CN108958674B - Ink-jet printer color-tracing method, system, storage medium and color-tracing equipment - Google Patents

Ink-jet printer color-tracing method, system, storage medium and color-tracing equipment Download PDF

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CN108958674B
CN108958674B CN201810783535.9A CN201810783535A CN108958674B CN 108958674 B CN108958674 B CN 108958674B CN 201810783535 A CN201810783535 A CN 201810783535A CN 108958674 B CN108958674 B CN 108958674B
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color
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CN108958674A (en
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郭剑慧
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Wuhan Maintop Technology Development Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12—Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201—Dedicated interfaces to print systems
    • G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
    • G06F3/1203—Improving or facilitating administration, e.g. print management
    • G06F3/1204—Improving or facilitating administration, e.g. print management resulting in reduced user or operator actions, e.g. presetting, automatic actions, using hardware token storing data
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12—Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201—Dedicated interfaces to print systems
    • G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
    • G06F3/1203—Improving or facilitating administration, e.g. print management
    • G06F3/1208—Improving or facilitating administration, e.g. print management resulting in improved quality of the output result, e.g. print layout, colours, workflows, print preview
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12—Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201—Dedicated interfaces to print systems
    • G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
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Abstract

The invention relates to a method and a system for tracing colors of an ink-jet printer, a storage medium and a device for tracing colors, wherein the method comprises the steps of respectively acquiring spectral data of a target printer and spectral data of a tracing printer in original printing states, and preprocessing the spectral data; generating a color tracing lookup table of a color tracing printer according to the preprocessed spectral data; and controlling the color tracing printer to print the target picture according to the color tracing lookup table. According to the color-chasing method of the ink-jet printer, the spectral data of the original states of the target printer and the color-chasing printer are obtained and preprocessed, then the color-chasing lookup table of the color-chasing printer is established according to the preprocessed spectral data of the original states, and the target picture is printed according to the color-chasing lookup table of the color-chasing printer, so that automatic and efficient color chasing of the ink-jet printer is achieved, dependence on a qualified color matching person is avoided, the operation is simple, the cost is saved, the color-chasing chromatic aberration is small, and the restoring effect on the gray level image is good.

Description

Ink-jet printer color-tracing method, system, storage medium and color-tracing equipment
Technical Field
The invention relates to the technical field of printing, in particular to a color tracing method and system for an ink jet printer, a storage medium and color tracing equipment.
Background
The ink-jet printer has wide application in the fields of outdoor advertising, label printing, textile printing, ceramic printing, printing electronics, home decoration and the like. In mass production in industry, it is generally required that a plurality of printers print a sample sheet having a uniform color, and that the color printed after a certain period of use is uniform with the color of the printed sample sheet determined before. The state of a general printer is not stable, and is usually affected by factors such as ambient temperature, humidity, and aging of a nozzle, and the color of a printed sample sheet is changed to different degrees by replacing ink and paper. How to ensure that a plurality of printers can print consistent colors in different time periods is a key problem which needs to be urgently solved in the current industrial production. At present, the following methods are commonly used for realizing color matching:
(1) the color corrector repeatedly tries different ink amount ratios according to the printing result, and the color checking and adjusting personnel needs to spend a great deal of time and energy to adjust the ink amount curve of the printer;
(2) the method is only suitable for the condition of small production capacity, if a large number of pictures need to be printed, workers need to process each picture of each printer, and the workload is huge;
(3) the link characteristic file is generated by adopting the characteristic file of the printer, although the operation method is simple, the color cast problem exists to a certain extent, the reduction effect on the gray scale is not ideal, and the link characteristic file is difficult to popularize and apply in actual production.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method, a system, a storage medium and a device for color matching of an inkjet printer, which can realize automatic and efficient color matching of the inkjet printer by establishing a look-up table for each printer according to spectral data of a target picture of the printer.
The technical scheme for solving the technical problems is as follows: a color-tracing method for an ink-jet printer,
step 1: respectively acquiring original state spectral data printed by a target printer and a color tracing printer, and preprocessing the spectral data;
step 2: generating a color tracing lookup table of a color tracing printer according to the preprocessed spectral data;
and step 3: and controlling a color tracing printer to print the target picture according to the color tracing lookup table.
The invention has the beneficial effects that: the spectral data of the original states of the target printer and the color-tracing printer are obtained and preprocessed, then the color-tracing lookup table of the color-tracing printer is established according to the preprocessed spectral data of the original states, and the target picture is printed according to the color-tracing lookup table of the color-tracing printer, so that the automatic and efficient color-tracing of the ink-jet printer is realized, the dependence on the personnel for adjusting the color according to the standard is avoided, the operation is simple, the cost is saved, the color difference of the color-tracing is small, and the restoring effect on the gray scale image is good.
On the basis of the technical scheme, the invention can be further improved as follows:
further: the step 1 specifically comprises:
step 11: respectively measuring the spectral data of original color block images of target images printed by a target printer and a color tracing printer by using a light intensity meter;
step 12: converting the spectral data into a Lab value corresponding to a Lab space, and generating Lab space data corresponding to a target printer and Lab space data corresponding to a color tracing printer;
step 13: and respectively smoothing the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer.
The beneficial effects of the further scheme are as follows: the photometric gradiometer can accurately measure the spectral data of original color patch images printed by a target printer and a color tracing printer, then convert the spectral data into a Lab space to generate Lab space data corresponding to the target printer and Lab space data corresponding to the color tracing printer, and then perform smoothing treatment to obtain corresponding relatively accurate Lab space data, so that a corresponding first color lookup table can be conveniently generated according to the Lab space data.
Further: the step 2 specifically comprises:
step 21: respectively generating a first color lookup table of the target printer and a first color lookup table of the color tracing printer according to the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer after the smoothing processing;
step 22: performing color gamut conversion processing on a first color lookup table of a target printer to generate a second color lookup table of the target printer;
step 23: carrying out gray scale invariant processing on the second color lookup table of the target printer to obtain a third color lookup table of the target printer;
step 24: and generating a color-following lookup table of the color-following printer according to the third color lookup table of the target printer and the first lookup table of the color-following printer.
The beneficial effects of the further scheme are as follows: the first color lookup tables of the target printer and the color tracing printer can be obtained correspondingly through the Lab space data corresponding to the smoothed target printer and the Lab space data corresponding to the color tracing printer, the spectral data can be converted from one color space to the other color space, color tracing can be achieved conveniently through conversion of different color spaces, and the color of the target picture is restored.
Further: the specific implementation of step 21 is:
performing interpolation processing on the preprocessed Lab spatial data corresponding to the target printer and the preprocessed Lab spatial data corresponding to the color tracing printer respectively to obtain a first color lookup table of the target printer and a first color lookup table of the color tracing printer;
the first color lookup table of the target printer comprises a forward lookup table obtained by respectively performing forward interpolation processing and reverse interpolation processing on Lab space data corresponding to the target printer
Figure BDA0001733175770000031
And a reverse look-up table
Figure BDA0001733175770000032
The first color lookup table of the color-tracing printer comprises a forward lookup table obtained by respectively carrying out forward interpolation processing and reverse interpolation processing on Lab space data corresponding to the color-tracing printer
Figure BDA0001733175770000041
And a reverse look-up table
Figure BDA0001733175770000042
The beneficial effects of the further scheme are as follows: interpolation processing is respectively carried out on Lab spatial data corresponding to a target printer and Lab spatial data corresponding to a color tracing printer, so that a first color lookup table of the target printer and a first color lookup table of the color tracing printer can be obtained; therefore, mutual mapping between the Lab space value of the spectral data and the ink amount value of the target printer or the color tracing printer is realized, and different color space conversion is conveniently realized.
Further: the step 22 specifically includes:
step 221: for target printersReverse lookup table
Figure BDA0001733175770000043
Sampling and acquiring an ink amount value output by a target printer corresponding to a Lab value of the target picture in a Lab space;
step 222: forward lookup table for target printer with ink amount value output by target printer as input
Figure BDA0001733175770000044
Performing interpolation to obtain a Lab value output by the target printer;
step 223: generating a second color lookup table Lut of the target printer according to the Lab value of each pixel of the target picture in the Lab space and the corresponding Lab value output by the target printer1。
The beneficial effects of the further scheme are as follows: by reverse look-up tables for the target printer
Figure BDA0001733175770000045
Sampling processing is carried out, and the sampling result is taken as input to a forward lookup table of the target printer
Figure BDA0001733175770000046
Interpolating, and generating a second color lookup table Lut of the target printer according to the Lab value of each pixel of the target picture in the Lab space and the corresponding Lab value output by the target printer1Thus, through two times of color conversion, the conversion from the target picture color gamut to the target printer color gamut is realized.
Further: the specific implementation of the step 23 is as follows:
step 231: look up table Lut according to the second color1Calculating saturation color difference delta E 'between input Lab value and gray color'ab；
Figure BDA0001733175770000047
Step 232: when saidSecond color lookup Table Lut1Input Lab value and saturation color difference Delta E 'of gray color'abWhen the set condition is met, the second color lookup table Lut is searched according to the following formula1The output Lab value is processed with unchanged gray scale to obtain a third color lookup table Lut of the target printer2；
Figure BDA0001733175770000051
a2＝a1
b2＝b1
The setting conditions are as follows:
ΔE′ab≤α
wherein, in Lab space, l represents brightness, and a and b represent chroma; the second color lookup table Lut1The input Lab value and the output Lab value of (l) are1,a1,b1) And (l)2,a2,b2)，lmaxAnd lminRespectively represent the second color look-up table Lut1Of the input Lab values of (1) is the maximum value and the minimum value of luminance, l'maxAnd l'minRespectively represent the second color look-up table Lut1And a represents the maximum and minimum values of the luminance among the output Lab values of (a) represents the second color lookup table Lut1And the input Lab value of (2) and the saturation color difference threshold of the gray color.
The beneficial effects of the further scheme are as follows: by calculating a second color look-up table Lut1Inputting the saturation color difference delta E 'of the Lab value and the gray color'abAnd when a preset condition is met, look up the second color lookup table Lut1The output Lab value is processed with unchanged gray scale to obtain a third color lookup table Lut of the target printer2The gray level restoration of the target picture is accurately realized, and the efficient color tracking of the target picture is conveniently realized subsequently.
Further: the specific implementation of step 24 is:
step 241: inquiring the third color according to the Lab value of the spectral data corresponding to the target printerColor lookup table Lut2Acquiring an output Lab value corresponding to the target printer;
step 242: inquiring the reverse lookup table of the color-chasing printer according to the output Lab value of the target printer
Figure BDA0001733175770000052
And acquiring a corresponding ink value output by a color tracing printer, and generating a color tracing lookup table comprising the Lab value of each pixel in the target picture and the corresponding ink value output by the color tracing printer.
The beneficial effects of the further scheme are as follows: querying the third color lookup table Lut by the Lab value of the spectral data corresponding to the target printer2The corresponding output Lab value of the target printer can be accurately obtained, and thus, the reverse lookup table of the color-tracing printer is inquired according to the output Lab value of the target printer
Figure BDA0001733175770000053
The corresponding ink value output by the color tracing printer can be obtained, so that a color tracing lookup table is generated, the corresponding ink value output by the color tracing printer can be conveniently searched through the Lab value of each pixel in the target picture, and color tracing printing is completed.
Further: the step 3 specifically includes:
and inquiring the color-chasing lookup table according to the Lab value of each pixel in the target picture, acquiring a corresponding ink value output by the color-chasing printer of each pixel in the target picture, and controlling the color-chasing printer to finish printing the target picture.
The beneficial effects of the further scheme are as follows: the ink amount value output by the color tracing printer corresponding to the Lab value of each pixel in the target picture can be accurately inquired through the color tracing lookup table, so that the color tracing printer realizes color tracing printing according to the output ink amount value, and efficient color tracing is realized.
Further: the inkjet printer color matching method further comprises the following steps after the step 3:
and 4, step 4: obtaining a color-tracing patch image of the target picture printed by a color-tracing printerAnd the spectral data is compared with the spectral data of the original color block diagram of the target picture printed by the target printer, and if the difference value of the spectral data and the spectral data exceeds a preset error range, the reverse lookup table of the color chasing printer is updated according to the spectral data of the color chasing block diagram of the target picture printed by the color chasing printer
Figure BDA0001733175770000061
And returning to the step 22, and repeating the steps until the difference value of the two is within the preset error, and ending the color chasing process.
The beneficial effects of the further scheme are as follows: the spectral data of the color-tracing block diagram of the target picture printed by the color-tracing printer is compared with the spectral data of the original color block diagram of the target picture printed by the target printer, so that whether the difference value of the two is within a set range can be judged, and the circular color-tracing is carried out when the difference value of the two exceeds the set range until the difference value of the two is within the preset error, so that the satisfactory color-tracing effect is achieved.
Further: the reverse lookup table of the color-following printer is updated according to the spectral data of the color-following block diagram of the target picture printed by the color-following printer
Figure BDA0001733175770000062
The specific implementation of the method is as follows:
converting the spectral data of the color-tracing patch map of the target picture printed by the color-tracing printer into Lab space, generating corresponding Lab space data, and generating the forward lookup table of the color-tracing printer by the method of step 21
Figure BDA0001733175770000063
And a reverse look-up table
Figure BDA0001733175770000064
And look-up the reverse look-up table of the color-chasing printer
Figure BDA0001733175770000065
And a reverse look-up table
Figure BDA0001733175770000071
The reverse lookup table is merged as an updated chase printer
Figure BDA0001733175770000072
The beneficial effects of the further scheme are as follows: generating a reverse lookup table of a color-following printer by printing spectral data of a color-following patch image of a target picture from the color-following printer
Figure BDA0001733175770000073
And a reverse look-up table
Figure BDA0001733175770000074
And combining the two to be used as the reverse lookup table of the updated color-following printer
Figure BDA0001733175770000075
The color tracing can be realized more accurately, so that the printing effect of the color tracing printer is closer to that of a target printer, the color tracing color difference is as small as possible, and the color tracing effect is good.
The invention also provides a color matching system of the ink-jet printer, which comprises an acquisition module, a color matching module and a control module;
the acquisition module is used for respectively acquiring the spectral data of the target printer and the color tracing printer in the original printing states and preprocessing the spectral data;
the color tracing module is used for generating a color tracing lookup table of the color tracing printer according to the preprocessed spectral data;
and the control module is used for controlling the color tracing printer to print the target picture according to the color tracing lookup table.
According to the color-tracing system of the ink-jet printer, the spectral data of the original states of the target printer and the color-tracing printer are obtained through the obtaining module and are preprocessed, the color-tracing module establishes the color-tracing lookup table of the color-tracing printer according to the preprocessed spectral data of the original states, and the control module prints the target picture according to the color-tracing lookup table of the color-tracing printer, so that automatic and efficient color tracing of the ink-jet printer is achieved, dependence on the depth of a qualified color matching worker is avoided, the operation is simple, the cost is saved, the color difference of the color tracing is small, and the restoring effect of a gray level image is good.
The invention also provides a computer readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the method of inkjet printer color chasing.
The invention also provides an ink jet printer color chasing device which is characterized by comprising a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor executes the computer program to realize the steps of the ink jet printer color chasing method.
Drawings
FIG. 1 is a schematic flow chart of a color tracing method of an ink jet printer according to the present invention;
FIG. 2 is a schematic diagram of a color-tracing system of an inkjet printer according to the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The ink jet printer of the present invention may be a conventional four-color printer, and the channel colors include magenta, cyan, yellow, and black, or may be a super four-color printer, and the channel colors include magenta, cyan, yellow, black, red, blue, green, orange, and the like. In the embodiment of the present invention, the printer a and the printer B are included, the printer a is a target printer, the printer B is a color-chasing printer, and the printer a may be a printer B approved by color-chasing before a certain time.
As shown in fig. 1, a method for tracing color of an inkjet printer includes the following steps:
step 1: respectively acquiring spectral data of original states printed by a target printer and a color tracing printer, and preprocessing the spectral data;
step 2: generating a color tracing lookup table of a color tracing printer according to the preprocessed spectral data;
and step 3: and controlling a color tracing printer to print the target picture according to the color tracing lookup table.
According to the color-chasing method of the ink-jet printer, the spectral data of the original states of the target printer and the color-chasing printer are obtained and preprocessed, the color-chasing lookup table of the color-chasing printer is established according to the preprocessed spectral data of the original states, and the target picture is printed according to the color-chasing lookup table of the color-chasing printer, so that automatic and efficient color-chasing of the ink-jet printer is achieved, dependence on qualified color matching personnel is avoided, the operation is simple, the cost is saved, the color difference of the color-chasing is small, and the restoring effect of a gray level image is good.
In an embodiment of the present invention, step 1 specifically includes:
step 11: respectively measuring the spectral data of original color block images of target images printed by a target printer and a color tracing printer by using a light intensity meter;
step 12: converting the spectral data into a Lab value corresponding to a Lab space to generate Lab space data corresponding to a target printer and Lab space data corresponding to a color tracing printer;
step 13: and respectively smoothing the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer.
In the above embodiment, the photometric gradiometer can accurately measure the spectral data of the original color patch images printed by the target printer and the color tracing printer, convert the spectral data into the Lab space, generate the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer, and perform smoothing processing to obtain the corresponding relatively accurate Lab space data, so as to facilitate the subsequent generation of the corresponding first color lookup table according to the Lab space data.
Here, in step 11, assuming that the number of color channels of the printer is n, the ink amount value range of each channel is 0 to 100, and the uniform sampling interval for each channel is l, the total number of color patch combinations is lnThe target printer and the color-chasing printer respectively print the targetThe color patch image of the picture is marked and then the spectral data of the printed color patch is measured with a spectrophotometer.
The step 12 of respectively establishing the target printer color gamut map and the chasing printer color gamut map by using the convex hull method is the prior art, and is not described herein again.
In an embodiment of the present invention, the step 2 specifically includes:
step 21: respectively generating a first color lookup table of the target printer and a first color lookup table of the color tracing printer according to the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer after the smoothing processing;
step 22: performing color gamut conversion processing on a first color lookup table of a target printer to generate a second color lookup table of the target printer;
step 23: carrying out gray scale invariant processing on the second color lookup table of the target printer to obtain a third color lookup table of the target printer;
step 24: and generating a color-following lookup table of the color-following printer according to the third color lookup table of the target printer and the first lookup table of the color-following printer.
The first color lookup tables of the target printer and the color tracing printer can be obtained correspondingly through the Lab space data corresponding to the smoothed target printer and the Lab space data corresponding to the color tracing printer, the spectral data can be converted from one color space to the other color space, color tracing can be achieved conveniently through conversion of different color spaces, and the color of the target picture is restored.
Here, the color lookup table holds a color conversion table from one color space to another color space, and the output values of one set of color space can be obtained by inputting color values of the other set of color space. The color lookup tables for the target printer or the chasing printer include a forward lookup table and a reverse lookup table for the corresponding printer. The input of the printer forward lookup table is the ink amount value of each channel, the output is the corresponding Lab value, the input of the reverse lookup table is the Lab value, and the output is the ink amount value of each channel.
Specifically, on the basis of the above embodiment, the implementation of step 21 is as follows:
performing interpolation processing on the preprocessed Lab spatial data corresponding to the target printer and the preprocessed Lab spatial data corresponding to the color tracing printer respectively to obtain a first color lookup table of the target printer and a first color lookup table of the color tracing printer;
the first color lookup table of the target printer comprises a forward lookup table obtained by respectively performing forward interpolation processing and reverse interpolation processing on Lab space data corresponding to the target printer
Figure BDA0001733175770000101
And a reverse look-up table
Figure BDA0001733175770000102
The first color lookup table of the color-tracing printer comprises a forward lookup table obtained by respectively carrying out forward interpolation processing and reverse interpolation processing on Lab space data corresponding to the color-tracing printer
Figure BDA0001733175770000103
And a reverse look-up table
Figure BDA0001733175770000104
Interpolation processing is respectively carried out on Lab spatial data corresponding to a target printer and Lab spatial data corresponding to a color tracing printer, so that a first color lookup table of the target printer and a first color lookup table of the color tracing printer can be obtained; therefore, mutual mapping between the Lab space value of the spectral data and the ink amount value of the target printer or the color tracing printer is realized, and different color space conversion is conveniently realized.
Specifically, on the basis of the above embodiment, the step 22 specifically includes
Step 221: reverse lookup table for target printer
Figure BDA0001733175770000105
Sampling is carried out, and the corresponding Lab value of the target picture in the Lab space is obtainedThe ink amount value output by the target printer of (1);
step 222: forward lookup table for target printer with ink amount value output by target printer as input
Figure BDA0001733175770000111
Performing interpolation to obtain a Lab value output by the target printer;
step 223: generating a second color lookup table Lut of the target printer according to the Lab value of each pixel of the target picture in the Lab space and the corresponding Lab value output by the target printer1。
By reverse look-up tables for the target printer
Figure BDA0001733175770000112
Sampling processing is carried out, and the sampling result is taken as input to a forward lookup table of the target printer
Figure BDA0001733175770000113
Interpolating, and generating a second color lookup table Lut of the target printer according to the Lab value of each pixel of the target picture in the Lab space and the corresponding Lab value output by the target printer1Thus, through two times of color conversion, the conversion from the target picture color gamut to the target printer color gamut is realized.
Specifically, on the basis of the foregoing embodiment, the implementation of step 23 is as follows:
step 231: look up table Lut according to the second color1Calculating saturation color difference delta E 'between input Lab value and gray color'ab；
Figure BDA0001733175770000114
Step 232: when the second color lookup table Lut1Input Lab value and saturation color difference Delta E 'of gray color'abWhen the set condition is met, the second color lookup table Lut is searched according to the following formula1The output Lab value of the first image is subjected to gray scale invariant processingObtaining a third color lookup table Lut of the target printer2；
Figure BDA0001733175770000115
a2＝a1
b2＝b1
The setting conditions are as follows:
ΔE′ab≤α
wherein, in Lab space, l represents brightness, and a and b represent chroma; the second color lookup table Lut1The input Lab value and the output Lab value of (l) are1,a1,b1) And (l)2,a2,b2)，lmaxAnd lminRespectively represent the second color look-up table Lut1Of the input Lab values of (1) is the maximum value and the minimum value of luminance, l'maxAnd l'minRespectively represent the second color look-up table Lut1And a represents the maximum and minimum values of the luminance among the output Lab values of (a) represents the second color lookup table Lut1And the input Lab value of (2) and the saturation color difference threshold of the gray color.
By calculating a second color look-up table Lut1Inputting the saturation color difference delta E 'of the Lab value and the gray color'abAnd when a preset condition is met, look up the second color lookup table Lut1The output Lab value is processed with unchanged gray scale to obtain a third color lookup table Lut of the target printer2The gray level restoration of the target picture is accurately realized, and the efficient color tracking of the target picture is conveniently realized subsequently.
Suppose, the second color lookup table Lut1The input Lab value and the output Lab value of (l) are1,a1,b1) And (l)2,a2,b2) The saturation color difference can be expressed as follows:
Figure BDA0001733175770000121
since the a and b values of the gray color are both 0, the saturation color difference with the input value and the gray color is:
Figure BDA0001733175770000122
first, the second color lookup table Lut is calculated1Maximum value l of input value brightness lmaxAnd a minimum value of lminCalculating a maximum value l 'of the output value luminance l'maxAnd a minimum value l'minThen, the input value satisfies the setting condition (usually the second color lookup table Lut)1The input Lab value and the saturation color difference threshold alpha of the gray color are taken as 3) to carry out gray scale invariant processing on the output value of the input Lab value and the saturation color difference threshold alpha of the gray color, and a second color lookup table Lut is carried out1All the output values are processed with unchanged gray scale to obtain a third color lookup table Lut2。
Specifically, on the basis of the above embodiment, the implementation of step 24 is as follows:
step 241: inquiring the third color lookup table Lut according to the Lab value of the spectral data corresponding to the target printer2Acquiring an output Lab value corresponding to the target printer;
step 242: inquiring the reverse lookup table of the color-chasing printer according to the output Lab value of the target printer
Figure BDA0001733175770000123
And acquiring a corresponding ink value output by a color tracing printer, and generating a color tracing lookup table comprising the Lab value of each pixel in the target picture and the corresponding ink value output by the color tracing printer.
Querying the third color lookup table Lut by the Lab value of the spectral data corresponding to the target printer2The corresponding output Lab value of the target printer can be accurately obtained, and thus, the reverse lookup table of the color-tracing printer is inquired according to the output Lab value of the target printer
Figure BDA0001733175770000124
Can acquire the pair output by the color-tracing printerAnd applying the ink value to generate a color matching lookup table so as to search the corresponding ink value output by the color matching printer through the Lab value of each pixel in the target picture, thereby completing color matching printing.
In an embodiment of the present invention, the step 3 specifically includes:
and inquiring the color-chasing lookup table according to the Lab value of each pixel in the target picture, acquiring a corresponding ink value output by the color-chasing printer of each pixel in the target picture, and controlling the color-chasing printer to finish printing the target picture.
The ink amount value output by the color tracing printer corresponding to the Lab value of each pixel in the target picture can be accurately inquired through the color tracing lookup table, so that the color tracing printer realizes color tracing printing according to the output ink amount value, and efficient color tracing is realized.
Preferably, in an embodiment of the present invention, the inkjet printer color matching method further includes, after step 3:
and 4, step 4: acquiring spectral data of a color-tracing block diagram of the target picture printed by the color-tracing printer, comparing the spectral data with spectral data of an original color block diagram of the target picture printed by the target printer, and updating the reverse lookup table of the color-tracing printer according to the spectral data of the color-tracing block diagram of the target picture printed by the color-tracing printer if the difference value of the spectral data and the spectral data exceeds a preset error range
Figure BDA0001733175770000131
And returning to the step 22, and repeating the steps (step 22, step 23, step 24, step 3 and step 4) until the difference value between the two is within the preset error, thereby ending the color chasing process.
The spectral data of the color-tracing block diagram of the target picture printed by the color-tracing printer is compared with the spectral data of the original color block diagram of the target picture printed by the target printer, so that whether the difference value of the two is within a set range can be judged, and the circular color-tracing is carried out when the difference value of the two exceeds the set range until the difference value of the two is within the preset error, so that the satisfactory color-tracing effect is achieved.
Specifically, in the above embodiment, the inverse lookup table of the color-following printer is updated according to the spectral data of the color-following patch map of the target picture printed by the color-following printer
Figure BDA0001733175770000132
The specific implementation of the method is as follows:
converting the spectral data of the color-tracing patch map of the target picture printed by the color-tracing printer into Lab space, generating corresponding Lab space data, and generating the forward lookup table of the color-tracing printer by the method of step 21
Figure BDA0001733175770000141
And a reverse look-up table
Figure BDA0001733175770000142
And look-up the reverse look-up table of the color-chasing printer
Figure BDA0001733175770000143
And a reverse look-up table
Figure BDA0001733175770000144
The reverse lookup table is merged as an updated chase printer
Figure BDA0001733175770000145
Generating a reverse lookup table of a color-following printer by printing spectral data of a color-following patch image of a target picture from the color-following printer
Figure BDA0001733175770000146
And a reverse look-up table
Figure BDA0001733175770000147
And combining the two to be used as the reverse lookup table of the updated color-following printer
Figure BDA0001733175770000148
Can realize color tracking more accurately so as to ensure thatThe printing effect of the color-chasing printer is closer to that of the target printer, the color-chasing chromatic aberration is as small as possible, and the color-chasing effect is good.
Here, the printer's inverse look-up table will be chased
Figure BDA0001733175770000149
And a reverse look-up table
Figure BDA00017331757700001410
The combination specifically comprises the following steps: look-up the reverse look-up table
Figure BDA00017331757700001411
Merging the data in (1) into a reverse lookup table
Figure BDA00017331757700001412
Middle (or reverse look-up table)
Figure BDA00017331757700001413
Is merged into the reverse lookup table
Figure BDA00017331757700001414
Middle), the same data is removed and different data is retained, similar to the process of union of two sets of numbers, which enables the reverse lookup table of the updated chasing printer
Figure BDA00017331757700001415
Contain the corresponding relation between more Lab values and the ink volume value of output to make the printing effect of chasing the color printer more closely to the printing effect of target printer, realize more accurate chasing the color.
As shown in fig. 2, the present invention further provides a color-tracing system of an inkjet printer, comprising an obtaining module, a color-tracing module and a control module;
the acquisition module is used for respectively acquiring the spectral data of the original states printed by the target printer and the color tracing printer and preprocessing the spectral data;
the color tracing module is used for generating a color tracing lookup table of the color tracing printer according to the preprocessed spectral data;
and the control module is used for controlling the color tracing printer to print the target picture according to the color tracing lookup table.
According to the color-tracing system of the ink-jet printer, the spectral data of the original states of the target printer and the color-tracing printer are obtained through the obtaining module and are preprocessed, the color-tracing module establishes the color-tracing lookup table of the color-tracing printer according to the preprocessed spectral data of the original states, and the control module prints the target picture according to the color-tracing lookup table of the color-tracing printer, so that automatic and efficient color tracing of the ink-jet printer is achieved, dependence on the depth of a qualified color matching worker is avoided, the operation is simple, the cost is saved, the color difference of the color tracing is small, and the restoring effect of a gray level image is good.
In an embodiment of the present invention, the obtaining module is specifically configured to:
respectively measuring the spectral data of original color block images of target images printed by a target printer and a color tracing printer by using a light intensity meter;
converting the spectral data into a Lab value corresponding to a Lab space, and generating Lab space data corresponding to a target printer and Lab space data corresponding to a color tracing printer;
and respectively smoothing the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer.
The photometric gradiometer can accurately measure the spectral data of original color patch images printed by a target printer and a color tracing printer, then convert the spectral data into a Lab space to generate Lab space data corresponding to the target printer and Lab space data corresponding to the color tracing printer, and then perform smoothing treatment to obtain corresponding relatively accurate Lab space data, so that a corresponding first color lookup table can be conveniently generated according to the Lab space data.
In an embodiment provided by the present invention, the color tracking module includes:
the first submodule respectively generates a first color lookup table of the target printer and a first color lookup table of the color tracing printer according to the Lab spatial data corresponding to the smoothed target printer and the Lab spatial data corresponding to the color tracing printer;
the second submodule is used for carrying out color gamut conversion processing on the first color lookup table of the target printer to generate a second color lookup table of the target printer;
the third sub-module is used for carrying out gray scale invariant processing on the second color lookup table of the target printer to obtain a third color lookup table of the target printer;
and the fourth submodule generates a color-following lookup table of the color-following printer according to the third color lookup table of the target printer and the first lookup table of the color-following printer.
The first color lookup tables of the target printer and the color tracing printer can be obtained correspondingly through the Lab space data corresponding to the smoothed target printer and the Lab space data corresponding to the color tracing printer, the spectral data can be converted from one color space to the other color space, color tracing can be achieved conveniently through conversion of different color spaces, and the color of the target picture is restored.
In an embodiment of the present invention, the first sub-module is specifically configured to:
performing interpolation processing on the preprocessed Lab spatial data corresponding to the target printer and the preprocessed Lab spatial data corresponding to the color tracing printer respectively to obtain a first color lookup table of the target printer and a first color lookup table of the color tracing printer;
the first color lookup table of the target printer comprises a forward lookup table obtained by respectively performing forward interpolation processing and reverse interpolation processing on Lab space data corresponding to the target printer
Figure BDA0001733175770000161
And a reverse look-up table
Figure BDA0001733175770000162
The first color lookup table of the color-tracing printer comprises a forward lookup table obtained by respectively carrying out forward interpolation processing and reverse interpolation processing on Lab space data corresponding to the color-tracing printer
Figure BDA0001733175770000163
And a reverse look-up table
Figure BDA0001733175770000164
Interpolation processing is respectively carried out on Lab spatial data corresponding to a target printer and Lab spatial data corresponding to a color tracing printer, so that a first color lookup table of the target printer and a first color lookup table of the color tracing printer can be obtained; therefore, mutual mapping between the Lab space value of the spectral data and the ink amount value of the target printer or the color tracing printer is realized, and different color space conversion is conveniently realized.
In an embodiment of the present invention, the second sub-module is specifically configured to:
reverse lookup table for target printer
Figure BDA0001733175770000165
Sampling and acquiring an ink amount value output by a target printer corresponding to a Lab value of the target picture in a Lab space;
forward lookup table for target printer with ink amount value output by target printer as input
Figure BDA0001733175770000166
Performing interpolation to obtain a Lab value output by the target printer;
generating a second color lookup table Lut of the target printer according to the Lab value of each pixel of the target picture in the Lab space and the corresponding Lab value output by the target printer1。
By reverse look-up tables for the target printer
Figure BDA0001733175770000167
Sampling processing is carried out, and the sampling result is taken as input to a forward lookup table of the target printer
Figure BDA0001733175770000171
Performing interpolation according to theGenerating a second color lookup table Lut of the target printer by the Lab value of each pixel of the target picture in the Lab space and the corresponding Lab value output by the target printer1Thus, through two times of color conversion, the conversion from the target picture color gamut to the target printer color gamut is realized.
In an embodiment of the present invention, the third sub-module is specifically configured to:
look up table Lut according to the second color1Calculating saturation color difference delta E 'between input Lab value and gray color'ab；
Figure BDA0001733175770000172
When the second color lookup table Lut1Input Lab value and saturation color difference Delta E 'of gray color'abWhen the set condition is met, the second color lookup table Lut is searched according to the following formula1The output Lab value is processed with unchanged gray scale to obtain a third color lookup table Lut of the target printer2；
Figure BDA0001733175770000173
a2＝a1
b2＝b1
The setting conditions are as follows:
ΔE′ab≤α
wherein, in Lab space, l represents brightness, and a and b represent chroma; the second color lookup table Lut1The input Lab value and the output Lab value of (l) are1,a1,b1) And (l)2,a2,b2)，lmaxAnd lminRespectively represent the second color look-up table Lut1Of the input Lab values of (1) is the maximum value and the minimum value of luminance, l'maxAnd l'minRespectively represent the second color look-up table Lut1And a represents the second color lookup tableLut1And the input Lab value of (2) and the saturation color difference threshold of the gray color.
By calculating a second color look-up table Lut1Inputting the saturation color difference delta E 'of the Lab value and the gray color'abAnd when a preset condition is met, look up the second color lookup table Lut1The output Lab value is processed with unchanged gray scale to obtain a third color lookup table Lut of the target printer2The gray level restoration of the target picture is accurately realized, and the efficient color tracking of the target picture is conveniently realized subsequently.
In an embodiment of the present invention, the fourth sub-module is specifically configured to:
inquiring the third color lookup table Lut according to the Lab value of the spectral data corresponding to the target printer2Acquiring an output Lab value corresponding to the target printer;
inquiring the reverse lookup table of the color-chasing printer according to the output Lab value of the target printer
Figure BDA0001733175770000181
And acquiring a corresponding ink value output by a color tracing printer, and generating a color tracing lookup table comprising the Lab value of each pixel in the target picture and the corresponding ink value output by the color tracing printer.
Querying the third color lookup table Lut by the Lab value of the spectral data corresponding to the target printer2The corresponding output Lab value of the target printer can be accurately obtained, and thus, the reverse lookup table of the color-tracing printer is inquired according to the output Lab value of the target printer
Figure BDA0001733175770000182
The corresponding ink value output by the color tracing printer can be obtained, so that a color tracing lookup table is generated, the corresponding ink value output by the color tracing printer can be conveniently searched through the Lab value of each pixel in the target picture, and color tracing printing is completed.
In an embodiment of the present invention, the control module is specifically configured to:
and inquiring the color-chasing lookup table according to the Lab value of each pixel in the target picture, acquiring a corresponding ink value output by the color-chasing printer of each pixel in the target picture, and controlling the color-chasing printer to finish printing the target picture.
The ink amount value output by the color tracing printer corresponding to the Lab value of each pixel in the target picture can be accurately inquired through the color tracing lookup table, so that the color tracing printer realizes color tracing printing according to the output ink amount value, and efficient color tracing is realized.
Preferably, on the basis of the above embodiment, the inkjet printer color-tracing system control module is further configured to:
acquiring spectral data of the color-tracing block diagram of the target picture printed by the color-tracing printer, comparing the spectral data with spectral data of an original color block diagram of the target picture printed by the target printer, and updating the reverse lookup table of the color-tracing printer according to the spectral data of the color-tracing block diagram of the target picture printed by the color-tracing printer if the difference value of the spectral data and the spectral data exceeds a preset error range
Figure BDA0001733175770000183
And repeating the generation of the color-chasing lookup table, the printing of the color-chasing block diagram of the target picture and the circulating color-chasing process until the difference value of the two is within the preset error, and ending the color-chasing process.
The spectral data of the color-tracing block diagram of the target picture printed by the color-tracing printer is compared with the spectral data of the original color block diagram of the target picture printed by the target printer, so that whether the difference value of the two is within a set range can be judged, and the circular color-tracing is carried out when the difference value of the two exceeds the set range until the difference value of the two is within the preset error, so that the satisfactory color-tracing effect is achieved.
Specifically, in the above embodiment, the inverse lookup table of the color-following printer is updated according to the spectral data of the color-following patch map of the target picture printed by the color-following printer
Figure BDA0001733175770000191
The specific implementation of the method is as follows:
printing targets according to a chasing printerThe spectral data of the color-tracing block diagram of the picture is generated into the reverse lookup table of the color-tracing printer by adopting the generation method of the first color lookup table
Figure BDA0001733175770000192
And a reverse look-up table
Figure BDA0001733175770000193
And look-up the forward direction table of the color-chasing printer
Figure BDA0001733175770000194
And a reverse look-up table
Figure BDA0001733175770000195
The reverse lookup table is merged as an updated chase printer
Figure BDA0001733175770000196
Generating a reverse lookup table of a color-following printer by printing spectral data of a color-following patch image of a target picture from the color-following printer
Figure BDA0001733175770000197
And a reverse look-up table
Figure BDA0001733175770000198
And combining the two to be used as the reverse lookup table of the updated color-following printer
Figure BDA0001733175770000199
The color tracing can be realized more accurately, so that the printing effect of the color tracing printer is closer to that of a target printer, the color tracing color difference is as small as possible, and the color tracing effect is good.
The invention also provides a computer storage medium, on which a computer program is stored, which, when executed by a processor, implements the method of inkjet printer color chasing.
The invention also provides an ink jet printer color chasing device which is characterized by comprising a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor executes the computer program to realize the steps of the ink jet printer color chasing method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (12)

1. An ink jet printer color-tracing method is characterized by comprising the following steps:
step 1: respectively acquiring spectral data of a target printer and spectral data of a color tracing printer in original printing states, and preprocessing the spectral data;
step 2: generating a color tracing lookup table of a color tracing printer according to the preprocessed spectral data;
and step 3: controlling a color tracing printer to print a target picture according to the color tracing lookup table;
the step 2 specifically comprises:
step 21: respectively generating a first color lookup table of the target printer and a first color lookup table of the color tracing printer according to the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer after the smoothing processing;
step 22: performing color gamut conversion processing on a first color lookup table of a target printer to generate a second color lookup table of the target printer;
step 23: carrying out gray scale invariant processing on the second color lookup table of the target printer to obtain a third color lookup table of the target printer;
step 24: and generating a color-following lookup table of the color-following printer according to the third color lookup table of the target printer and the first lookup table of the color-following printer.
2. The method for chasing color in an inkjet printer according to claim 1, wherein the step 1 specifically comprises:
step 11: respectively measuring the spectral data of original color block images of target images printed by a target printer and a color tracing printer by using a light intensity meter;
step 12: converting the spectral data into a Lab value corresponding to a Lab space to generate Lab space data corresponding to a target printer and Lab space data corresponding to a color tracing printer;
step 13: and respectively smoothing the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer.
3. A method for tracing a color in an ink jet printer according to claim 1, wherein said step 21 is implemented by:
performing interpolation processing on the preprocessed Lab spatial data corresponding to the target printer and the preprocessed Lab spatial data corresponding to the color tracing printer respectively to obtain a first color lookup table of the target printer and a first color lookup table of the color tracing printer;
the first color lookup table of the target printer comprises a forward lookup table obtained by respectively performing forward interpolation processing and reverse interpolation processing on Lab space data corresponding to the target printer
Figure FDA0002958128180000021
And a reverse look-up table
Figure FDA0002958128180000022
The first color lookup table of the color-tracing printer comprises a forward lookup table obtained by respectively carrying out forward interpolation processing and reverse interpolation processing on Lab space data corresponding to the color-tracing printer
Figure FDA0002958128180000023
And a reverse look-up table
Figure FDA0002958128180000024
4. A method according to claim 3, wherein said step 22 comprises:
step 221: reverse lookup table for target printer
Figure FDA0002958128180000025
Sampling and acquiring an ink amount value output by a target printer corresponding to a Lab value of the target picture in a Lab space;
step 222: forward lookup table for target printer with ink amount value output by target printer as input
Figure FDA0002958128180000026
Performing interpolation to obtain a Lab value output by the target printer;
step 223: generating a second color lookup table Lut of the target printer according to the Lab value of each pixel of the target picture in the Lab space and the corresponding Lab value output by the target printer1。
5. The method for tracing the color of an inkjet printer according to claim 1, wherein the step 23 is implemented by:
step 231: look up table Lut according to the second color1Calculating saturation color difference delta E 'between input Lab value and gray color'ab；
Figure FDA0002958128180000027
Step 232: when the second color lookup table Lut1Input Lab value and saturation color difference Delta E 'of gray color'abWhen the set condition is met, the second color lookup table Lut is searched according to the following formula1The output Lab value is processed with unchanged gray scale to obtain a third color lookup table Lut of the target printer2；
Figure FDA0002958128180000031
a2＝a1
b2＝b1
The setting conditions are as follows:
ΔE′ab≤α
wherein, in Lab space, l represents brightness, and a and b represent chroma; the second color lookup table Lut1The input Lab value and the output Lab value of (l) are1,a1,b1) And (l)2,a2,b2)，lmaxAnd lminRespectively represent the second color look-up table Lut1Of the input Lab values of (1) is the maximum value and the minimum value of luminance, l'maxAnd l'minRespectively represent the second color look-up table Lut1And a represents the maximum and minimum values of the luminance among the output Lab values of (a) represents the second color lookup table Lut1And the input Lab value of (2) and the saturation color difference threshold of the gray color.
6. A method for color chasing in an inkjet printer according to claim 3, wherein step 24 is embodied as:
step 241: inquiring the third color lookup table Lut according to the Lab value of the spectral data corresponding to the target printer2Acquiring an output Lab value corresponding to the target printer;
step 242: inquiring the reverse lookup table of the color-chasing printer according to the output Lab value of the target printer
Figure FDA0002958128180000032
And acquiring a corresponding ink value output by a color tracing printer, and generating a color tracing lookup table comprising the Lab value of each pixel in the target picture and the corresponding ink value output by the color tracing printer.
7. The method for chasing color in an inkjet printer according to claim 6, wherein the step 3 specifically comprises:
and inquiring the color-chasing lookup table according to the Lab value of each pixel in the target picture, acquiring a corresponding ink value output by the color-chasing printer of each pixel in the target picture, and controlling the color-chasing printer to finish printing the target picture.
8. A method of chasing color in an ink jet printer in accordance with claim 3, further comprising, after step 3:
and 4, step 4: acquiring spectral data of a color-tracing block diagram of the target picture printed by the color-tracing printer, comparing the spectral data with spectral data of an original color block diagram of the target picture printed by the target printer, and updating the reverse lookup table of the color-tracing printer according to the spectral data of the color-tracing block diagram of the target picture printed by the color-tracing printer if the difference value of the spectral data and the spectral data exceeds a preset error range
Figure FDA0002958128180000041
And returning to the step 22, and repeating the steps until the difference value of the two is within the preset error, and ending the color chasing process.
9. The method of claim 8, wherein the updating the reverse lookup table of the color-chasing printer is based on spectral data of a color-chasing patch map of a target picture printed by the color-chasing printer
Figure FDA0002958128180000042
The specific implementation of the method is as follows:
converting the spectral data of the color-tracing patch map of the target picture printed by the color-tracing printer into Lab space, generating corresponding Lab space data, and generating the forward lookup table of the color-tracing printer by the method of step 21
Figure FDA0002958128180000043
And a reverse look-up table
Figure FDA0002958128180000044
And will follow the reverse of the color printerLook-up table
Figure FDA0002958128180000045
And a reverse look-up table
Figure FDA0002958128180000046
The reverse lookup table is merged as an updated chase printer
Figure FDA0002958128180000047
10. The color matching system of the ink-jet printer is characterized by comprising an acquisition module, a color matching module and a control module;
the acquisition module is used for respectively acquiring the spectral data of the target printer and the color tracing printer in the original printing states and preprocessing the spectral data;
the color tracing module is used for generating a color tracing lookup table of the color tracing printer according to the preprocessed spectral data;
the control module is used for controlling the color-tracing printer to print the target picture according to the color-tracing lookup table;
the color tracing module is specifically configured to: respectively generating a first color lookup table of the target printer and a first color lookup table of the color tracing printer according to the Lab space data corresponding to the target printer and the Lab space data corresponding to the color tracing printer after the smoothing processing;
performing color gamut conversion processing on a first color lookup table of a target printer to generate a second color lookup table of the target printer;
carrying out gray scale invariant processing on the second color lookup table of the target printer to obtain a third color lookup table of the target printer;
and generating a color-following lookup table of the color-following printer according to the third color lookup table of the target printer and the first lookup table of the color-following printer.
11. A computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the inkjet printer chasing method according to any one of claims 1 to 9.
12. An inkjet printer chasing apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor when executing the computer program implementing the steps of the inkjet printer chasing method according to any one of claims 1 to 9.
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