CN109920022B - Method for manufacturing digital printing small-color-difference color correction card - Google Patents
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Abstract
The invention provides a method for manufacturing a digital printing small-color-difference color correction card, which comprises the following steps: establishing a color characteristic file of a jet printer; determining basic colors of a small-color-difference color correction card; determining the expanded color of the small-color-difference color correction card; manufacturing a small-color-difference color correction card; and (5) jet printing output of the small-color-difference color correction card. The invention solves the problems of poor color guidance of the color card after the color correction card is manufactured by changing RGB components, undefined color difference of adjacent colors, inconvenient color block searching and poor matching effect of the color card and the fabric, realizes scientific and simple color card manufacturing, accurate color block color and convenient searching, greatly improves the color correction precision, and shortens the period and time of digital printing color correction.
Description
Technical Field
The invention relates to the technical field of digital printing, in particular to a method for manufacturing a digital printing small-color-difference color correction card.
Background
The digital printing color correction card is used as a reference of a color correction ring section of digital printing and a tool for measuring color difference, plays an extremely important role in the color correction ring section of digital printing, and how to quickly and accurately acquire accurate color component data of a required color in the color correction process becomes a bottleneck problem which needs to be solved urgently in the digital printing industry.
At present, digital printing color correction cards manufactured at home and abroad are generally manufactured by adopting a differential increment method such as RGB or CMYK, and the manufactured color correction cards have the problems of overlarge or undersize color, poor data accuracy and weaker instruction significance. Therefore, the digital printing color correction card which is simple in manufacturing method, high in data accuracy and relatively low in cost is researched and developed, and has very important significance for improving the color correction precision and the color correction efficiency during digital printing color correction.
Disclosure of Invention
The invention aims at solving the problems existing in the prior art and provides a method for manufacturing a digital printing small-color-difference color correction card.
The invention adopts a mode of combining software and hardware, firstly adopts universal color measurement equipment Eye-one and universal color management software i1-Profiler to output a color characteristic standard plate of a digital printing machine in a matching way and obtain an ICC color characteristic file of the printing machine, then calculates by using the ICC characteristic file and a color difference control target to obtain a basic color and an extended color Lab value of a small-color-difference color correction card, and finally calculates to obtain the small-color-difference color correction card in an RGB format taking accurate color difference as a reference.
In order to achieve the above purpose, the invention provides a method for manufacturing a digital printing small-color-difference color correction card, which adopts the following technical scheme:
step 1, establishing a color characteristic file of a digital printing machine
1-1, generating RGB color characteristic mark plates required for manufacturing color characteristic files of a digital printing machine by utilizing general color management software i 1-Profiler;
1-2, outputting the RGB color characteristic standard plate in the step 1-1 on the fabric used for the color correction card according to the standard operation flow of the digital printing machine;
1-3, measuring the RGB color characteristic standard plate in the step 1-2 by using universal color measuring equipment Eye-one to obtain standard plate Lab color data, and then calculating by using i1-Profiler software to obtain an ICC color characteristic file of the digital printing machine;
step 2, determining the basic color of the small-color-difference color correction card
2-1, setting an RGB working space in a digital printing general color correction software Photoshop as the ICC characteristic file of the digital printing machine in the step 1-3;
2-2, inputting RGB values of colors to be corrected in a Photoshop color picker, and recording corresponding color Lab values at the moment, wherein the values are basic color Lab values of a color correction card;
step 3, determining the expanded color of the small-color-difference color correction card
3-1. Determination of the number of color blocks of the Small color difference color correction card
Setting the n multiplied by m number of a color block array of a small-color-difference color correction card according to the Lab value of the basic color and the color correction precision requirement in actual production (n and m are odd numbers, and n and m can be 3 or 5 or 7);
3-2, determining the color difference value of the adjacent color of the small-color-difference color correction card to be manufactured
Setting a color difference value delta E (the color difference value can be set to be 1, 2 and 3 levels) of adjacent colors of the color correction card according to the color correction precision requirement in actual production, wherein the color correction precision is higher, the color difference value requirement is smaller, and a color difference value calculation formula is shown in a formula 1;
equation 1:
△E=((L 1 -L 2 ) 2 +(a 1 -a 2 ) 2 +(b 1 -b 2 ) 2 ) 0.5
3-3 determining the delta a and delta b values of adjacent colors of the small-color-difference color correction card
Determining the delta a value and the delta b value according to the ratio of the absolute values of the a value and the b value in the basic color Lab value, wherein the formula is shown as 2;
equation 2:
if Abs (a/b) > 2, Δa= Δe, Δb= Δe/2
If Abs (b/a) > 2, Δa= Δe/2, Δb= Δe
If 0.5< abs (a/b) <2, Δa= Δe, Δb= Δe
3-4. Determination of the expanded Lab value of the small-color-difference color correction card
According to the basic color Lab value determined in the step 3-1 and the n multiplied by m number of the color block arrays of the small-color-difference color correction card, determining the color of the centremost point of the n multiplied by m color block array as the basic color, and then calculating the Lab value of each color block in each array according to the following principle: the values of L of all color blocks in the array are the same, the values of a of the colors of the color blocks in the same row are the same, the values of b are increased from left to right according to delta b, the values of b of the colors of the color blocks in the same column are the same, and the values of a are increased from top to bottom according to delta a. The a and b values for each color block are calculated as follows (assuming a 3 x 5 array of color blocks),
（a-△a,b-2×△b）（a-△a,b-△b）（a-△a,b）（a-△a,b+△b）（a-△a,b+2×△b）
（a,b-2×△b）（a,b-△b）（a,b）（a,b+△b）（a,b+2×△b）
（a+△a,b-2×△b）（a+△a,b-△b）（a+△a,b）（a+△a,b+△b）（a+△a,b+2×△b）
step 4, manufacturing the small-color-difference color correction card
4-1. Manufacture of small-color-difference color correction card template
Defining a color correction color card template required by actual production in Photoshop, and setting parameters, wherein the size of color blocks is 2 multiplied by 3cm, the spacing between the color blocks is 2mm, and the color mode is Lab;
4-2, inputting the color correction card data containing Lab values obtained in the step 3-4 into a corresponding color correction card template, and then converting a file mode into an RGB mode and storing the RGB mode into a TIFF image format file;
step 5. Jet printing output of the small-color-difference color correction card
And outputting the designed small-color-difference color correction card on a digital printing machine according to a standard operation flow.
The steps 1 to 5 are that through a scientific data algorithm, a basic color Lab value of a color correction color card is calculated by utilizing a color characteristic file of a digital printing machine, and then a color difference consistency and brightness consistency principle is utilized to construct an expanded color of the small-color difference color correction color card, so that an accurate correction function of the small-color difference color correction color card is realized.
Preferably, the RGB color palette in step 1-1 contains 2033 RGB color blocks, and the size of the color blocks is set to be 6×6mm and 2mm at intervals. The RGB color block design can be used for single-point measuring equipment and quick scanning measuring equipment, and meets the requirement of multi-equipment measurement.
Preferably, the standard operation flow in the step 1-2 refers to determining the optimal density curve, the channel ink amount and the corresponding jet printer characteristic file according to the type of the jet printing fabric, so as to ensure that the marking jet printing output is performed under the optimal jet printing parameters.
Preferably, in the step 1-3, when using the Eye-one measurement data of the universal color measurement device, in order to ensure the measurement accuracy of the measurement data, three measurements should be performed, the data are compared, and the average value is calculated after eliminating the abnormal data to obtain the final data.
Preferably, the color block array n×m in the step 3-1 may be set to 3×5, 5×3, 5×5, 7×5, 5×7, 7×7, or 5×5 according to the actual situation, and the manufacturing company may preferably set to 5×5 array, which is suitable in size and best in applicability.
Preferably, the color difference value of the adjacent colors of the small-color difference color correction card in the step 3-2 is set according to the visual difference between the existing color and the target color, wherein the difference is set to be 1 when the difference is small, 2 when the difference is moderate, and 3 when the difference is large.
The invention has the following beneficial effects:
the invention obtains a color characteristic file of a jet printer through designing a special test mark plate on the basis of standard operation of the jet printer, then calculates and obtains a basic color Lab chromaticity value of the jet printer by utilizing the color characteristic file and basic color RGB of a color correction card, then determines the chromatic aberration of adjacent colors of the color correction card by utilizing the basic color Lab value and the color precision requirement, calculates and obtains a complete color correction card Lab chromaticity value, and finally obtains a corresponding RGB color correction card for guiding color correction. The method fully considers the color reproduction characteristics of different fabrics, ensures the accurate color guidance function of the small-color-difference color correction card by utilizing the color difference consistency and brightness consistency, and has the advantages of scientific method, high color card construction speed and strong color card practicability.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Fig. 2 is an RGB color characterization template.
Fig. 3 is a sample of a small-color-difference color-correction color card.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the description of the specific examples is intended for purposes of illustration only and is not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
As shown in fig. 1, 2 and 3, a method for manufacturing a digital printing small-color-difference color correction card comprises the following steps:
step 1, establishing a color characteristic file of a digital printing machine
1-1, generating RGB color characteristic mark plates required for manufacturing color characteristic files of a digital printing machine by utilizing general color management software i 1-Profiler;
the RGB color standard plate refers to a standard plate file containing a series of different RGB values, and the standard plate file contains the color gamut space of the whole RGB;
1-2, outputting the RGB color characteristic standard plate in the step 1-1 on the fabric used for the color correction card according to the standard operation flow of the digital printing machine;
the digital printing standard operation flow refers to the selection of corresponding production process parameters and operation flows according to the characteristics of the fabric adopted by the color correction card during production;
1-3, measuring the RGB color characteristic standard plate in the step 1-2 by using universal color measuring equipment Eye-one to obtain standard plate Lab color data, and then calculating by using i1-Profiler software to obtain an ICC color characteristic file of the digital printing machine;
step 2, determining the basic color of the small-color-difference color correction card
2-1, setting an RGB working space in a digital printing general color correction software Photoshop as the ICC characteristic file of the digital printing machine in the step 1-3;
2-2, inputting RGB values of colors to be corrected in a Photoshop color picker, and recording corresponding color Lab values at the moment, wherein the values are basic color Lab values of a color correction card;
step 3, determining the expanded color of the small-color-difference color correction card
3-1. Determination of the number of color blocks of the Small color difference color correction card
Setting the n multiplied by m number of a color block array of a small-color-difference color correction card according to the Lab value of the basic color and the color correction precision requirement in actual production (n and m are odd numbers, and n and m can be 3 or 5 or 7);
3-2, determining the color difference value of the adjacent color of the small-color-difference color correction card to be manufactured
Setting a color difference value delta E (the color difference value can be set to be 1, 2 and 3 levels) of adjacent colors of the color correction card according to the color correction precision requirement in actual production, wherein the color correction precision is higher, the color difference value requirement is smaller, and a color difference value calculation formula is shown in a formula 1;
equation 1:
△E=((L 1 -L 2 ) 2 +(a 1 -a 2 ) 2 +(b 1 -b 2 ) 2 ) 0.5
3-3 determining the delta a and delta b values of adjacent colors of the small-color-difference color correction card
Determining the delta a value and the delta b value according to the ratio of the absolute values of the a value and the b value in the basic color Lab value, wherein the formula is shown as 2;
equation 2:
if Abs (a/b) > 2, Δa= Δe, Δb= Δe/2
If Abs (b/a) > 2, Δa= Δe/2, Δb= Δe
If 0.5< abs (a/b) <2, Δa= Δe, Δb= Δe
3-4. Determination of the expanded Lab value of the small-color-difference color correction card
According to the basic color Lab value determined in the step 3-1 and the n multiplied by m number of the color block arrays of the small-color-difference color correction card, determining the color of the centremost point of the n multiplied by m color block array as the basic color, and then calculating the Lab value of each color block in each array according to the following principle: the values of L of all color blocks in the array are the same, the values of a of the colors of the color blocks in the same row are the same, the values of b are increased from left to right according to delta b, the values of b of the colors of the color blocks in the same column are the same, and the values of a are increased from top to bottom according to delta a. The a and b values for each color block are calculated as follows (assuming a 3 x 5 array of color blocks),
（a-△a,b-2×△b）（a-△a,b-△b）（a-△a,b）（a-△a,b+△b）（a-△a,b+2×△b）
（a,b-2×△b）（a,b-△b）（a,b）（a,b+△b）（a,b+2×△b）
（a+△a,b-2×△b）（a+△a,b-△b）（a+△a,b）（a+△a,b+△b）（a+△a,b+2×△b）
step 4, manufacturing the small-color-difference color correction card
4-1. Manufacture of small-color-difference color correction card template
Defining a color correction color card template required by actual production in Photoshop, wherein the setting parameters are that the color block size is 2 multiplied by 3cm, the color block spacing is 2mm, the color mode is Lab, and the color correction color card template can be generally set as 3 multiplied by 5, 5 multiplied by 3, 5 multiplied by 5, 7 multiplied by 5, 5 multiplied by 7 and 7 multiplied by 7;
4-2, inputting the color correction card data containing Lab values obtained in the step 3-4 into a corresponding color correction card template, and then converting a file mode into an RGB mode and storing the RGB mode into a TIFF image format file;
step 5. Jet printing output of the small-color-difference color correction card
And outputting the designed small-color-difference color correction card on a digital printing machine according to a standard operation flow.
More specifically, the RGB color characteristic standard in step 1-1 includes 2033 RGB color blocks, the sizes of the RGB color blocks are set to be 6×6mm and 2mm intervals, and the RGB color block designs with the 6×6mm and 2mm intervals can be used for both single-point measurement equipment and rapid scanning measurement equipment, so as to meet the requirement of multi-equipment measurement.
More specifically, the standard operation flow in the step 1-2 refers to determining the optimal density curve, the channel ink amount and the corresponding jet printer characteristic file according to the type of the jet printing fabric, so as to ensure that the marking jet printing output is performed under the optimal jet printing parameters.
More specifically, in the step 1-3, when the universal color measurement device i-one Eye is used to measure data, in order to ensure the measurement accuracy of the measured data, three measurements should be performed, the data are compared, abnormal data are removed, and an average value is calculated to obtain final data.
More specifically, the color block array n×m in step 3-1 may be determined by the manufacturer according to the actual situation, and it is recommended to set a 5×5 array, where the size of the array is suitable and the applicability is optimal.
More specifically, the color difference value of the adjacent colors of the small-color difference color correction card in the step 3-2 is set according to the visual difference between the existing color and the target color, and is set to 1 when the difference is small, 2 when the difference is moderate, and 3 when the difference is large.
The invention obtains a color characteristic file of a jet printer through designing a special test mark plate on the basis of standard operation of the jet printer, then calculates and obtains a basic color Lab chromaticity value of the jet printer by utilizing the color characteristic file and basic color RGB of a color correction card, then determines the chromatic aberration of adjacent colors of the color correction card by utilizing the basic color Lab value and the color precision requirement, calculates and obtains a complete color correction card Lab chromaticity value, and finally obtains a corresponding RGB color correction card for guiding color correction. The method fully considers the color reproduction characteristics of different fabrics, ensures the accurate color guidance function of the small-color-difference color correction card by utilizing the color difference consistency and brightness consistency, and has the advantages of scientific method, high color card construction speed and strong color card practicability.
The implementation method used by the invention is simple, the color chart manufacturing cost is low, the color chart precision is high, and the color chart can be widely applied to different fabrics and different jet printers, and has higher popularization significance and value.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The method for manufacturing the digital printing small-color-difference color correction card is characterized by comprising the following steps of:
step 1, establishing a color characteristic file of a digital printing machine
1-1, generating RGB color characteristic mark plates required for manufacturing color characteristic files of a digital printing machine by utilizing general color management software i 1-Profiler;
1-2, outputting the RGB color characteristic standard plate in the step 1-1 on the fabric used for the color correction card according to the standard operation flow of the digital printing machine;
1-3, measuring the RGB color characteristic standard plate in the step 1-2 by using universal color measuring equipment Eye-one to obtain standard plate Lab color data, and then calculating by using i1-Profiler software to obtain an ICC color characteristic file of the digital printing machine;
step 2, determining the basic color of the small-color-difference color correction card
2-1, setting an RGB working space in a digital printing general color correction software Photoshop as the ICC characteristic file of the digital printing machine in the step 1-3;
2-2, inputting RGB values of colors to be corrected in a Photoshop color picker, and recording corresponding color Lab values at the moment, wherein the values are basic color Lab values of a color correction card;
step 3, determining the expanded color of the small-color-difference color correction card
3-1. Determination of the number of color blocks of the Small color difference color correction card
Setting the number of the color block arrays n multiplied by m of the small-color-difference color correction card according to the basic color Lab value and the color correction precision requirement in actual production, wherein n and m are odd numbers, and n and m can be 3 or 5 or 7;
3-2, determining the color difference value of the adjacent color of the small-color-difference color correction card to be manufactured
Setting a color difference value delta E of adjacent colors of the color correction card according to the color correction precision requirement in actual production, wherein the color difference value is set to be 1, 2 and 3 levels, and the color difference value requirement is smaller when the color correction precision is higher, and a color difference calculated value formula is shown in a formula 1;
equation 1:
△E=((L 1 -L 2 ) 2 +(a 1 -a 2 ) 2 +(b 1 -b 2 ) 2 ) 0.5
3-3 determining the delta a and delta b values of adjacent colors of the small-color-difference color correction card
Determining the delta a value and the delta b value according to the ratio of the absolute values of the a value and the b value in the basic color Lab value, wherein the formula is shown as 2;
equation 2:
if Abs (a/b) > 2, Δa= Δe, Δb= Δe/2
If Abs (b/a) > 2, Δa= Δe/2, Δb= Δe
If 0.5< abs (a/b) <2, Δa= Δe, Δb= Δe
3-4. Determination of the expanded Lab value of the small-color-difference color correction card
According to the basic color Lab value determined in the step 3-1 and the n multiplied by m number of the color block arrays of the small-color-difference color correction card, determining the color of the centremost point of the n multiplied by m color block array as the basic color, and then calculating the Lab value of each color block in each array according to the following principle: the values of L of all color blocks in the array are the same, the values of a of the colors of the color blocks in the same row are the same, the values of b are increased from left to right according to delta b, the values of b of the colors of the color blocks in the same column are the same, and the values of a are increased from top to bottom according to delta a;
step 4, manufacturing the small-color-difference color correction card
4-1. Manufacture of small-color-difference color correction card template
Defining a color correction color card template required by actual production in Photoshop, and setting parameters, wherein the size of color blocks is 2 multiplied by 3cm, the spacing between the color blocks is 2mm, and the color mode is Lab;
4-2, inputting the color correction card data containing Lab values obtained in the step 3-4 into a corresponding color correction card template, and then converting a file mode into an RGB mode and storing the RGB mode into a TIFF image format file;
step 5. Jet printing output of the small-color-difference color correction card
And outputting the designed small-color-difference color correction card on a digital printing machine according to a standard operation flow.
2. The method for manufacturing the digital printing small-color-difference color correction card as claimed in claim 1, wherein the method comprises the following steps: the RGB color standard plate in the step 1-1 contains 2033 RGB color blocks, and the sizes of the color blocks are set to be 6X 6mm and 2mm at intervals.
3. The method for manufacturing the digital printing small-color-difference color correction card as claimed in claim 1, wherein the method comprises the following steps: the standard operation flow in the step 1-2 is to determine the optimal density curve, the channel ink quantity and the corresponding jet printer characteristic file according to the type of the jet printing fabric, so as to ensure that the marking jet printing output is carried out under the optimal jet printing parameters.
4. The method for manufacturing the digital printing small-color-difference color correction card as claimed in claim 1, wherein the method comprises the following steps: when the universal color measurement device Eye-one is used for measuring data in the step 1-3, in order to ensure the measurement accuracy of the measured data, three times of measurement should be carried out, the data are compared, the abnormal data are removed, and then an average value is calculated to obtain final data.
5. The method for manufacturing the digital printing small-color-difference color correction card as claimed in claim 1, wherein the method comprises the following steps: the color block array n×m in the step 3-1 may be set to 3×5, 5×3, 5×5, 7×5, 5×7, 7×7.
6. The method for manufacturing the digital printing small-color-difference color correction card as claimed in claim 1, wherein the method comprises the following steps: the color difference value of the adjacent colors of the small-color-difference color correction card in the step 3-2 is set according to the visual difference between the existing color and the target color, and is set to be 1 when the difference is smaller, 2 when the difference is moderate, and 3 when the difference is larger.
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