu may be performed using a keyboard or other devices. Then, when the display level of the reference white of the white frame displayed around the display image is designated (see FIG. 6), the profile selection unit 411 outputs it to the image display unit 415.

In step S720, white frame creating section 414
Sets the window size larger than the display image size based on the RGB data from the color conversion unit A413. The size of the window is, for example, 5 mm to 1
The size can be made to have an area of about 5 mm. The method for expanding the window size may be based on information stored in advance or based on a user's instruction. Further, the size to be enlarged may be another size.

In step S730, the ICC profile reading unit 412 sends the data of the sRGB ICC profile to the OS system unit 4 in response to a request from the color conversion unit A413.
20 and output to the color conversion unit A413. In step S740, the color conversion unit A413 sets the received sRGB
The RGB digital signal values of the display image are converted into CIE / XYZ tristimulus values using the data of the ICC profile. here,
The color space of the converted color values is not limited to the CIE / XYZ space, and may be a color value in the CIE / L * a * b * space or a color value in another space.

In step S750, the profile selection unit 411 stores the monitor information file in the O
The monitor ICC profile is read from the S system section 420, and a use monitor ICC profile is selected based on the information of this file. Then, the information is output to ICC profile reading section 412. In step S760, in response to a request from the color conversion unit A413, the ICC profile reading unit 412 reads the data of the used monitor ICC profile from the OS system unit 420 and outputs the data to the color conversion unit A413.

In step S770, the color conversion unit A413
Converts the converted CIE / XYZ tristimulus values into RGB 'digital signal values using the data of the used monitor ICC profile. The conversion to RGB 'digital signal value is sR
This is a conversion to display the same color as the GB standard monitor.

In step S780, the image display unit 415
Using the sRGB color signal received from the color conversion unit A 413 and the white frame data (data including information on the enlarged window) received from the white frame creation unit 414,
An image generated from the sRGB color signal is displayed in the center of the enlarged window. In step S790, the image display unit 415 displays, for example, the reference white (D65) of the sRGB standard monitor around the displayed image and in the window (see FIG. 6). Note that the display level of the reference white can be the display level input via the profile selection unit 411. The process ends here.

As described above, according to the first embodiment, in order to obtain color matching between a color image displayed on a monitor and an image displayed on another color image device, a user needs to: By simply selecting "sRGB conversion" by GUI, without initial setting such as ICC profile setting,
A color proofing method and apparatus capable of easily obtaining color matching in sRGB color can be realized.

Further, without changing the settings such as the monitor luminance and the white point color temperature setting, the image which the user wants to obtain color matching is displayed while maintaining the monitor use conditions which the user has used so far. Color matching can be obtained only for windows.

Further, even when the color temperature of the white point of the monitor used by the user is greatly different from the reference white color D65 of the sRGB standard monitor, the white portion of D65 is placed around the image converted to the sRGB color. With this arrangement, it is possible to reduce the influence of the color outside the window in which the sRGB color is displayed, and it is possible to obtain more accurate color matching.

Embodiment 2 In the color proofing method and apparatus according to the first embodiment, the monitor information file and the data of the monitor ICC profile to be used are stored in the OS system section 420 and used based on the information in the monitor information file. It is assumed that the data of the monitor ICC profile can be found. However, there are monitors such as the Windows plug and play monitor that do not have such a premise, and the color proofing method and apparatus according to the first embodiment require such a monitor.
No color matching can be obtained for sRGB colors. In the second embodiment, a color proofing method and apparatus capable of obtaining sRGB color matching even in an image display device in which the above assumption is not satisfied will be described.

FIG. 8 is a diagram showing the overall configuration of a color proofing device 400 according to the second embodiment. The configuration is such that, of the components shown in the first embodiment, the color conversion unit A413 is replaced with a color conversion unit B417, and the monitor characteristic reading unit 4
16 has been added. In the second embodiment, the ROM in the monitor of the monitor used for the color proofing device 400 is used.
430 is connected. In the following description, the same components as those shown in FIG. 4 in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Also,
The monitor ROM 430 stores data such as white point chromaticity, RGB chromaticity, and monitor gradation characteristic data (RGB gamma value) of the monitor being used (VESA (Video Electronics Standards A).
(ssociation) standard EDID (Extended Display Identific)
ation Data) is stored.

In the second embodiment, the profile selection unit 411 uses a GUI to click a window displaying a color image with a mouse or the like, and then displays “sRGB”.
Wait for the conversion menu to "color" to be selected (Fig. 5
See). When the conversion to sRGB is selected, the profile selection unit 411 determines whether the monitor information file has been found in the OS system unit 420. If it is determined that the data has been found, the data of the used monitor ICC profile is stored in the OS system section 4 based on the information in the monitor information file.
20 is determined. Then, these determination results are output to the ICC profile reading unit 412 and the monitor characteristic reading unit 417. The second embodiment is intended for the case where the data of the used monitor ICC profile cannot be used finally. The operation and processing when the data of the used monitor ICC profile can be used are described in the above embodiment. This is the same as in the first embodiment, and will not be described below. Also, the profile selection unit 41
1 outputs to the image display unit 415 when the display level of the reference white of the white frame shown in the first embodiment is designated using the GUI.

The monitor characteristic reading section 416 receives data such as white point chromaticity, RGB chromaticity, monitor gradation characteristic data (RGB gamma value) of the monitor in use in response to a request from the color conversion section B 417. (Data such as EDID) in monitor ROM4
30 and output to the color conversion unit B417.

The color conversion unit B 417 converts the image RGB of the display image
The data is output to the white frame creation unit 414. Next, using the data of the sRGB ICC profile received via the ICC profile reading unit 412, the RGB digital signal value of the display image is converted into a CIE / XYZ tristimulus value or the like. The color conversion unit B 417 uses the white point chromaticity and the RGB chromaticity data received from the monitor characteristic reading unit 416 to convert the XYZ tristimulus values into linear RGB digital signal values. Is calculated. Further, the color conversion unit B417
Converts the XYZ tristimulus values into linear RGB digital signal values using a 3 * 3 conversion matrix. Thereafter, the color conversion unit B 417 generates an inverse gradation characteristic curve obtained by inversely converting the gradation characteristic curve received via the monitor characteristic reading unit 416, and uses the inverse gradation characteristic curve to convert the linear RGB digital signal value into RGB. 'Convert to digital signal values (see FIG. 9). Hereinafter, the converted signal is referred to as an sRGB color image signal. The above-described method of calculating the 3 * 3 conversion matrix includes, for example, the following method.

The monitor of Red, Green, Blue, xy chromaticity values of _{White (x R, y R)} , (x G, y G), (x B, y B), (x w, y w)
Thus, a 3 * 3 additive color mixture matrix (theoretical value) shown in the following equation (1) can be calculated. Since the 3 * 3 conversion matrix can be calculated as the inverse matrix of the 3 * 3 additive color mixture matrix (theoretical value), if the calculation method of the 3 * 3 additive color mixture matrix (theoretical value) becomes clear, the 3 * 3 conversion The method of calculating the matrix is also clear. Below, 3 *
The calculation method of the 3 additive color mixture matrix (theoretical value) will be described.

(Equation 1) In the formula (1), R ′, G ′, B ′ take a value of 0 to 1,
They use the gradation correction (γ
Corrected value).

The above formula (1) is a constant m _r, m _g, with m _b, it can be rewritten as the following equation (2).

(Equation 2) _{Here, (x R, y R)} , (x G, y G), (x B, y B), (x w,
y _w ) has the relationship shown in the following equation (3).

(Equation 3) Equation (2) is a constant m _r, m _g, if m _b is obtained, 3 * 3 additive color mixing matrix (theoretical value) indicating that can be calculated.

When all the input digital values of R ', G', and B 'are maximum (255, 255, 255), that is, (R', G ',
When B ′) = (1, 1, 1), the tristimulus value of the reference white displayed on the monitor is assumed to be (X ′ _w , 1, Z ′ _w ). The tristimulus values (X ′ _w , 1, Z ′ _w ) are the white tristimulus values (X _w , Y _w ,
Z _w ) is a value normalized by Y _w , and is expressed as shown in the following equation (4).

(Equation 4) Here, X ′ _w and Z ′ _w are shown in the following equation (5).

(Equation 5)

Thus, equation (4) is expressed as equation (6) below.

(Equation 6) Further, equation (6) is expressed as equation (7) below.

(Equation 7)

When the equation (7) is expressed in a matrix format, it is expressed as the following equation (8).

(Equation 8) Thus, the constant m _r, m _g, m _b can be obtained as the following equation (9).

(Equation 9)

Actually, as shown in Table 1, R, G, B, Whit
Let's find the 3 * 3 additive color mixture matrix (theoretical value) for the monitor of the xy chromaticity value of e.

[Table 2] By substituting the x, y, and z values of R, G, B, and White in Table 1 into the above equation (9), the constants _mr , _mg , and _mb are obtained as shown in the following equation (10). .

(Equation 10)

These constants _mr , _mg , _mb and R, G, B,
From the x, y, and z values, a 3 * 3 additive color mixture matrix can be calculated as shown in the following equation (11).

[Equation 11] The transformation matrix is obtained by taking the inverse of the 3 * 3 additive color mixture matrix.

The processing flow in the color proofing method according to the second embodiment will be described below. FIG. 10 is a flowchart showing the flow of processing in the color proofing method according to Embodiment 2 of the present invention. In the following description, the first embodiment
7, the same processes as those shown in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted.

After converting the RGB digital signal values of the display image into CIE / XYZ tristimulus values or the like in steps S710 to S740, in step S1041, the profile selection unit 411 determines whether the monitor information file is in the OS system unit 420. To determine if it is found within. If it is determined that the monitor information file has been found, the process proceeds to step S1042. If it is determined that the monitor information file has not been found, the process jumps to step S1043.

In step S1042, the profile selection unit 411 determines whether data of the used monitor ICC profile exists in the OS system unit 420 based on the information of the monitor information file. If it is determined that the data of the used monitor ICC profile has been found, the process proceeds to step S750, and in the subsequent steps, the same process as the process described in the first embodiment is performed. If it is determined that the data of the used monitor ICC profile has not been found, the process proceeds to step S10.
Proceed to 43.

In step S1043, the monitor characteristic reading unit 416 responds to a request from the color conversion unit B417.
Monitor white point chromaticity, RGB chromaticity, and monitor gradation characteristic data (RGB gamma value) used from the monitor ROM 430
And other data (data such as EDID) are read and the color conversion unit B
417. In step S1044, the color conversion unit B
A 417 calculates a 3 * 3 conversion matrix for converting the XYZ tristimulus values into linear RGB digital signal values using the received white point chromaticity and RGB chromaticity data.

In step S1045, the color conversion unit B417
Converts the XYZ tristimulus values into linear RGB digital signal values using the above 3 * 3 conversion matrix. Step S
At 1046, an inverse gradation characteristic curve is generated by inversely transforming the gradation characteristic curve received via the monitor characteristic reading unit 416, and the linear RGB digital signal value is converted to the RGB ′ digital signal value using the inverse gradation characteristic curve. Conversion (see FIG. 9). In steps subsequent to step S1046, the processing for display described in the first embodiment is performed, and the processing ends.

As described above, according to the second embodiment, since the processing for converting the CIE / XYZ tristimulus values into the sRGB color image signal using the data such as the EDID of the ROM in the monitor is used, Even on monitors that do not have monitor ICC profile data, the user can use the GUI to perform "sRGB conversion".
The color proofing method and apparatus can easily achieve color matching in the sRGB color only by selecting.

[0052]

As described above, according to the present invention,
To obtain color matching between the color image displayed on the monitor and the image displayed on other color image equipment, the user simply selects "sRGB conversion" using the GUI and performs initial settings such as ICC profile settings. SR easily without having to do
A color proofing method and apparatus capable of obtaining color matching in GB colors can be realized.

Further, according to the present invention, it is desired to carry out the color matching while maintaining the use conditions of the monitor which the user has used so far without changing the settings such as the luminance of the monitor and the color temperature setting of the white point. Color matching can be obtained only for the window where the image is displayed.

Further, according to the present invention, even when the color temperature of the white point of the monitor used by the user is significantly different from the reference white D65 of the sRGB standard monitor, the color temperature around the image converted to the sRGB color can be improved. By providing the white portion of D65, the influence of the color outside the window in which the sRGB color is displayed can be reduced, and more accurate color matching can be obtained.

According to the present invention, the EDI of the ROM in the monitor
In order to perform the process of converting CIE / XYZ tristimulus values to sRGB color image signals using data such as D, even on a monitor that does not have the data of the monitor ICC profile used, the user can use the GUI to perform sRGB conversion. A color proofing method and apparatus can easily realize color matching in sRGB color simply by making a selection.

[Brief description of the drawings]

FIG. 1 is a diagram for conceptually explaining a method of obtaining color matching using an ICC profile.

FIG. 2 is a diagram for conceptually explaining a method of obtaining color matching using sRGB values.

FIG. 3 is a diagram for conceptually explaining color conversion to sRGB color using an ICC profile.

FIG. 4 is a color proofing apparatus 40 according to the first embodiment of the present invention.
FIG. 2 is a diagram showing the overall configuration of a 0.

FIG. 5 is a diagram showing an example of a method for performing a color conversion instruction to sRGB color using a GUI according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a method of specifying, by a GUI, a white display level to be displayed in an area around an image after sRGB color conversion according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing a flow of a process in the color proofing method according to the first embodiment of the present invention.

FIG. 8 is a color proofing apparatus 40 according to Embodiment 2 of the present invention.
FIG. 2 is a diagram showing the overall configuration of a 0.

FIG. 9 is a diagram for conceptually explaining conversion between RGB digital values and CIE / XYZ tristimulus values according to the second embodiment of the present invention.

FIG. 10 is a flowchart showing a process flow in a color proofing method according to Embodiment 2 of the present invention.

[Explanation of symbols]

400: color proofing device, 410: image display application unit, 41
1. Profile selection unit 412 ICC profile reading unit 413 Color conversion unit A 414 White frame creation unit
415: image display unit, 416: monitor characteristic reading unit,
417: color conversion unit B, 420: OS system unit, 430
… ROM in the monitor

Continued on front page F-term (reference) 5B057 AA20 BA25 BA26 CA01 CA08 CA12 CA16 CB01 CB08 CB12 CB16 CC01 CE08 CE17 CE18 DA16 DA17 5C077 LL11 MM27 MP08 PP15 PP31 PP32 PP36 PP37 PP66 PQ08 PQ12 SS05 SS06 5C079 HB01 H0501 NA27 NA29 PA05 5C082 AA01 BA12 BA34 BA35 CA12 CA84 CA85 CB03 DA86 MM02

Claims (10)

[Claims] An apparatus for color-calibrating the color of a color image displayed on a window of a display device to which an RGB signal is input, wherein the RGB signal is converted into a color signal having a predetermined color value using an sRGB ICC profile. The color signal is converted to an sRGB color signal using an ICC profile suitable for the display device, and the sRGB color signal is used as an image signal for displaying an image in sRGB color on a window of the display device. A color proofing apparatus, comprising: a color conversion unit, wherein the display device displays an image in sRGB color on the window using the sRGB color image signal. 2. An apparatus for calibrating the color of a color image displayed on a window of a display device to which an RGB signal is input, wherein said RGB signal is converted into a color signal having a predetermined color value using an sRGB ICC profile. , White point chromaticity data, RGB chromaticity data, and monitor gradation characteristic data (R
GB gamma value) using the monitor color control data including the color signal is converted to an sRGB color signal, and the sRGB color signal is converted to an image signal for displaying an image in sRGB color on a window of the display device. A color conversion unit for displaying an image in sRGB color on the window using the sRGB color image signal. 3. An apparatus for calibrating a color of a color image displayed in a window of the display device, comprising: a profile selecting unit for instructing conversion by the color conversion unit using a GUI for inputting from the window. 3. The apparatus according to claim 1, further comprising a unit, wherein the color conversion unit converts the input RGB signal into the sRGB color image signal in accordance with an instruction input from the profile selection unit. Color proofing device. 4. An apparatus for performing color calibration of a color of a color image displayed in a window of the display device, wherein a frame of a window for displaying an image is made larger than a display image, and a frame between the display image and the window is displayed. The display device further includes white frame creation means for generating white frame data for displaying a reference white (D65) of an sRGB standard monitor in an area between the display image and the display image using the white frame data. 2. An sRGB standard monitor for displaying a reference white color (D65) in a region between the window and a window frame.
4. The color proofing device according to any one of claims 3 to 3. 5. The GUI according to claim 1, wherein the profile selection unit includes a GUI.
Means for specifying the signal level of the reference white of the sRGB standard monitor by using, the display device displays the reference white of the sRGB standard monitor at the specified signal level. 4. The color proofing device according to 4. 6. A method for color-calibrating a color of a color image displayed on a window of a display device to which an RGB signal is input, comprising converting the RGB signal into a color signal having a predetermined color value using an sRGB ICC profile. The color signal is converted to an sRGB color signal using an ICC profile suitable for the display device, and the sRGB color signal is used as an image signal for displaying an image in sRGB color on a window of the display device. A color conversion step, wherein the display device displays an image in sRGB color on the window using the sRGB color image signal. 7. A method for color-calibrating a color of a color image displayed on a window of a display device to which an RGB signal is input, comprising converting the RGB signal into a color signal having a predetermined color value using an sRGB ICC profile. , White point chromaticity data, RGB chromaticity data, and monitor gradation characteristic data (R
GB gamma value) using the monitor color control data including the color signal is converted to an sRGB color signal, and the sRGB color signal is converted to an image signal for displaying an image in sRGB color on a window of the display device. A color conversion step, wherein the display device displays an image in sRGB color on the window using the sRGB color image signal. 8. A method for performing color calibration of a color of a color image displayed in a window of the display device, comprising: selecting a profile instructing conversion in the color conversion step by using a GUI for inputting from the window. Further comprising the step of: converting the input RGB signal into the sRG according to an instruction input in the profile selecting step.
8. The color proofing method according to claim 6, wherein the color proofing method converts the image signal into a B-color image signal. 9. A method of performing color calibration of a color of a color image displayed in a window of a display device, comprising: setting a frame of a window for displaying an image larger than a display image; A white frame generating step of generating white frame data for displaying a reference white (D65) of an sRGB standard monitor in an area between the display image and the display image using the white frame data; 7. A reference white color (D65) of an sRGB standard monitor is displayed in an area between the window and a frame of the window.
9. The color proofing method according to any one of claims 1 to 8. 10. The profile selecting step is a step of specifying a reference white signal level of the sRGB standard monitor using the GUI, and the display device includes:
10. The color calibration method according to claim 9, wherein a reference white color of the sRGB standard monitor is displayed at the designated signal level.