JP2006094117A - Image processing apparatus, processing method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processing system, in which substantially uniform color adjustment result can be made to be reflected on output images from a plurality of image output apparatus. <P>SOLUTION: A client PC 4 (image program 5) converts inputted image data (RGB image) into a virtual color space, combining the color reproduction zones of a plurality of printers 10, converts image data in the virtual color space into image data (Lab image) of a color space for color adjustment, thus performing color adjustment processing that is limited to be within the color reproduction range of the virtual color space. The client PC 4 (image program 5) converts the image data (Lab image), subjected to color adjustment processing, into image data (CMYK image) of the output color space of each printer 10 and transmits the image data to each printer 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image processing apparatus that performs color adjustment of image data.

For example, Patent Literature 1 refers to a virtual color reproduction range B that includes the color reproduction range A, performs color compression of input color data, and refers to the color reproduction range A for the color data subjected to this color compression. Thus, a color conversion device that performs color compression is disclosed.
Further, Patent Document 2 converts device data in the characteristic device space of the first color system into device data in the first standard color space, and converts the device data in the first standard color space to the second standard color space. A color conversion method for converting the device data of the second standard color space into the device data of the specific device space of the second color system is disclosed.
JP 2002-252785 A JP 2000-050092 A

  The present invention has been made from the above-described background, and an object thereof is to provide an image processing apparatus that can appropriately reflect the result of color adjustment.

[Image processing device]
In order to achieve the above object, an image processing apparatus according to the present invention includes a color gamut compression unit that performs color gamut compression corresponding to a color reproduction gamut including a plurality of image output reproduction gamuts on input image data. And color adjustment means for performing color adjustment on the image data subjected to color gamut compression by the color gamut compression means.

  Preferably, the color gamut compression means performs color gamut compression corresponding to one image output reproduction area among a plurality of image output reproduction areas.

  Preferably, the color adjustment means performs color adjustment processing only within the color reproduction range.

  The image processing apparatus according to the present invention includes: first color conversion means for converting input image data into image data in a virtual color space having a predetermined color reproduction range; and the first color conversion means. The converted image data in the virtual color space is converted into image data in the adjustment color space for performing color adjustment, and the image data in the adjustment color space converted by the second color conversion means. On the other hand, it has color adjustment means for performing color adjustment.

  The image processing apparatus according to the present invention includes a color conversion unit that converts input image data into image data for color adjustment using a color conversion formula corresponding to a predetermined color gamut, and the color conversion. Color adjustment means for performing color adjustment on the image data for color adjustment converted by the means.

[Image processing method]
The image processing method according to the present invention performs color gamut compression corresponding to a predetermined color gamut on input image data, and performs color adjustment on the image data subjected to color gamut compression. Do.

[program]
The program according to the present invention includes a step of performing color gamut compression corresponding to a predetermined color gamut on input image data in an image processing apparatus including a computer, and an image subjected to color gamut compression. And causing the computer of the image processing apparatus to perform color adjustment on the data.

  According to the image processing apparatus of the present invention, it is possible to reflect a substantially uniform color adjustment result on output images output by a plurality of image output apparatuses.

[System configuration]
First, the overall configuration of the image processing system 1 to which the present invention is applied will be described.
FIG. 1 is a diagram illustrating the overall configuration of the image processing system 1.
As illustrated in FIG. 1, the image processing system 1 includes a client PC 4 and a plurality of printer apparatuses 10. The client PC 4 and the plurality of printer apparatuses 10 are connected to each other via a network configured by a LAN or a WAN.
The client PC 4 is a general-purpose computer used by the user for image processing and the like. The client PC 4 creates image data in response to a user operation, transmits the created image data to the printer device 10, and requests printing processing.

[Printer]
Next, the printer apparatus 10 will be described.
FIG. 2 is a diagram illustrating a configuration of the tandem type printer apparatus 10.
As shown in FIG. 2, the printer device 10 includes an image reading unit 12, an image forming unit 14, an intermediate transfer belt 16, a paper tray 17, a paper conveyance path 18, a fixing device 19, and an image processing device 20. The printer apparatus 10 is a composite having a function as a full-color copying machine using the image reading apparatus 12 and a function as a facsimile in addition to a printer function for printing image data received from the client PC 4 (FIG. 1). It may be a machine.

  First, the outline of the printer apparatus 10 will be described. An image reading apparatus 12 and an image processing apparatus 20 are disposed above the printer apparatus 10 and function as image data input means. The image reading device 12 reads an image displayed on the document and outputs it to the image processing device 20. The image processing apparatus 20 performs color conversion, gradation correction, and image conversion on image data input from the image reading apparatus 12 or image data input from the client PC 4 or the like via a network such as a LAN (FIG. 1). Image processing such as resolution correction is performed and output to the image forming unit 14.

  Below the image reading device 12, a plurality of image forming units 14 are arranged corresponding to the colors constituting the color image. In this example, the first image forming unit 14K, the second image forming unit 14Y, and the third image forming corresponding to each color of black (K), yellow (Y), magenta (M), and cyan (C). The unit 14M and the fourth image forming unit 14C are arranged horizontally along the intermediate transfer belt 16 with a certain interval. The intermediate transfer belt 16 rotates as an intermediate transfer member in the direction of an arrow A in the figure, and these four image forming units 14K, 14Y, 14M, and 14C are configured based on the image data input from the image processing apparatus 20. The toner images are sequentially formed and transferred (primary transfer) to the intermediate transfer belt 16 at a timing at which the plurality of toner images are superimposed on each other. The order of the colors of the image forming units 14K, 14Y, 14M, and 14C is not limited to the order of black (K), yellow (Y), magenta (M), and cyan (C). ), Magenta (M), cyan (C), black (K), and the like.

  The sheet conveyance path 18 is disposed below the intermediate transfer belt 16. The recording paper 32 supplied from the paper tray 17 is transported on the paper transport path 18, and the toner images of each color transferred onto the intermediate transfer belt 16 are collectively transferred (secondary transfer). The transferred toner image is fixed by the fixing device 19 and discharged to the outside along the arrow B.

Next, each configuration of the printer device 10 will be described in more detail.
As shown in FIG. 2, the image reading unit 12 reads a platen glass 124 on which a document is placed, a platen cover 122 that presses the document onto the platen glass 124, and an image of the document placed on the platen glass 124. And an image reading device 130. The image reading apparatus 130 illuminates a document placed on the platen glass 124 with a light source 132, and reflects a reflected light image from the document into a full-rate mirror 134, a first half-rate mirror 135, and a second half-rate mirror. Scanning exposure is performed on an image reading element 138 made of a CCD or the like via a reduction optical system consisting of 136 and an imaging lens 137, and the color material reflected light image of the original 30 is given a predetermined dot density (by this image reading element 138. For example, it is configured to read at 16 dots / mm).

  The image processing apparatus 20 performs predetermined image processing such as shading correction, document position shift correction, brightness / color space conversion, gamma correction, frame deletion, color / moving editing, and the like on the image data read by the image reading unit 12. Apply processing. The color material reflected light image of the original read by the image reading unit 12 is, for example, original reflectance data of three colors of red (R), green (G), and blue (B) (each 8 bits), By the image processing by the image processing apparatus 20, it is converted into original color material gradation data of four colors of yellow (Y), magenta (M), cyan (C), and black (K) (each 8 bits).

The first image forming unit 14K, the second image forming unit 14Y, the third image forming unit 14M, and the fourth image forming unit 14C (image forming means) are arranged in parallel at regular intervals in the horizontal direction. The arrangement is almost the same except that the color of the image to be formed is different. Accordingly, the first image forming unit 14K will be described below. The configuration of each image forming unit 14 is distinguished by adding K, Y, M, or C.
The image forming unit 14K forms an electrostatic latent image by an optical scanning device 140K that scans a laser beam in accordance with image data input from the image processing device 20, and a laser beam scanned by the optical scanning device 140K. And an image forming apparatus 150K.

The optical scanning device 140K modulates the semiconductor laser 142K according to the black (K) image data, and emits the laser light LB (K) from the semiconductor laser 142K according to the image data. The laser beam LB (K) emitted from the semiconductor laser 142K is applied to the rotary polygon mirror 146K via the first reflection mirror 143K and the second reflection mirror 144K, and is deflected and scanned by the rotation polygon mirror 146K. The light is irradiated onto the photosensitive drum 152K of the image forming apparatus 150K through the second reflecting mirror 144K, the third reflecting mirror 148K, and the fourth reflecting mirror 149K.
The image forming apparatus 150K includes a photosensitive drum 152K as an image carrier that rotates at a predetermined rotational speed in the direction of arrow A, and primary charging as a charging unit that uniformly charges the surface of the photosensitive drum 152K. And a developing device 156K for developing the electrostatic latent image formed on the photosensitive drum 154K, and a cleaning device 158K. The photosensitive drum 152K is uniformly charged by the scorotron 154K, and an electrostatic latent image is formed by the laser beam LB (K) irradiated by the optical scanning device 140K. The electrostatic latent image formed on the photosensitive drum 152K is developed with black (K) toner by the developing device 156K and transferred to the intermediate transfer belt 16. Residual toner, paper dust, and the like adhering to the photosensitive drum 152K after the toner image transfer process are removed by the cleaning device 158K.
The other image forming units 14Y, 14M, and 14C also form yellow (Y), magenta (M), and cyan (C) toner images in the same manner as described above, and intermediately transfer the formed toner images of the respective colors. Transfer to belt 16.

The intermediate transfer belt 16 has a constant tension between the drive roll 164, the first idle roll 165, the steering roll 166, the second idle roll 167, the backup roll 168, and the third idle roll 169. The drive roll 164 is rotationally driven by a drive motor (not shown), and is circulated at a predetermined speed in the direction of arrow A. The intermediate transfer belt 16 is formed into an endless belt by, for example, forming a flexible synthetic resin film such as polyimide in a belt shape and connecting both ends of the synthetic resin film formed in a belt shape by welding or the like. It has been done.
Further, the intermediate transfer belt 16 includes a first primary transfer roll 162K, a second primary transfer roll 162Y, a third primary transfer roll 162M, and a position facing the image forming units 14K, 14Y, 14M, and 14C, respectively. A fourth primary transfer roll 162C is provided, and the toner images of the respective colors formed on the photosensitive drums 152K, 152Y, 152M, and 152C are transferred onto the intermediate transfer belt 16 in a multiple manner by these primary transfer rolls 162. The The residual toner adhering to the intermediate transfer belt 16 is removed by a cleaning blade or brush of a belt cleaning device 189 provided downstream of the secondary transfer position.

In the paper transport path 18, a paper feed roller 181 for taking out the recording paper 32 from the paper tray 17, a first roller pair 182, a second roller pair 183 and a third roller pair 184 for paper transport, and a recording paper A registration roll 185 is provided which conveys 32 to the secondary transfer position at a predetermined timing.
In addition, a secondary transfer roll 185 that is in pressure contact with the backup roll 168 is disposed at the secondary transfer position on the paper transport path 18, and each color toner image transferred onto the intermediate transfer belt 16 is Secondary transfer is performed on the recording paper 32 by the pressing force and electrostatic force of the secondary transfer roll 185. The recording paper 32 onto which the toner image of each color is transferred is conveyed to the fixing device 19 by the first conveyance belt 186 and the second conveyance belt 187.
The fixing device 19 melts and fixes the toner to the recording paper 32 by performing heat treatment and pressure treatment on the recording paper 32 to which the toner images of the respective colors are transferred.

[Client PC]
Next, the client PC 4 to which the present invention is applied will be described.
FIG. 3 is a diagram illustrating the hardware configuration of the client PC 4 to which the image processing method according to the present invention is applied, centering on the control device 40.
As illustrated in FIG. 3, the client PC 4 includes a control device 40 including a CPU 402 and a memory 404, a communication device 42, a recording device 44 such as an HDD / CD device, an LCD display device or a CRT display device, and a keyboard / touch panel. The user interface device (UI device) 46 including the above.

[background]
As illustrated in FIG. 1, it is desired that the plurality of printer apparatuses 10 included in the image processing system 1 output output images with substantially equivalent image quality. In response to such a demand, image data in an input color space (color space of color data generated by an image input device such as a scanner) is used as information indicating color reproduction characteristics of the image input device (for example, an image input device). The image data of the independent color space (Lab color space, etc.) independent of the device, and the image data (Lab value) of the independent color space indicates the color reproduction characteristics of the image output device. A method has been proposed in which information (such as an ICC profile of a printer device) is used to convert image data into an output color space (color space of color data used by an image output device such as a printer device) and output the image data. At this time, if color adjustment is performed on the image data in the input color space or the independent color space, the output images output from the plurality of image output devices can be substantially equivalent by applying the ICC profiles of the image output devices. It is thought that it can be made a good image quality.

However, the plurality of image output apparatuses may have different color gamuts (Gamut). Therefore, in these image output apparatuses, different color gamut compression processes are performed, and as a result, the image quality of the output image may be different.
Further, when color adjustment is performed as it is in the input color space or the like, the intention of adjustment may not be accurately reflected in the final output product. For example, when the color adjustment is performed outside the output color space, the color adjustment result becomes different from the adjustment intention by the color gamut compression.

Therefore, the image processing system 1 according to the present embodiment performs color gamut compression processing corresponding to a single color gamut on the input image data, and the image data subjected to the color gamut compression processing. Perform color adjustment processing. More specifically, the image processing system 1 converts the input image data into a virtual color space that includes the color gamuts of the plurality of printer apparatuses 10, and the image data in the virtual color space is used for color adjustment. Color adjustment processing is performed by converting the image data into color space image data. The color space for color adjustment is arbitrary such as RGB color space, Lab color space, and CMYK color space. In the present embodiment, a specific example is a case where the Lab color space is a color space for color adjustment.
Thereby, the same adjustment effect can be obtained with output images from different image output devices. Even when color adjustment processing is performed in a color space (RGB color space, Lab color space, etc.) that is different from the output color space (CMYK color space, etc.), the adjustment is made by considering the color gamut of the output color space in advance. The intention can be accurately reflected in the output image.

[Image processing program]
FIG. 4 is a diagram illustrating a functional configuration of the image processing program 5 which is executed by the client PC 4 (FIGS. 1 and 3) and implements the image processing method according to the present invention.
As illustrated in FIG. 4, the image processing program 5 includes an adjustment data generation unit 500, a color adjustment processing unit 530, and an output data generation unit 540. The adjustment data generation unit 500 includes an RGB / virtual conversion unit 510 and a virtual / Lab conversion unit 520. The output data generation unit 540 includes a Lab / CMYK conversion unit 550 and a CMYK conversion unit 560. Including.

In the image processing program 5, the adjustment data generation unit 500 generates color adjustment image data by performing color gamut compression processing corresponding to the color gamut of the output color space on the input image data. To do. This color gamut compression processing is based on, for example, a virtual color space that includes the color gamuts of a plurality of printer apparatuses 10 and that minimizes the difference in shape (volume) from these color gamuts. is there. That is, the adjustment data generation unit 500 of this example maps the input image data to this virtual color space with a minimum color difference. The virtual color space may be Japan Color or the like.
More specifically, the RGB / virtual conversion unit 510 converts input image data into image data in a virtual color space using an ICC profile or the like of the image input device.
Then, the virtual / Lab conversion unit 520 converts the image data in the virtual color space converted by the RGB / virtual conversion unit 510 into image data in the Lab color space (that is, the color space for color adjustment).
The adjustment data generation unit 500 converts the input image data (RGB image) into image data in the virtual color space, and uses the converted image data in the virtual color space for color adjustment. Data (R′G′B ′ image) may be converted.

  The color adjustment processing unit 530 performs color adjustment processing on the image data for color adjustment generated by the adjustment amount data generation unit 500 only within the color gamut of the virtual color space. For example, the color adjustment processing unit 530 calculates the L value, the a value, or the b value included in the image data in response to a user request or in accordance with input image data within the color reproduction range of the virtual color space. change.

The output data generation unit 540 generates output image data (for example, a CMYK image) based on the image data (Lab image) that has been subjected to the color adjustment processing by the color adjustment processing unit 530. For example, the output data generation unit 540 generates image data corresponding to the color gamut of each printer device 10 when images are output from the plurality of printer devices 10.
More specifically, the Lab / CMYK conversion unit 550 uses the ICC profile of each printer device 10 to convert image data (Lab image) subjected to color adjustment processing according to the color gamut of each printer device 10. Converted to image data (CMYK image).

  The color adjustment processing unit 530 can perform color adjustment processing on image data for output corresponding to the color reproduction range of one printer device 10. In this case, the CMYK conversion unit 560 uses the ICC profile of the other printer device 10 to output the output image data that has been subjected to the color conversion processing, for output corresponding to the color gamut of the other printer device 10. Convert to image data.

[Operation]
Next, the operation of the image processing program 5 will be described.
FIG. 5 is a flowchart illustrating the operation of the printing process (S10) in the image processing system 1.
As shown in FIG. 5, in step 100 (S100), the client PC 4 (FIG. 1) acquires image data to be processed in accordance with a user operation. For example, the client PC 4 receives image data (RGB image) read by the image reading unit 12 from the printer device 10.

  In step 110 (S110), the RGB / virtual conversion unit 510 of the adjustment data generation unit 500 (FIG. 4) converts the input image data to be processed (RGB image) into the image input device (image reading unit 12). Based on the profile, the image data is converted into image data in a virtual color space.

  In step 120 (S120), the virtual / Lab conversion unit 520 converts the image data of the virtual color space converted by the RGB / virtual conversion unit 510 into the image data of the color space for color adjustment (Lab color space in this example). Convert to (Lab image).

  In step 130 (S130), the color adjustment processing unit 530 performs color adjustment processing on the image data (Lab image) of the color space for color adjustment converted by the virtual / Lab conversion unit 520. The range of color adjustment processing is limited within the color reproduction range of the virtual color space.

  In step 140 (S140), the Lab / CMYK conversion unit 560 of the output data generation unit 540 (FIG. 4) converts the color-adjusted image data (Lab image) into an output color space (in this example, each printer device). 10 CMYK color space) image data (CMYK image). For example, the Lab / CMYK conversion unit 560 converts image data (Lab image) in the color space for color adjustment into image data (CMYK image) in the color space for output using the ICC profile of each printer device 10.

In step 150 (S150), the client PC 4 (output data generation unit 540) transmits the generated image data (CMYK image) of the output color space to each printer apparatus 10.
Image data (CMYK images) input to each printer 10 is input to each image forming unit 14. Each image forming unit 14 forms a toner image of each color based on the input image data, and transfers the formed toner image to the recording paper 32.
The recording paper 32 onto which the toner image has been transferred is subjected to a fixing process by the fixing device 19 (FIG. 2), and is discharged out of the printer device 10.

As described above, the image processing system 1 according to the present embodiment converts input image data into a virtual color space that includes the color gamuts of the plurality of printer apparatuses 10, and converts the image data in the virtual color space to the virtual color space. Then, the image data is converted into image data in a color space for color adjustment and color adjustment processing is performed.
Thereby, the same adjustment effect can be obtained with output images from different image output devices. Even when color adjustment processing is performed in a color space (RGB color space, Lab color space, etc.) that is different from the output color space (CMYK color space, etc.), the adjustment is made by considering the color gamut of the output color space in advance. The intention can be accurately reflected in the output image.

[Modification]
Next, a modification of the above embodiment will be described.
The image processing program 5 of the above embodiment performs color gamut compression processing on image data to be processed with reference to a virtual color space including the color reproduction gamut of each printer device 10, and is within the color reproduction range of the virtual color space. The range of color adjustment processing is limited. However, the present invention is not limited to this. For example, the image processing program 5 in the present modification is converted into image data to be processed on the basis of the output color space of one printer device (hereinafter referred to as the first printer device). Color gamut compression processing is performed to limit the range of color adjustment processing within the color reproduction range of the first printer device.

FIG. 6 is a flowchart for explaining the operation of the printing process (S20) when the color adjustment process is performed in the CMYK color space.
As shown in FIG. 6, in step 200 (S200), the client PC 4 (FIG. 1) receives image data (RGB image) read by the image reading unit 12 from the printer device 10 in response to a user operation. The received image data (RGB image) is a processing target.

  In step 210 (S210), the adjustment data generation unit 500 (FIG. 4) uses the input image data (RGB image) to be processed, the profile of the image input device (image reading unit 12), and a default printer. Based on the ICC profile of the apparatus 10, the image data is converted into image data (CMYK image) in the output color space of the printer apparatus 10.

  In step 220 (S220), the color adjustment processing unit 530 performs color adjustment processing on the image data (CMYK image) of the color space for color adjustment converted by the adjustment data generation unit 500. The range of color adjustment processing is limited within the color reproduction range of the printer device 10.

  In step 230 (S230), the output data generation unit 540 determines whether other printer devices that output image data other than the printer device 10 are designated, and other printer devices are designated. If YES in step S240, the process advances to step S240. If no other printer is designated, the process advances to step S250.

  In step 240 (S240), the CMYK conversion unit 560 of the output data generation unit 540 (FIG. 4) converts the image data subjected to the color adjustment processing (CMYK image corresponding to the first printer device) to the other printer device. It is converted into image data in the output color space (CMYK image corresponding to the color reproduction range of the second printer apparatus). For example, the CMYK conversion unit 560 uses the ICC profile of the first printer device 10 to convert image data (CMYK image) subjected to color adjustment processing into image data (Lab image) in the Lab color space. The image data (Lab image) in the Lab color space is converted into image data (C′M′Y′K ′ image) in the output color space of the second printer device 10 using the ICC profile of the second printer device 10. Convert.

In step 250 (S250), the client PC 4 (output data generation unit 540) transmits the generated image data of the output color space (at least one CMYK image corresponding to each printer device) to each printer device 10.
Image data (CMYK images) input to each printer 10 is input to each image forming unit 14. Each image forming unit 14 forms a toner image of each color based on the input image data, and transfers the formed toner image to the recording paper 32.
The recording paper 32 onto which the toner image has been transferred is subjected to a fixing process by the fixing device 19 (FIG. 2), and is discharged out of the printer device 10.

  Thereby, color adjustment processing can be performed based on the color reproduction range of one printer device (first printer device) among the plurality of printer devices 10.

Further, the image processing program 5 of the above embodiment directly performs color gamut compression processing or the like corresponding to the virtual color space on the image data to be processed, but is not limited to this. For example, By adjusting the profile that defines the color conversion process, substantially the same effect as when the color gamut compression process or the like is performed on the image data may be obtained.
In this case, the adjustment data generation unit 500 creates a link profile that converts image data in the input color space (input image data) into image data in the color adjustment color space via the virtual color space. Using the created link profile, the input image data (RGB image) is converted into image data for color adjustment (Lab image, CMYK image, R′G′B ′ image, etc.). The converted image data for color adjustment is subjected to color gamut compression processing corresponding to the color gamut of the virtual color space.

  Further, the image processing program 5 may create a link profile that also includes color adjustment processing. That is, the image processing program 5 converts image data in the input color space (input image data) into image data in the color space for color adjustment via the virtual color space, and the image in the color space for color adjustment. A color profile may be adjusted for the data, and a link profile for converting the color-adjusted image data into image data in the output color space may be created. As a result, the color adjustment processing is also incorporated into the profile, and the same color adjustment processing can be repeated by simply applying this profile.

Specifically, the image processing program 5 uses a configuration of the adjustment data generation unit 500, the color adjustment processing unit 530, and the output data generation unit 540 illustrated in FIG. For example, 1331 RGB grid point data (corresponding to 11 grid points) when the respective RGB axes are equally divided into 10 are generated, and the generated RGB grid point data (RGB values) are converted into a virtual color space. The image data in the virtual color space is converted into the image data (Lab value) in the color space for color adjustment, and the color adjustment processing is performed on the image data (Lab value) in the color space for color adjustment. The image data (Lab value) subjected to the color adjustment process is converted into image data (CMYK value) in the output color space.
Next, the image processing program 5 generates a prediction model for predicting the CMYK value from the RGB value based on the RGB grid point and the corresponding CMYK value (image data in the output color space). For example, since the image processing program 5 has a plurality of pairs of RGB values and CMYK values (CMYK values subjected to color gamut compression processing and color adjustment processing), a prediction model using a method such as a regression method or a neural network is used. Is generated.
Then, the image processing program 5 converts the RGB value included in the image data to be processed into image data for output (CMYK value) using the generated prediction model (that is, link profile). The output image data converted using this prediction model is data that has been subjected to color gamut compression processing corresponding to the virtual color space and color adjustment processing restricted within the color reproduction range of the virtual color space. It becomes.

1 is a diagram illustrating an overall configuration of an image processing system 1. FIG. 1 is a diagram illustrating a configuration of a tandem type printer device 10. FIG. FIG. 2 is a diagram illustrating a hardware configuration of a client PC 4 to which an image processing method according to the present invention is applied, centering on a control device 40; It is a figure which illustrates functional composition of image processing program 5 which is executed by client PC4 (Drawing 1 and Drawing 3), and realizes an image processing method concerning the present invention. 6 is a flowchart illustrating an operation of a printing process (S10) in the image processing system 1. It is a flowchart explaining the operation | movement of a printing process (S20) when a color adjustment process is made in CMYK color space.

Explanation of symbols

4 ... Client PC
DESCRIPTION OF SYMBOLS 5 ... Image processing program 500 ... Adjustment data generation part 510 ... RGB / virtual conversion part 520 ... Virtual / Lab conversion part 530 ... Color adjustment processing part 540 ... Output data generation 550... Lab / CMYK converter 560... CMYK converter 10.

Claims (7)

Color gamut compression means for performing color gamut compression corresponding to a color reproduction gamut including a plurality of image output reproduction gamuts for input image data;
An image processing apparatus comprising: color adjustment means for performing color adjustment on image data that has been subjected to color gamut compression by the color gamut compression means. The image processing apparatus according to claim 1, wherein the color gamut compression unit performs color gamut compression corresponding to one image output reproduction area among a plurality of image output reproduction areas. The image processing apparatus according to claim 1, wherein the color adjustment unit performs a color adjustment process only within the color gamut. First color conversion means for converting input image data into image data in a virtual color space having a predetermined color reproduction range;
Second color conversion means for converting the image data of the virtual color space converted by the first color conversion means into image data of an adjustment color space for performing color adjustment;
An image processing apparatus comprising: color adjustment means for performing color adjustment on the image data in the adjustment color space converted by the second color conversion means. Color conversion means for converting input image data into image data for color adjustment using a color conversion formula corresponding to a predetermined color reproduction range;
An image processing apparatus comprising: color adjustment means for performing color adjustment on the image data for color adjustment converted by the color conversion means. Performs color gamut compression according to the default color gamut for the input image data,
An image processing method for performing color adjustment on image data subjected to color gamut compression. In an image processing apparatus including a computer,
Performing color gamut compression on the input image data in accordance with a predetermined color gamut;
A program for causing a computer of the image processing apparatus to execute a step of performing color adjustment on image data subjected to color gamut compression.

Images