JPH11234530A - Printer gamma correction method, image processing unit and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct gamma correction of a printer on a monitor screen without using a measuring instrument. SOLUTION: An image display system 7 allows an output device 4 to print out data 3 of a test image and allows a display device 1 to display the data 3 on a monitor. The operator adjusts a color of the monitored image so that the printed-out image is coincident with the monitored image and stores gamma data after color adjustment to an output device profile 5. The test image desirably includes a color mixture pattern generated from ink including C, M, Y colors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer gamma correction method for correcting printer gamma in a color printer or the like, an image processing apparatus, and a recording medium on which a printer gamma correction program is recorded.

[0002]

2. Description of the Related Art When outputting an image, there is a problem that colors do not match between a display device and an output device. Therefore,
Recently, information such as the color gamut of each device is stored in a file (hereinafter, referred to as a profile) in advance, and when performing color conversion between the devices, these profiles are referred to. It is possible to reproduce faithful colors (hereinafter, such a method is called color matching).

[0003] However, even with such a method, it is difficult to achieve perfect agreement between the two because of the aging of the system equipment. Therefore, various methods for solving such a problem have been proposed.

[0004]

SUMMARY OF THE INVENTION For example, Japanese Patent Application Laid-Open No. Hei 5-3
In the image forming apparatus described in Japanese Patent No. 36287, an image read by a scanner is displayed on a monitor device before printing to reduce an error between the original image and the printed image, and color correction is performed on the monitor. Print out after going.

Further, in the image processing method and apparatus described in Japanese Patent Application Laid-Open No. 8-23437, in order to reduce the error between the original image and the color copy image,
By displaying a preview image of a document read by a scanner on a monitor once, correcting the color on the monitor, and then executing a copy operation, a better match between the two is achieved.

However, any of the above-described methods is a correction method using a scanner as a measuring device, and does not consider a method of performing correction without a measuring device.

An object of the present invention is to provide a printer gamma correction method, an image processing apparatus, and a recording medium on which a printer gamma correction program is recorded, which can perform gamma correction of a printer on a monitor screen without using a measuring instrument. It is in.

[0008]

According to the first aspect of the present invention, there is provided an image processing apparatus comprising a color image display unit, a color image printing unit, and an image processing unit. In the system, there is provided a method of correcting the printer gamma of the printing means, wherein a test image composed of a plurality of colors of N gradations is printed, the test image is displayed on a monitor, and the printed image is displayed on the monitor. The color adjustment is performed while sequentially superimposing the colors of the image on the monitor so that the displayed image matches, and the printer gamma is corrected using the parameter values obtained after the color adjustment.

[0009] The invention according to claim 2 is characterized in that the test image includes a mixed color pattern generated from inks including C, M, and Y colors.

According to a third aspect of the present invention, as the test image, a pattern in which inks excluding K color are superposed one by one is used.

[0011] In the invention according to claim 4, when the printing means contains K color or spot ink,
The method is characterized in that a single color pattern for the ink is used in the test image.

According to a fifth aspect of the present invention, the test image is an image obtained by adaptively allocating the number of gradations to a portion where a predetermined standard gamma curve has a large change rate.

[0013] The invention according to claim 6 is characterized in that the test image is an image in which the number of gradations is adaptively distributed to a portion of the gamma curve that has been corrected last, where the rate of change is large.

According to a seventh aspect of the present invention, the object of the color adjustment is each color component value constituting an image on the monitor.

According to the present invention, the object of the color adjustment is a preview gamma value of the printing unit.

According to a ninth aspect of the present invention, after all the color adjustments, when the brightness of the image on the monitor and the printed image do not match, the entire tone is adjusted.

According to a tenth aspect of the present invention, the printer gamma is corrected by adjusting the offset of a preset standard gamma curve or the last corrected gamma curve using the adjusted parameter values. And

According to an eleventh aspect of the present invention, the corrected printer gamma is reflected on gamma data held by the image processing means.

According to a twelfth aspect of the present invention, the corrected printer gamma is reflected on gamma data held by the printing means.

According to a thirteenth aspect of the present invention, there is provided means for printing a test image composed of a plurality of colors of N gradations, means for storing printer gamma data of the printing means, means for displaying the test image, Means for sequentially superimposing the colors of the displayed image so that the printed image and the displayed image match, and adjusting the printer gamma data based on the parameter values obtained after the color adjustment. And a means for correcting

According to the fourteenth aspect of the present invention, the means for printing a test image composed of a plurality of colors of N gradations, the means for storing printer gamma data of the printing means, and the preview gamma data for the printing means are stored. Means for displaying the test image; means for performing color adjustment by sequentially superimposing each color of the displayed image so that the printed image matches the displayed image; and Means for correcting the printer gamma data and the preview gamma data based on parameter values obtained later.

According to the present invention, a means for printing a test image composed of a plurality of colors of N gradations, a means for storing printer gamma data of the printing means, and a preview gamma data for the printing means are stored. Means, means for displaying the test image, means for adjusting each color component value constituting the displayed image so that the printed image matches the displayed image, and the adjusted Means for correcting the printer gamma data and the preview gamma data based on each color component value.

According to a sixteenth aspect of the present invention, there is provided an image processing apparatus comprising: a color image display unit; a color image printing unit; and an image processing unit. First means for correcting input image data according to a printer gamma curve and outputting the corrected data;
A second unit that corrects image data output from the printing unit to the image processing unit or the display unit according to a preview gamma curve and outputs the corrected image data; and an image when a test image including a plurality of colors of N gradations is printed. Means for generating a preview gamma curve when the images at the time of displaying the test image match, means for generating a printer gamma curve based on the generated preview gamma curve, and the generated preview gamma The apparatus is characterized by comprising means for storing a curve in the second means, and means for storing the generated printer gamma curve in the first means.

According to the seventeenth aspect of the present invention, a function of printing a test image composed of a plurality of colors of N gradations, a function of storing printer gamma data for the printing, a function of displaying the test image, A function of sequentially superimposing the colors of the displayed image so that the printed image matches the displayed image, and a function of adjusting the printer gamma based on the parameter values obtained after the color adjustment. It is a computer-readable recording medium on which a program for causing a computer to realize a function of correcting data is recorded.

According to the eighteenth aspect of the present invention, a function of printing a test image composed of a plurality of colors of N gradations, a function of storing printer gamma data and preview gamma data for the printing, and displaying the test image A function of sequentially superimposing the colors of the displayed image so that the printed image matches the displayed image, and a function of adjusting the parameter values obtained after the color adjustment. A computer-readable recording medium on which a program for causing a computer to implement the function of correcting the printer gamma data and the preview gamma data is recorded.

According to the nineteenth aspect of the present invention, a function of printing a test image composed of a plurality of colors of N gradations, a function of storing printer gamma data and preview gamma data for the printing, and displaying the test image A function of adjusting the color component values of the displayed image so that the printed image matches the displayed image; and a printer based on the adjusted color component values. It is a computer-readable recording medium on which a program for causing a computer to implement a function of correcting gamma data and preview gamma data is recorded.

In the twentieth aspect, a first function of correcting image data input from a function of processing an image to a printing function in accordance with a printer gamma curve and outputting the corrected image data;
A second function of correcting image data output from the printing function to the image processing function or the display function in accordance with a preview gamma curve and outputting the image data, and an image obtained by printing a test image including a plurality of colors of N gradations. A function of generating a preview gamma curve when the images when the test image is displayed match, a function of generating a printer gamma curve based on the generated preview gamma curve, and a function of the generated preview gamma A computer-readable recording medium storing a program for causing a computer to implement a function of storing a curve in the second function and a function of storing the generated printer gamma curve in the first function. It is characterized by.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. <Embodiment 1> FIG. 1 shows a system configuration diagram of an embodiment of the present invention. In FIG. 1, a display device 1 is a display monitor, an output device 4 is a printer, and an input device 6 is a keyboard or a pointing device for giving an instruction to the image display system.

The image display system 7 includes an information storage device,
A program for executing processing is configured by an information processing device, an input / output device, and the like, and is stored in an information storage device. The operator is configured to interact with the image display system 7 through a user interface mounted on the screen of the display device 1.

Each of the display device 1 and the output device 4 has γ
Files (display device profile 2 and output device profile 5) are stored, and the image display system 7 has a function of exchanging information between devices.
Color matching is realized by performing color conversion, γ correction, and the like based on the profiles of the display device profile 2 and the output device profile 5.

Here, a configuration is adopted in which these profiles 2 and 5 are provided separately from the image display system 7.
It may be incorporated in the image display system 7.

FIG. 4 shows the configuration of the output device profile. FIG. 5 shows the flow of data at the time of printing.
Shows the flow of data during preview. The configuration of other display device profiles is the same. The profile includes a color conversion unit and a γ correction unit. That is, parameters for converting the internal data format to the data format of the output device are set in the color conversion unit 21 and the γ correction unit 22, and the data of the output device are stored in the color conversion unit 24 and the γ correction unit 23. Parameters for converting the format to the internal data format are set.

The gamma correction unit 22 performs gamma correction on the internal data to output printer data depending on the characteristics of the printer, and the gamma correction unit 23 performs gamma correction on the data depending on the characteristics of the printer. By doing so, internal data that does not depend on the characteristics of the printer is output.

The color conversion unit converts the data format held in the system into a data format specific to the printer (mostly CMYK).
Format). Such a color conversion means may be constituted by a look-up table, or may have data as a table only for a limited number of input points (called grid points), and perform interpolation calculation for data outside the grid points. The output data may be determined. In the following description, for simplicity, color conversion is performed by a configuration using only a lookup table.

FIGS. 2 and 3 show a processing flowchart of the present invention. 8, 9, 10, and 11 show operation screens of the present invention.

The test image data 3 is input to the image display system 7, and at the time of printing, as shown in FIG. 5, the test image data is color-converted by the color conversion unit 21 and gamma correction is performed by the gamma correction unit 22, The printout is output to the output device 4. At the time of preview, as shown in FIG. 6, the reverse conversion (γ correction 23,
Color conversion 24) is performed, and parameters (γ correction 25, color conversion 26) in the display device profile 2 are also used, and finally converted into a format (RGB) that can be expressed by the display device 1,
Display to operator.

In the following description, the printer uses CMYK inks and prints while controlling each color at 256 gradations (0 to 255), but the present invention is not limited to this.

FIG. 7 is an example of a test image used in the present invention. Since a printer using CMYK inks is assumed, there are columns of C, C + M, C + M + Y, and K inks, each of which has a gradation number. For simplicity,
Although the number of gradations of each ink row is set to 8 (each ink row is composed of eight patches), another number of gradations may be used. Also,
The ink component values of C, M, Y, and K are substantially equally spaced with respect to the full scale (in this example, 32 value intervals (= 256 /
8)) or any other method.

For example, when the standard gamma characteristic of the target output device can be regarded as substantially linear as shown in FIG. 23, the ink component values of the patches may be equally spaced (dotted line in the figure). However, in the case of a curve whose standard gamma characteristic is shown by a solid line in FIG. Good gamma correction becomes possible. In this case, the standard gamma characteristics may be stored separately from the output device characteristics, for example, in the image display system 7 of FIG. At this time, the configuration may be such that each ink component value of the print patch is determined with reference to a standard gamma characteristic when the test image is printed. In this case, the reference destination may be a gamma characteristic stored in the output device profile 5 in FIG. 1 instead of the standard gamma characteristic. In that case, each ink component value of the patch is determined based on the gamma curve that has been calibrated last.

First, the test image shown in FIG. 7 is printed (step 101). Since the test image is composed of CMYK data, there is no need to perform color conversion for the printer, and the test image is printed by the output device 4 through the data bus of FIG. Next, as shown in FIG. 6, a preview image of the test image is displayed on a monitor (step 102). At this time,
Since the test image is CMYK data, it is sent to the output device 4 without passing through the color conversion unit 21 and the γ correction unit 22 of the output device profile in FIG. The test image is output from the color conversion unit 24 and the γ correction unit 2 of the output device profile.
3 converts the data from the printer data format to the internal data format.
6. The data is converted into the internal data format of the display device by the γ correction unit 25) and is preview-displayed on the monitor.

FIG. 8 is a view showing a C-color patch represented by a mixture of R, G, and B components on a screen. FIG. 8 shows an example in which four columns of the image of the C ink are divided into right and left, but the display format is not limited to this and may be another format.

The operator can print the test image,
The test images on the display screen are compared, and the values of each column and each patch are sequentially adjusted according to the processing procedure shown in FIG. 2 so that the two match. Here, the C value of the patch in the C column is first adjusted (steps 103 and 104), and then the M value in the C + M column is adjusted.
The values are adjusted (steps 105, 106, 107), and the Y value of the C + M + Y column is adjusted (steps 108, 10).
9, 110), and finally adjust the K value of the patches in the K column sequentially (steps 111, 12, 113). 9 and 10,
FIG. 11 shows a C + M color screen display, a C + M + Y color display screen, and a K color screen display, respectively.

As described above, by sequentially superimposing the colors (C, M, Y) and adjusting the colors, an error is superimposed on the C + M + Y column. Further, in the C + M + Y column, the color of the patch approaches an achromatic color, so that the error is more easily perceived. The synergistic effect of the two makes it possible to perform gamma correction with high accuracy even with visual observation. Here, the reason for adjusting the K column independently is that if four colors of C, M, Y, and K are overlapped at the same time, the brightness of the patch is greatly reduced and errors are hardly perceived, and as a result, the accuracy of gamma correction is reduced. This is to prevent that.

The adjustment can be made by clicking the arrow 32 on the screen with the pointing device 31 of the input device 6, or by specifying a numerical value box 33 and inputting a numerical value from a keyboard. Since the value of the numerical value box indicates a deviation from each component value of the displayed patch, a value of 0 is included in each numerical value box in the initial state.

As a procedure for presenting to the operator, after the adjustment of each column, the display may return to the previous screen and the value may be readjusted. Also, the order of adjustment is not limited to this example. For example, the test image may be composed of M colors, M + C colors, M + C ten Y colors, and K colors, and the adjustment may be performed in this order. Further, if possible, all patch rows may be displayed simultaneously on one screen. Also, if the printer is not equipped with K ink, of course, neither K printing nor adjustment is required. Further, when the printer is provided with spot ink (special color ink), it is necessary to prepare and adjust independent rows similarly to K color.

When the adjustment is completed for all patches in all columns of the test image in this manner, each numerical value BO
The value of X, that is, the shift amount corresponding to each color component is obtained (Δ
C [N], ΔM [N], ΔY [N], ΔK [N]). Based on these values, gamma curve estimation for each ink color is performed (steps 114 and 115). In this example, the number of adjusted patches is eight for each color, and the amount of ink is variable in 256 steps for each color. Therefore, it is sufficient to interpolate the obtained data of eight points for each color by some method to draw an estimation curve.

FIG. 12 shows a diagram for performing gamma curve estimation. Here, the C color will be described as an example. × in the figure
The coordinate value (ΔC [N]) obtained for the C color is shown, and the dotted line shows the estimated curve. The gamma curve (OUT = fc pv (IN)) of the preview before correction is known as shown by the solid line in FIG. Further, the C ink values (C1..., C8) of the eight points in the test image are also known. Further, since the deviation amount (ΔC [N]) was also obtained in step 103,
The coordinates D [k] of the eight patches indicated by × points are as follows: D [k] = (Ck + ΔC [k], fc pv (Ck + Δ
C [k]), and all eight coordinate values are obtained. The corrected preview gamma curve may be drawn so as to pass through these points. Although any method may be used, for example, there is a method of drawing an estimation curve by n-order approximation. In this case, the order n
It is desirable that the value be determined in advance in accordance with the characteristics of the printing device, and be held by the system.

Since the curve obtained as described above is a preview gamma curve (dotted line in FIG. 12), the printer gamma (FIG. 5) is simultaneously converted from the completed preview gamma.
The gamma correction unit 22) also needs to be corrected (step 11).
5). The printer gamma may be obtained from the inverse function of the preview gamma curve, or, as shown in FIG. 13, the X and Y values of the coordinates D [k] of the eight patches are exchanged, and the estimated curve is redrawn. You may.

The above processing is repeated for the ink color. The preview gamma curve of the printer determined in this way is stored in the gamma correction unit 23 of the output device profile 5 of FIGS. 1 and 4, and the printer gamma curve is stored in the gamma correction unit 22 of the output device profile 5 of FIGS. The gamma correction process is completed by storing the data respectively (step 116).

Thus, the input image data (IN) in the printer data format is converted into a preview gamma curve (FIG. 12).
The output image data (OUT) in the internal data format corrected in accordance with the following formula (1), and the input image data (IN) in the internal data format is output image data (OU) in the printer data format corrected according to the printer gamma curve (FIG. 13).
T).

The gamma correction units 22 and 23 in FIG. 4 are desirably constituted by a magnetic disk, a nonvolatile memory, a memory with a battery backup, or the like so that data is not lost even when the power is turned off. Further, the γ correction unit 2 shown in FIG.
2 and 23 may be held by the image display system 7 side,
It may be held on the output device 4 side. If the data is to be provided on the output device 4 side, for example, a printer control unit (not shown) having a function of converting a signal received from the outside of the printer into a printer-specific data format (often a CMKY format) is provided. , The data of the γ correction units 22 and 23 in FIG.

Second Embodiment FIGS. 14 to 17 are diagrams for explaining a gamma correction method according to a second embodiment. The configuration and processing procedure of the second embodiment are the same as those of the first embodiment. The difference from the first embodiment is that the adjustment target is not the test image but the preview gamma curve of the output device profile (γ correction unit 23 in FIG. 4).

14 to 17 show a preview image of a test image on a monitor and a preview gamma curve simultaneously displayed on the same screen. The difference between FIGS. 8 to 11 of the first embodiment and FIGS. 14 to 17 of the second embodiment is that the numerical value BOX of FIGS.
Instead of displaying a preview gamma curve. That is, a circle on the curve corresponds to each patch. When the circle on the curve is moved by the pointing device, the color of the patch on the screen changes according to the change in the movement amount in the OUT direction. That is, the adjustment is performed using the numerical value BO of the first embodiment.
This is performed by operating the curve on the screen instead of X. Such a process may be performed on all the printed patch strings.

14 to 17, the columns of the C ink image are divided into four columns on the left and right sides for simplicity, but the display format is not limited to this example. The order of the adjustment is not limited to this example. For example, the test image may be composed of M, M + C, M + C + Y, and K colors, and the adjustment may be performed in this order. Also, if the printer is not equipped with K ink, of course, neither K printing nor adjustment is necessary. Further, when the printer is provided with spot ink (special color ink), it is necessary to prepare and adjust independent rows similarly to K color.

When the adjustment is completed for all the patches in all the rows of the test image in this way, the curve may be generated so as to pass through all the coordinates of the circles on the obtained curves. As the method, any method may be used as in the first embodiment.

The resulting curve is the preview gamma curve itself. The above process is repeated for each ink color. Further, a printer gamma curve is generated from the completed preview gamma curve in the same manner as in the first embodiment, the preview gamma curve is stored in the γ correction unit 23 in FIG. 4, and the printer gamma curve is stored in the γ correction unit 22. Good.

Embodiment 3 Embodiment 3 will be described with reference to FIGS. 18, 19, 20, and 21. The configuration of the third embodiment is the same as that of the first embodiment. The difference from the first embodiment is that the entire tone correction process (step 2)
15, 216).

FIGS. 18 and 19 show a processing flowchart of the third embodiment, and FIG. 20 shows a state of the processing. FIG.
Shows the state of the processing performed following FIG. 11 (STEP-4). The tone control numerical value BOX displayed on the screen is adjusted in the same manner as the ink component amount, so that the printed test image matches the test image on the screen.
The value adjusted here is applied to all patches.

The method of this adjustment is not limited to this example.
For example, instead of a method of uniformly adjusting all patches as described above, a method of adjusting using a graph as shown in FIG. 21 is also possible. In this case, a graph for tone control is displayed on the screen, and the graph is adjusted with a pointing device. The operator deforms the graph with a pointing device so that the printed test image matches the test image on the screen. After the adjustment is completed, the function indicating the graph may be applied to all the patches.

Embodiment 4 Embodiment 4 will be described with reference to FIG. The configuration of the entire apparatus according to the fourth embodiment and the processing procedure of the operator are the same as those of the first embodiment. The difference from the first embodiment lies in the method of estimating the gamma curve. Upon completion of each color adjustment in the first embodiment, a shift amount corresponding to each color component is obtained (ΔC [N], ΔM [N], ΔY [N], ΔK
[N]). From these values, the gamma curve of each ink color is estimated. Here, the C color will be described as an example. FIG.
The point x in the middle is the coordinate value (C [N]) obtained for the C color
, And the gamma curve before correction is indicated by a solid line. In this embodiment, the gamma curve before correction is shifted by Doffset without using the approximation curve, and the error from the coordinate point indicated by the X point is minimized. Any algorithm may be used to determine Doffset.

The above processing is repeated by the number of ink colors to determine the offset value of each ink color. The method according to the present embodiment is particularly effective when the shape of the gamma curve is complicated.

The present invention is not limited to the above-described embodiment, but can be realized by software. When the present invention is implemented by software, a general-purpose computer system is prepared, and a recording medium such as a CD-ROM records processing procedures and processing functions for correcting printer gamma. Further, a test image stored in a hard disk or the like is printed and displayed on a monitor, color adjustment is performed on the monitor according to the above-described processing procedure, and the adjusted gamma data is stored in a hard disk or the like.

[0063]

As described above, according to the present invention, gamma correction of a printer can be performed on a screen by an operator's eyes without using a measuring instrument. In addition, since the adjustment is performed while sequentially superimposing the colors of the test image on the monitor, highly accurate gamma correction can be performed.

[Brief description of the drawings]

FIG. 1 shows a configuration of an embodiment of the present invention.

FIG. 2 shows a processing flowchart of Embodiment 1 of the present invention.

FIG. 3 shows a processing flowchart continued from FIG. 2;

FIG. 4 shows the configuration of an output device profile.

FIG. 5 shows a data flow during printing.

FIG. 6 shows a data flow at the time of preview.

FIG. 7 shows an example of a test image.

FIG. 8 illustrates a first operation screen according to the first embodiment.

FIG. 9 shows a second operation screen of the first embodiment.

FIG. 10 illustrates a third operation screen according to the first embodiment.

FIG. 11 illustrates a fourth operation screen according to the first embodiment.

FIG. 12 is a diagram illustrating estimation of a gamma curve.

FIG. 13 shows a corrected printer gamma curve.

FIG. 14 illustrates a first operation screen according to the second embodiment.

FIG. 15 illustrates a second operation screen according to the second embodiment.

FIG. 16 illustrates a third operation screen according to the second embodiment.

FIG. 17 illustrates a fourth operation screen according to the second embodiment.

FIG. 18 shows a processing flowchart of the third embodiment.

FIG. 19 shows a processing flowchart following that of FIG. 18;

FIG. 20 illustrates an example of an operation screen according to the third embodiment.

FIG. 21 is a diagram for correcting a tone using a graph.

FIG. 22 shows a gamma curve correction method according to the fourth embodiment.

FIG. 23 illustrates an example of a gamma characteristic of the printer.

FIG. 24 shows another example of the gamma characteristic of the printer.

[Explanation of symbols]

 Reference Signs List 1 display device 2 display device profile 3 image data 4 output device 5 output device profile 6 input device 7 image display system

Claims (20)

[Claims] 1. An image processing system comprising: a color image display unit; a color image printing unit; and an image processing unit. A method for correcting a printer gamma of the printing unit, comprising: A test image consisting of a plurality of colors is printed, the test image is displayed on a monitor, and the colors of the image on the monitor are sequentially displayed so that the printed image matches the image displayed on the monitor. A printer gamma correction method, wherein color adjustment is performed while overlapping, and printer gamma is corrected using parameter values obtained after the color adjustment. 2. The method according to claim 1, wherein the test images include C color, M color, and Y color.
2. The printer gamma correction method according to claim 1, further comprising a color mixture pattern generated from ink containing a color. 3. The printer gamma correction method according to claim 1, wherein a pattern in which inks excluding K color are superposed one by one is used as the test image. 4. The printer gamma correction method according to claim 1, wherein when the printing means includes K color or spot ink, a single color pattern for the ink is used in the test image. 5. The printer gamma according to claim 1, wherein the test image is an image obtained by adaptively allocating the number of gradations to a part of a standard gamma curve having a large change rate set in advance. Correction method. 6. The printer gamma correction method according to claim 1, wherein the test image is an image obtained by adaptively allocating the number of gradations to a portion where the rate of change of the last corrected gamma curve is large. . 7. The printer gamma correction method according to claim 1, wherein the target of the color adjustment is each color component value forming an image on the monitor. 8. The printer gamma correction method according to claim 1, wherein the target of the color adjustment is a preview gamma value of the printing unit. 9. The printer gamma correction method according to claim 1, wherein after all the color adjustments, when the brightness of the image on the monitor and the printed image do not match, the entire tone is adjusted. . 10. Using the adjusted parameter values,
2. The printer gamma correction method according to claim 1, wherein the printer gamma is corrected by adjusting an offset of a preset standard gamma curve or a last corrected gamma curve. 11. The printer gamma correction method according to claim 1, wherein said corrected printer gamma is reflected on gamma data held by said image processing means. 12. The printer gamma correction method according to claim 1, wherein the corrected printer gamma is reflected on gamma data held by the printing unit. 13. A means for printing a test image composed of a plurality of colors of N gradations, a means for storing printer gamma data of the printing means, a means for displaying the test image, and a method for displaying the printed image. Means for sequentially superimposing each color of the displayed image so as to match the displayed image, and means for correcting the printer gamma data based on the parameter values obtained after the color adjustment. An image processing apparatus comprising: 14. A means for printing a test image comprising a plurality of colors of N gradations, a means for storing printer gamma data of the printing means, a means for storing preview gamma data for the printing means, and the test image Means for displaying
Means for sequentially superimposing each color of the displayed image so that the printed image matches the displayed image, and adjusting the printer gamma based on the parameter values obtained after the color adjustment. An image processing apparatus comprising: data and means for correcting preview gamma data. 15. A means for printing a test image composed of a plurality of colors of N gradations, a means for storing printer gamma data of the printing means, a means for storing preview gamma data for the printing means, and the test image Means for displaying
Means for adjusting each color component value constituting the displayed image so that the printed image matches the displayed image; and a printer gamma data and preview based on the adjusted color component values. Means for correcting gamma data. 16. An image processing apparatus comprising: a color image display unit; a color image printing unit; and an image processing unit. The image processing apparatus converts image data input from the image processing unit to the printing unit. First means for correcting and outputting according to a printer gamma curve, and image data output from the printing means to the image processing means or display means,
Second means for correcting and outputting according to a preview gamma curve, and a preview gamma curve when an image when a test image composed of a plurality of colors of N gradations is printed matches an image when the test image is displayed Means for generating
Means for generating a printer gamma curve based on the generated preview gamma curve; means for storing the generated preview gamma curve in the second means; and means for storing the generated printer gamma curve in the first means. An image processing apparatus comprising: means for storing in an means. 17. A function for printing a test image composed of a plurality of colors of N gradations, a function for storing printer gamma data for the printing, a function for displaying the test image,
A function of sequentially superimposing the colors of the displayed image so that the printed image matches the displayed image, and a function of adjusting the printer gamma based on the parameter values obtained after the color adjustment. A computer-readable recording medium on which a program for causing a computer to implement a function of correcting data is recorded. 18. A function for printing a test image composed of a plurality of colors of N gradations, a function for storing printer gamma data and preview gamma data for the printing, a function for displaying the test image, and a function for printing the test image. A function of sequentially superimposing the colors of the displayed image so that the displayed image matches the displayed image, and a function of adjusting the printer gamma data based on the parameter values obtained after the color adjustment. A computer-readable recording medium on which a program for causing a computer to implement a function of correcting preview gamma data is recorded. 19. A function for printing a test image composed of a plurality of colors of N gradations, a function for storing printer gamma data and preview gamma data for the printing, a function for displaying the test image, and a method for printing the test image. A function of adjusting each color component value constituting the displayed image so that the displayed image matches the displayed image, and the printer gamma data and the preview gamma data based on the adjusted color component values. And a computer-readable recording medium on which a program for causing a computer to realize a function of correcting the image is recorded. 20. A first function of correcting image data input from a function of processing an image to a printing function according to a printer gamma curve and outputting the corrected image data, and outputting the image data from the printing function to the image processing function or the display function. Image data
A second function of correcting and outputting according to the preview gamma curve, and a preview gamma curve when an image when a test image including a plurality of colors of N gradations is printed matches an image when the test image is displayed. Function to generate
A function of generating a printer gamma curve based on the generated preview gamma curve; a function of storing the generated preview gamma curve in the second function; and a function of storing the generated printer gamma curve in the first function. A computer-readable recording medium in which a program for causing a computer to realize a function to be stored in a function is recorded.