Output image color consistency calibration method and device, equipment and storage medium

Abstract

The invention discloses an output image color consistency calibration method and device, equipment and a storage medium, and relates to the technical field of ink-jet printing. According to the method, a first image output device and a second image device are controlled to output preset color target electronic files to obtain a first output color target and a second output color target, and corresponding first color data and second color data are obtained; acquiring a color calibration file according to the first color data and the second color data; and enabling a second image output device to output an image with the color consistent with that of the first output image by using the color calibration file. According to the method, the first image output device and the second image output device do not need to be respectively calibrated by using international color management standards, and color consistency processing of the two image output devices can be realized only by calibrating one of the first image output device and the second image output device, so that the method is simple and convenient; and the color gamut of the image output equipment cannot be compressed, and the color consistency output range and effect are better.

Description

Technical Field

[0001] The present invention relates to the field of inkjet printing technology, and in particular to a method, device, equipment and storage medium for calibrating the color consistency of an output image. Background Art

[0002] In industries such as digital printing and traditional printing, in order to ensure the output color effect of image output devices such as printers and display screens, it is necessary to perform color management on the image output devices to control the overall output color effect of the image output devices. When the output colors of one or more image output devices are required to be consistent, color calibration or color tracking between devices is required accordingly. For example, in the digital printing industry, a screen or display is used to simulate the actual printing output effect of a sample image. If the color difference between the screen display effect and the actual printed sample image is large, the only way is to calibrate the screen first to make the screen conform to a certain international color management standard, and then calibrate the printing equipment to make the printing equipment conform to the same international color management standard, so that the color of the image displayed on the screen is consistent with the color of the sample image. However, this method will compress the color gamut of the image output device of the printing equipment, resulting in a smaller color output range and a worse effect. Summary of the invention

[0003] In view of this, embodiments of the present invention provide an output image color consistency calibration method, apparatus, device and storage medium to solve the problem of inconsistent output colors of multiple image output devices in the prior art.

[0004] In a first aspect, an embodiment of the present invention provides a method for calibrating color consistency of an output image, the method comprising:

[0005] Acquire color data of each color block in the preset color target electronic file and record it as preset color data;

[0006] Respectively controlling the first image output device and the second image device to output the preset color target electronic file to obtain a first output color target and a second output color target;

[0007] Control the color acquisition device to respectively acquire the color of each color block in the first output color target and the second output color target to obtain first color data and second color data;

[0008] acquiring a color calibration file according to the preset color data, the first color data, and the second color data;

[0009] Sending the sample image electronic file to a first image output device to output a first output image;

[0010] Acquire calibration color data corresponding to each color data in the first output image according to the color calibration file;

[0011] The second image output device is controlled to output a second output image having the same color as the first output image according to the calibration color data.

[0012] Preferably, the preset color target electronic file includes N color blocks with different color values, wherein N is a natural number greater than or equal to 1.

[0013] Preferably, the preset color data is RGB or CMYK color data, and the first color data and the second color data are any one of RGB data, CMYK data, Lab data, XYZ data, spectrum data, and color density data.

[0014] Preferably, acquiring a color calibration file according to the preset color data, the first color data and the second color data comprises:

[0015] Establishing a mapping relationship between the preset color data and the first color data to obtain a first color lookup table;

[0016] Establishing a mapping relationship between the preset color data and the second color data to obtain a second color lookup table;

[0017] The color calibration file is acquired according to the first color lookup table and the second color lookup table.

[0018] Preferably, acquiring calibration color data corresponding to each color data in the first output image according to the color calibration file comprises:

[0019] Acquire color data in the first output image, recorded as first output color data;

[0020] Acquire a calibration value corresponding to the first output color data according to the color calibration file, and record it as first search color data;

[0021] The lookup value of the first lookup color data in the second color lookup table is obtained, which is the calibration color data.

[0022] Preferably, the first image output device and the second image output device are any one of projection devices, electronic display devices, digital inkjet printing devices, lithographic printing devices, gravure printing devices, letterpress printing devices, and stencil printing devices.

[0023] Preferably, the color acquisition device is any one of a spectrophotometer, a video camera, a scanner, and a camera.

[0024] In a second aspect, an embodiment of the present invention provides an output image color consistency calibration device, the device comprising:

[0025] A preset color data acquisition module, used to acquire color data of each color block in a preset color target electronic file, recorded as preset color data;

[0026] A first output module, used to control the first image output device and the second image device to output the preset color target electronic file to obtain a first output color target and a second output color target;

[0027] An acquisition module, used for controlling the color acquisition device to respectively acquire the color of each color block in the first output color target and the second output color target to obtain first color data and second color data;

[0028] A color calibration file acquisition module, configured to acquire a color calibration file according to the preset color data, the first color data, and the second color data;

[0029] A second output module, used for sending the electronic file of the sample image to the first image output device to output a first output image;

[0030] A calibration module, configured to obtain calibration color data corresponding to each color data in the first output image according to the color calibration file;

[0031] The third output module is used to control the second image output device to output a second output image having the same color as the first output image according to the calibration color data.

[0032] In a third aspect, an embodiment of the present invention provides an output image color consistency calibration device, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, and when the computer program instructions are executed by the processor, the method of the first aspect in the above embodiment is implemented.

[0033] In a fourth aspect, an embodiment of the present invention provides a storage medium having computer program instructions stored thereon, which implements the method of the first aspect in the above-mentioned embodiment when the computer program instructions are executed by a processor.

[0034] In summary, the beneficial effects of the present invention are as follows:

[0035] The output image color consistency calibration method, device, equipment and storage medium provided by the embodiment of the present invention obtains the first output color target and the second output color target by controlling the first image output device and the second image device to output electronic files of preset color targets respectively to obtain the first output color target and the second output color target to obtain the corresponding first color data and second color data; obtains the color calibration file according to the first color data and the second color data; and uses the color calibration file to make the second image output device output an image with the same color as the first output image. The method does not need to use the international color management standard to calibrate the first image output device and the second image output device respectively, but only needs to calibrate one of the first image output device and the second image output device to achieve color consistency processing of the two image output devices. It is simple and convenient, and will not compress the color gamut of the image output device, and the color consistency output range and effect are better. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0037] Figure 1 Schematic diagram of a preset color target electronic file according to an embodiment of the present invention.

[0038] Figure 2 4 is a flow chart of a method for calibrating color consistency of an output image according to an embodiment of the present invention.

[0039] Figure 3 Schematic diagram of the structure of the output image color consistency calibration device according to an embodiment of the present invention.

[0040] Figure 4 Schematic diagram of the structure of an output image color consistency calibration device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0043] Embodiment 1

[0044] See also Figure 1 , an embodiment of the present invention provides a method for calibrating the color consistency of an output image, the method comprising:

[0045] S1: Obtain color data of each color block in the preset color target electronic file and record it as preset color data;

[0046] S2: respectively controlling the first image output device and the second image device to output the preset color target electronic file to obtain a first output color target and a second output color target;

[0047] S3: controlling the color acquisition device to respectively acquire the color of each color block in the first output color target and the second output color target to obtain first color data and second color data;

[0048] S4: acquiring a color calibration file according to the preset color data, the first color data and the second color data;

[0049] S5: sending the electronic file of the sample image to a first image output device to output a first output image;

[0050] S6: acquiring calibration color data corresponding to each color data in the first output image according to the color calibration file;

[0051] S7: Control the second image output device to output a second output image having the same color as the first output image according to the calibrated color data.

[0052] Specifically, the preset color target electronic file can be a color image electronic file containing multiple specific color blocks constructed by the user according to actual application conditions. Preferably, the color values ​​of the color blocks are different. The color values ​​of the color blocks can be set as RGB values ​​or CMYK values. For example, Figure 2As shown, the preset color target electronic file contains multiple color blocks with different color values, preferably, the color values ​​of each color block are different. In one embodiment, R value, G value and B value are selected from 0-255 at intervals of 15, that is, R = {0, 15, 30, ..., 255}, G = {0, 15, 30, ..., 255}, B = {0, 15, 30, ..., 255}, and the R value, B value and G value are arranged and combined to obtain 5832 color values, and the corresponding color blocks are generated according to the 5832 color values ​​to obtain the preset color target electronic file. In other embodiments, R value, G value and B value can also be selected at intervals of 1, 2, 5, 10, etc., and the color values ​​are arranged and combined to obtain the corresponding color blocks to form the preset color target electronic file. For example, R, G and B values ​​are selected from 0-255 at intervals of 1, that is, R = {0, 1, 2, ..., 255}, G = {0, 1, 2, ..., 255}, B = {0, 1, 2, ..., 255}, and the R, B and G values ​​are arranged and combined to obtain 256 3 color values ​​and generate corresponding color blocks to obtain the preset color target electronic file.

[0053] In other embodiments, the C value, M value, Y value and K value in the CMYK four-color channel can be selected at intervals of 1, 2, 3, 5, 10, etc., and the color values ​​can be arranged and combined to obtain the corresponding color blocks to form a preset color target electronic file. Exemplarily, the C value, M value, Y value and K value are selected at intervals of 1 from 0-100, that is, C={0, 1, 2, ..., 100}, M={0, 1, 2, ..., 100}, Y={0, 1, 2, ..., 100}, K={0, 1, 2, ..., 100}, and the CMYK values ​​are arranged and combined to obtain a color block composed of 101 4 A preset color target electronic file consisting of color blocks with different color values.

[0054] In other embodiments, in addition to the CMYK four-color channels, the digital printing presses used in the digital printing industry will also be provided with several spot color channels for printing spot color inks. Therefore, the C value, M value, Y value, and K value in the CMYK four-color channels can be selected at intervals of 1, 2, 3, 5, 10, and the color value arrangement and combination of the spot color channels can be used to obtain the corresponding color blocks to form a preset color target electronic file. Exemplarily, if the printing press also includes a spot color channel P, the C value, M value, Y value, K value, and P value are selected at intervals of 2 from 0-100, that is, C={0, 2, 4, ..., 100}, M={0, 2, 4, ..., 100}, Y={0, 2, 4, ..., 100}, K={0, 2, 4, ..., 100}, P={0, 2, 4, ..., 100}, and the CMYKP values ​​are arranged and combined to obtain the color target electronic file composed of 51 5 An electronic file of a preset color target consisting of 3 color blocks.

[0055] After obtaining the preset color target electronic file, the first image output device and the second image output device are controlled to output the preset color target electronic file to the image object respectively. The first image output device and the second image device here are any one of electronic display devices with display screens such as digital printing equipment, lithographic printing equipment, gravure printing equipment, letterpress printing equipment, stencil printing equipment, projectors, monitors, mobile phones, tablet computers, laptop computers, etc. Preferably, the first image output device and the second image output device are different types of devices. When the image output device is a printing device, the image object is a medium such as paper, cloth, glass, etc., when the image output device is a projector, the image object is a projection screen, and when the image output device is an electronic device with a display screen, the image object is the display screen of the electronic device. Control the first image output device and the second image output device to output the preset color target electronic file to the image object respectively to obtain the first output color target and the second output color target.

[0056] In one embodiment, a spectrophotometer is used to collect color data of each color block in a first output color target on an image object to obtain first color data, and the first color data may be any one of Lab data, XYZ data, spectral data, and color density data. Preferably, the first color data is Lab data. Similarly, a spectrophotometer is used to collect color data of each color block in a second output color target to obtain second color data, and the second color data may be any one of Lab data, XYZ data, spectral data, and color density. Preferably, the second color data is Lab data, and is the same type of data as the first color data, such as both are Lab data, or both are spectral data.

[0057] In another embodiment, a digital image acquisition device such as a scanner, a camera or a still camera is used to scan or photograph the images of the first output color target and the second output color target on the image object to obtain the first acquired electronic image and the second acquired electronic image, and image processing software such as PS is used to directly obtain the color values ​​of each color block in the first acquired electronic image and the second acquired electronic image to obtain the first color data and the second color data. At this time, the first color data and the second color data are RGB data or CMYK data.

[0058] Preferably, acquiring a color calibration file according to the preset color data, the first color data and the second color data comprises:

[0059] Establishing a mapping relationship between the preset color data and the first color data to obtain a first color lookup table;

[0060] Establishing a mapping relationship between the preset color data and the second color data to obtain a second color lookup table;

[0061] The color calibration file is acquired according to the first color lookup table and the second color lookup table.

[0062] Because the color value of each color block in the preset color target electronic file is known, the set of color values ​​of each color block is recorded as preset color data. In other embodiments, the color value of each color block in the preset color target electronic file can be obtained by using image processing software (such as PS, RIP software) in the host computer to obtain the preset color data. The preset color data is RGB data or CMYK data.

[0063] Since the first output color target is obtained based on outputting the preset color target electronic file using the first image output device, the first color data of each color block in the first output color target is collected using a color acquisition device such as a spectrophotometer, a scanner, or a camera (when the color acquisition device is a spectrophotometer, the first color data is Lab data, XYZ data, spectral data, or color density data; when the color acquisition device is a scanner or a camera, the first color data is RGB data or CMYK data), and there is a one-to-one mapping relationship between the preset color data and the first color data.

[0064] In one embodiment, the preset color data is RGB data, denoted as RGB0, and the first color data is Lab data collected by a spectrophotometer, denoted as Lab1. A mapping relationship between the preset color data and the first color data is established to obtain a first color lookup table (RGB0<->Lab1), wherein the first color lookup table includes a first forward lookup table (RGB0->Lab1) for mapping the preset color data to the first color data, and a first reverse lookup table (Lab1->RGB0) for mapping the first color data to the preset color data. Similarly, the second output color target is obtained based on outputting the preset color target electronic file using a second image output device, and the first color data of each color block in the first output color target is collected using a spectrophotometer or a color collection device such as a scanner or a camera (when the color collection device is a spectrophotometer, the first color data is Lab data, XYZ data, spectral data or color density data, and when the color collection device is a scanner or a camera, the first color data is RGB data or CMYK data). Similarly, the preset color data is RGB data, denoted as RGB0, and the second color data is Lab data collected based on the spectrophotometer, denoted as Lab2. A mapping relationship between the preset color data and the second color data is established to generate a second color lookup table (RGB0<->Lab2). The second color lookup table includes a second forward lookup table (RGB0->Lab2) for mapping the preset color data to the second color data, and a second reverse lookup table (Lab2->RGB0) for mapping the second color data to the preset color data. A mapping relationship Lab1<->RGB0<->Lab2 is established between the first color lookup table and the second color lookup table to obtain a mapping relationship of Lab1<->Lab2. Furthermore, the mapping relationship can be interpolated to obtain a color calibration file.

[0065] In another embodiment, the preset color data is RGB data, recorded as RGB0, the first color data is RGB data collected by a scanner or camera, recorded as RGB1, a mapping relationship between the preset color data and the first color data is established, and a first color lookup table (RGB0<->RGB1) is obtained, wherein the first color lookup table includes a first forward lookup table (RGB0->RGB1) from which the preset color data is mapped to the first color data, and a first reverse lookup table (RGB1->RGB0) from the first color data to the preset color data. Similarly, the second color data is RGB data collected by a scanner or camera, recorded as RGB2, a mapping relationship between the preset color data and the second color data is established, and a second color lookup table (RGB0<->RGB2) is generated. The second color lookup table includes a second forward lookup table (RGB0->RGB2) from which the preset color data is mapped to the second color data, and a second reverse lookup table (RGB2->RGB0) from the second color data to the preset color data. A mapping relationship RGB1<->RGB0<->RGB2 is established between the first color lookup table and the second color lookup table to obtain a mapping relationship of RGB1<->RGB2. Furthermore, the mapping relationship may be interpolated to obtain a color calibration file.

[0066] When the customer provides a sample image, a scanner or other image acquisition device is used to acquire the sample image to obtain an electronic file of the sample image, a first image output device is used to output a first output image based on the electronic file of the sample image, and a second image output device is used to output a second output image based on the electronic file of the sample image. Because the difference in devices or states between the two may cause a difference in color between the outputted first output image and the second output image, if it is desired that the second output image outputted by the second image output device based on the electronic file of the sample image be consistent in color with the first output image, it is necessary to calibrate the output color of the second image output device based on the output color effect of the first image output device and use a color calibration file to ensure that the colors of the images outputted by the two devices are consistent.

[0067] Preferably, the calibration color data corresponding to each color data in the first output image is obtained according to the color calibration file:

[0068] Acquire color data in the first output image, recorded as first output color data;

[0069] Acquire a calibration value corresponding to the first output color data according to the color calibration file, and record it as first search color data;

[0070] The lookup value of the first lookup color data in the second color lookup table is obtained, which is the calibration color data.

[0071] Specifically, the color data of each color in the first output image is obtained, which is recorded as the first output color data. The first output color data can be obtained by a spectrophotometer or by a scanner or other equipment. When the first output color data is a Lab data value, the mapping value or calibration value corresponding to the first output color data is obtained through the forward mapping relationship Lab1->Lab2 in the color calibration file (Lab1<->Lab2), which is recorded as the first search color data. Then, the first search color data is substituted into the second reverse search table (Lab2->RGB0) of the second color search table to obtain its corresponding search value, which is recorded as the calibration color data.

[0072] Similarly, when the first output color data is an RGB data value, the mapping value or calibration value corresponding to the first output color data is obtained through the forward mapping relationship RGB1->RGB2 in the color calibration file (RGB1<->RGB), which is recorded as the first lookup color data. Then, the first lookup color data is substituted into the second reverse lookup table (RGB2->RGB0) of the second color lookup table to obtain its corresponding lookup value, which is recorded as the calibration color data.

[0073] After obtaining the calibration color data corresponding to the electronic file of the sample image, the calibration color data is used to control the second image output device to output a corresponding image, which is recorded as a second output image. The color of the second output image is consistent with the color of the first output image.

[0074] In summary, the output image color consistency calibration method of the embodiment of the present invention controls the first image output device and the second image device to output respectively preset color target electronic files to obtain the first output color target and the second output color target to obtain the corresponding first color data and second color data; obtains a color calibration file according to the first color data and the second color data; and uses the color calibration file to make the second image output device output an image consistent with the color of the first output image. This method does not need to use the international color management standard to calibrate the first image output device and the second image output device respectively, but only needs to calibrate one of the first image output device and the second image output device to achieve color consistency processing of the two image output devices. It is simple and convenient, and will not compress the color gamut of the image output device, and the color consistency output range and effect are better.

[0075] Embodiment 2

[0076] In some practical applications, before printing an image, a display is used to simulate the actual printing output effect of the image, and printing is performed if the output effect meets the requirements. In the second embodiment of the present invention, the first image output device is a printing device, and the second image output device is a display.

[0077] The output image color consistency calibration method comprises:

[0078] Acquire color data of each color block in the preset color target electronic file and record it as preset color data;

[0079] Controlling the printing device and the display to output the preset color target electronic file to obtain a first output color target and a second output color target respectively;

[0080] Control the color acquisition device to respectively acquire the color of each color block in the first output color target and the second output color target to obtain first color data and second color data;

[0081] acquiring a color calibration file according to the preset color data, the first color data, and the second color data;

[0082] Sending the electronic file of the sample image to a printing device to output a first output image;

[0083] Acquire calibration color data corresponding to each color data in the first output image according to the color calibration file;

[0084] An image having a color consistent with the first output image is outputted in the display according to the calibration color data.

[0085] The preset color target electronic file of this embodiment is as described in the first embodiment. The preset color target electronic file is sent to the printing device to print on the substrate to obtain the first output color target; the preset color target electronic file is sent to the display, and the display screen outputs the second output color target. The first output color target and the second output color target are collected and measured using a spectrophotometer or a scanner, a camera, etc. to obtain the first color data and the second color data. According to the preset color data, the first color data and the second color data, the first color lookup table, the second color lookup table and the color calibration file are obtained to obtain the color data of each color in the first output image, which is recorded as the first output color data. When the first output color data is a Lab data value, the mapping value or calibration value corresponding to the first output color data is obtained through the forward mapping relationship Lab1->Lab2 in the color calibration file (Lab1<->Lab2), which is recorded as the first lookup color data, and then, the first lookup color data is substituted into the second reverse lookup table (Lab2->RGB0) of the second color lookup table to obtain its corresponding lookup value, which is recorded as the calibration color data. If the first output color data is an RGB data value, the mapping value or calibration value corresponding to the first output color data is obtained through the forward mapping relationship RGB1->RGB2 in the color calibration file (RGB1<->RGB), which is recorded as the first lookup color data. Then, the first lookup color data is substituted into the second reverse lookup table (RGB2->RGB0) of the second color lookup table to obtain its corresponding lookup value, which is recorded as the calibration color data.

[0086] After obtaining the calibration color data corresponding to the electronic file of the sample image, a corresponding image is output on the display according to the calibration color data, which is recorded as the second output image, and the color of the second output image is consistent with the color of the first output image. The specific process of obtaining the first color lookup table, the second color lookup table and the color calibration file is the same as that described in the first embodiment, and will not be repeated here.

[0087] In other embodiments, the first image output device may be a printing device and the second image output device may be a projector; or the first image output device may be a display and the second image output device may be a projector; or the first image output device may be a printing device and the second image output device may be a mobile phone, a tablet computer, etc. By using this output color consistency processing method, the colors of images output by various image output devices in the same region may be made consistent, and the colors of images output by various image output devices in different regions may be made consistent, thereby getting rid of the geographical location restrictions and achieving color consistency of multiple types of remote image output devices. Exemplarily, this method may be used to make the colors of images printed and output by a printing device in place A, images displayed and output by a display in place B, and images projected and output by a projector in place C consistent, thereby achieving remote sample color confirmation.

[0088] Embodiment 3

[0089] Based on the above-mentioned embodiments 1 and 2, this embodiment 3 provides a method for making a color card. Specifically, some color blocks are selected from the preset color target electronic file described in the above-mentioned embodiments 1 or 2, the color values ​​of these color blocks are obtained, and color number names are respectively assigned to these color blocks. On the one hand, an electronic color card is made according to these color blocks and their color number names, and the electronic color card is input into a display for display (at this time, the display is a first image output device); on the other hand, the corresponding color data in the electronic color card is calibrated according to the color calibration file to obtain calibrated color data, and the corresponding physical color card is printed according to the calibrated color data. At this time, the color displayed on the electronic color card on the display is consistent with the color of the physical color card.

[0090] Embodiment 4

[0091] See also Figure 3 The embodiment of the present invention provides an output image color consistency calibration device 200, the device 200 comprising:

[0092] The preset color data acquisition module 201 is used to acquire the color data of each color block in the preset color target electronic file, which is recorded as preset color data;

[0093] The first output module 202 is used to control the first image output device and the second image device to output the preset color target electronic file to obtain a first output color target and a second output color target;

[0094] The acquisition module 203 is used to control the color acquisition device to respectively acquire the color of each color block in the first output color target and the second output color target to obtain first color data and second color data;

[0095] A color calibration file acquisition module 204, configured to acquire a color calibration file according to the preset color data, the first color data, and the second color data;

[0096] The second output module 205 is used to send the electronic file of the sample image to the first image output device to output a first output image;

[0097] A calibration module 206, configured to obtain calibration color data corresponding to each color data in the first output image according to the color calibration file;

[0098] The third output module 207 is used to control the second image output device to output a second output image having the same color as the first output image according to the calibrated color data.

[0099] Preferably, the color calibration file acquisition module 204 includes:

[0100] A first color lookup table acquisition unit, configured to establish a mapping relationship between the preset color data and the first color data to obtain a first color lookup table;

[0101] A second color lookup table acquisition unit, configured to establish a mapping relationship between the preset color data and the second color data to obtain a second color lookup table;

[0102] The color calibration file acquiring unit is configured to acquire the color calibration file according to the first color lookup table and the second color lookup table.

[0103] Preferably, the calibration module 206 includes:

[0104] A first output color data acquisition unit, used to acquire color data in a first output image, recorded as first output color data;

[0105] A first search unit, configured to obtain a calibration value corresponding to the first output color data according to the color calibration file, recorded as first search color data;

[0106] The second search unit obtains a search value of the first search color data in the second color lookup table, which is the calibration color data.

[0107] In summary, the output image color consistency calibration device provided by the embodiment of the present invention obtains the first output color target and the second output color target by controlling the first image output device and the second image device to output the respective preset color target electronic files to obtain the first output color target and the second output color target to obtain the corresponding first color data and second color data; obtains the color calibration file according to the first color data and the second color data; and uses the color calibration file to make the second image output device output an image consistent with the color of the first output image. This method does not need to use the international color management standard to calibrate the first image output device and the second image output device respectively, but only needs to calibrate one of the first image output device and the second image output device to achieve the color consistency processing of the two image output devices, which is simple and convenient, and does not compress the color gamut of the image output device, and the color consistency output range and effect are better.

[0108] Embodiment 5

[0109] In addition, the output image color consistency calibration method of the embodiment of the present invention can be implemented by an output image color consistency calibration device. Figure 4 A schematic diagram of the hardware structure of an output image color consistency calibration device provided by an embodiment of the present invention is shown.

[0110] The output image color consistency calibration device may include a processor 301 and a memory 302 storing computer program instructions.

[0111] Specifically, the processor 301 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present invention.

[0112] Memory 302 may include a large capacity memory for data or instructions. For example, but not limitation, memory 302 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, memory 302 may include a removable or non-removable (or fixed) medium. In appropriate cases, memory 302 may be inside or outside a data processing device. In a specific embodiment, memory 302 is a non-volatile solid-state memory. In a specific embodiment, memory 302 includes a read-only memory (ROM). In appropriate cases, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0113] The processor 301 reads and executes the computer program instructions stored in the memory 302 to implement any one of the output image color consistency calibration methods in the above embodiments.

[0114] In one example, the output image color consistency calibration device may further include a communication interface 303 and a bus 310. Figure 4 As shown, the processor 301, the memory 302, and the communication interface 303 are connected via a bus 310 and communicate with each other.

[0115] The communication interface 303 is mainly used to implement the communication between the modules, devices, units and / or equipment in the embodiment of the present invention.

[0116] Bus 310 includes hardware, software or both, and couples the components of the output image color consistency calibration device to each other. For example, but not limitation, bus 310 may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-side bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnect (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. Where appropriate, bus 310 may include one or more buses. Although the embodiments of the present invention describe and illustrate specific buses, the present invention considers any suitable bus or interconnection.

[0117] Embodiment 6

[0118] In addition, in combination with the output image color consistency calibration method in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by the processor 301, any one of the output image color consistency calibration methods in the above embodiment is implemented.

[0119] In summary, the output image color consistency calibration method, device, equipment and storage medium provided by the embodiments of the present invention obtain the first output color target and the second output color target by controlling the first image output device and the second image device to output electronic files of preset color targets respectively to obtain the first output color target and the second output color target to obtain the corresponding first color data and second color data; obtain the color calibration file according to the first color data and the second color data; and use the color calibration file to make the second image output device output an image with the same color as the first output image. This method does not need to use the international color management standard to calibrate the first image output device and the second image output device respectively, but only needs to calibrate one of the first image output device and the second image output device to achieve color consistency processing of the two image output devices. It is simple and convenient, and will not compress the color gamut of the image output device, and the color consistency output range and effect are better.

[0120] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0121] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0122] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0123] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A method for calibrating the color consistency of an output image, characterized in that: The method comprises: Acquire color data of each color block in the preset color target electronic file and record it as preset color data; Respectively controlling the first image output device and the second image device to output the preset color target electronic file to obtain a first output color target and a second output color target; Control the color acquisition device to respectively acquire the color of each color block in the first output color target and the second output color target to obtain first color data and second color data; acquiring a color calibration file according to the preset color data, the first color data, and the second color data; Sending the sample image electronic file to a first image output device to output a first output image; Acquire calibration color data corresponding to each color data in the first output image according to the color calibration file; The second image output device is controlled to output a second output image having the same color as the first output image according to the calibration color data.

2. The method for calibrating the color consistency of an output image according to claim 1, characterized in that: The preset color target electronic file includes N color blocks with different color values, wherein N is a natural number greater than or equal to 1.

3. The method for calibrating the color consistency of an output image according to claim 1, characterized in that: The preset color data is RGB or CMYK color data, and the first color data and the second color data are any one of RGB data, CMYK data, Lab data, XYZ data, spectrum data, and color density data.

4. The method for calibrating the color consistency of an output image according to claim 1, characterized in that: The acquiring of a color calibration file according to the preset color data, the first color data and the second color data comprises: Establishing a mapping relationship between the preset color data and the first color data to obtain a first color lookup table; Establishing a mapping relationship between the preset color data and the second color data to obtain a second color lookup table; The color calibration file is acquired according to the first color lookup table and the second color lookup table.

5. The method for calibrating the color consistency of an output image according to claim 4, characterized in that: The acquiring, according to the color calibration file, calibrated color data corresponding to each color data in the first output image comprises: Acquire color data in the first output image, recorded as first output color data; Acquire a calibration value corresponding to the first output color data according to the color calibration file, and record it as first search color data; The lookup value of the first lookup color data in the second color lookup table is obtained, which is the calibration color data.

6. The method for calibrating the color consistency of an output image according to any one of claims 1 to 5, characterized in that: The first image output device and the second image output device are any one of a projection device, an electronic display device, a digital inkjet printing device, a lithographic printing device, a gravure printing device, a letterpress printing device, and a stencil printing device.

7. The method for calibrating the color consistency of an output image according to any one of claims 1 to 5, characterized in that: The color acquisition device is any one of a spectrophotometer, a video camera, a scanner, and a camera.

8. An output image color consistency calibration device, characterized in that: The device comprises: A preset color data acquisition module, used to acquire color data of each color block in a preset color target electronic file, recorded as preset color data; A first output module, used to control the first image output device and the second image device to output the preset color target electronic file to obtain a first output color target and a second output color target; An acquisition module, used for controlling the color acquisition device to respectively acquire the color of each color block in the first output color target and the second output color target to obtain first color data and second color data; A color calibration file acquisition module, configured to acquire a color calibration file according to the preset color data, the first color data, and the second color data; A second output module, used for sending the electronic file of the sample image to the first image output device to output a first output image; A calibration module, configured to obtain calibration color data corresponding to each color data in the first output image according to the color calibration file; The third output module is used to control the second image output device to output a second output image having the same color as the first output image according to the calibration color data.

9. An output image color consistency calibration device, characterized in that: include: At least one processor, at least one memory and computer program instructions stored in the memory, when the computer program instructions are executed by the processor, implement the method according to any one of claims 1 to 7.

10. A storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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