Data processing and printing method for realizing double-sided printing effect through single-sided printing
Through the processing of image data and adjustment of ink dot distribution, single-sided printing is used to achieve double-sided effect, which solves the problems of high equipment cost, difficulty in operation and low efficiency in the prior art, and achieves the consistency of image color and printing efficiency. promote.
Patent Information
- Application Number
- CN202411307813.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2024-12-27
AI Technical Summary
When the prior art realizes the double-sided printing effect, the equipment costs are high, the maintenance costs are high, the operation is difficult, and the printing efficiency is low, so it is impossible to maintain the consistency of image colors without backlight and with backlight.
Through the processing of image data, special ink dot distribution is generated, the distribution of white and color ink dots is adjusted, and the double-sided printing effect is achieved by single-sided printing. The YMCK4 color and YMCKW5 color image data are used, combined with the nozzle position and resolution of the printing equipment The rate is generated and adjusted white and color dot matrix data to realize the up and down superimposed printing of the image.
The consistency of image color in the absence of backlight and backlight is achieved, the efficiency and effect of image output is improved, the equipment cost and operation complexity is reduced, and the printing efficiency and image accuracy are improved.
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of data processing and printing methods, and in particular to a data processing and printing method for achieving double-sided printing effect by single-sided printing. Background Art
[0002] Color-on-white printing technology is to print three layers of images on the same side of the medium at the same time, namely color, white and color. White is used to separate the two layers of color images. When there is no backlight, the image color will not be too dark; when there is a backlight, the white layer plays a role in reducing light transmittance, so that the image color will not be too light. Although this technology does not require the mechanical structure of the inkjet printer to be redesigned, it will greatly reduce the printing efficiency, which is only about 30% of the normal mode.
[0003] Double-sided printing technology, that is, printing the same image on both sides of the medium at the same time, and the two images overlap accurately, using the low light transmittance of the medium to isolate the light, so that the image color will not be too dark when there is no backlight, and the image color will not be too light when the backlight is on. This technology has very high requirements for the design and manufacture of the mechanical structure of the inkjet printer. The structure is complex and the design and development are difficult; because two sets of print heads are required, the equipment cost is high and the maintenance cost is high; at the same time, because the positions of the images on the front and back sides must be completely overlapped, the actual operation is difficult. Summary of the invention
[0004] The purpose of the present invention is to provide a data processing and printing method for achieving double-sided printing effect by single-sided printing, realizing special ink dot distribution by processing image data, adjusting the distribution of white ink dots and color ink dots in the image data, and realizing a printing mode with double-sided printing effect under the premise of single-sided printing, so as to meet the client's requirement for consistent image color with or without backlight, simplify the client operation, and improve the efficiency and effect of image output.
[0005] The technical solution of the present invention is as follows: A data processing method for achieving double-sided printing effect by single-sided printing, characterized in that it comprises the following steps: S1: Determine the generation rule: The image data file used for printing contains YMCK 4-color image data or YMCKW 5-color image data, and analyze whether the image data file contains white image data: YMCK stands for four colors used in printing, C stands for cyan, M stands for magenta, Y stands for yellow, K stands for black, and W stands for white.
[0006] (1) If there is no white image data and only YMCK4 color image data, the white image data is generated based on the existing color image data in the file. There are two generation rules: The first is the full-frame coverage mode, which means that a white image data is automatically generated for each point in the entire image frame; The second is the image background mode, that is, to determine whether each point in the image contains one of the YMCK4-color image data. If so, a white image data is generated at this point, otherwise no white image data is generated; after the white data is generated, the YMCK4-color image data on the origin image is still retained; If the image data file contains white data, that is, a file containing YMCKW 5-color data, the white image data and the other 4-color image data are read from the image data file in the same manner; S2: Read the first layer of color image dot matrix data from the image data file. Since different color nozzles in the printing device have different horizontal and vertical spacings when installed, the various color image data read from the image data file need to be shifted according to the horizontal and vertical positions of each nozzle, so that the printing data corresponds to the correct nozzle position; the data after the shift operation converts the original horizontally arranged dot matrix data into a vertical arrangement to meet the data arrangement format required by the nozzle when printing; Calculate the first layer of color image dot matrix data according to the above shift and conversion operations; S3: Generate white image dot matrix data: if the original image data file is YMCK4-color image data, then generate white image dot matrix data according to one of the white data generation rules selected by the user in step S1 based on the first layer color image dot matrix data; if the original image data file is YMCKW5-color data, then read the white image dot matrix data from the image data file; When the white image dot matrix data is generated, the optimal density of the white dot matrix data is calculated according to the resolution of the current printed image and the density information of the YMCK4-color dot matrix data of the original image. The density of the white dot matrix data is automatically adjusted by adding or reducing white data points at appropriate positions, so that the color of the printed image is fuller and the color of the image is closer with or without backlight. Calculate the white image dot matrix data according to the shift and conversion operation method described in S2; S3: Read the second layer color image dot matrix data from the image data file: There are two sources of the second layer color image dot matrix data. The first is to use the same data source as the dot matrix data of the first layer of color image, that is, the first layer and the second layer of color image printing use exactly the same dot matrix data; The second method is to read the second layer color image dot matrix data from another image data file, provided that the length, width, resolution and number of colors of this image data file are completely consistent with those of the first layer color image data file; users can choose one of these two methods according to their needs; The second layer color image dot matrix data must be aligned with the first layer color image dot matrix data and white dot matrix data in the horizontal and vertical directions to ensure that the final printed composite image achieves the best printing effect without ghosting, color offset, and rough ink dot problems; Calculate the second layer color image dot matrix data according to the shift and conversion operation method described in S2; S4: At this time, there are three layers of data, namely, the first layer of color image dot matrix data, the white image dot matrix data and the second layer of color image dot matrix data; The printing method of achieving double-sided printing effect by single-sided printing is as follows: all color and white nozzles are evenly divided into two parts, the first layer of color image dot matrix data is placed in the upper half of the color nozzle, and the white image dot matrix data is placed in the upper half of the white nozzle. The above two layers of dot matrix data will be output and printed at the same time; then the second layer of color image dot matrix data is placed in the lower half of the color nozzle for output and printing.
[0007] More preferably, the image dot data to be printed is divided into data blocks for multiple printing scanning cycles and sent to the printing device, and the mechanical motion parameters required for each scanning cycle are sent at the same time. The printing device controls the nozzle to print out corresponding ink dots in each scanning cycle according to the image dot data in the data block and the mechanical motion parameters, and controls the printing medium to advance once after each scanning cycle.
[0008] More preferably, when all scanning cycles are completed, the images printed out in each scanning cycle are spliced together to form a complete image, and the entire image is printed. At this time, the printed image is a composite image formed by the superposition of two layers of images, wherein the lower layer image is a color-white mixed image, and the upper layer image is a color image.
[0009] When the printing material moves forward during the printing process, the upper part of the color and white nozzles first prints the first layer of color dot matrix data and white dot matrix data on the printing material. These two dot matrix data are merged together to form a color-white mixed image; then, the lower part of the color nozzle prints the second layer of color image dot matrix data on the printing material, covering the color-white mixed image formed previously.
[0010] The present invention realizes a new image data ink dot stacking method through innovation in data processing method. Through this stacking method, the white ink dots in the image data can be accurately inserted between two layers of color ink droplets, so that the white ink dots can achieve a light shielding effect on the one hand and set off the color of the second layer on the other hand. In this way, the color is consistent when the backlight is turned on or off.
[0011] Compared with the traditional double-sided printing equipment which needs to print twice on the front and back sides, the present invention only needs a single printing; it avoids the positioning error caused by the two printings and has higher image accuracy; compared with the traditional color-white color printing, the first layer of color and white printed data are output and solidified at the same time through the optimization of the data processing method, which improves the efficiency of image output.
[0012] The images printed by the present invention have no obvious color difference when viewed with or without a backlight, and the image will not have large color difference due to the light transmission effect of the backlight. The reasonable distribution of color and white ink dots is achieved to achieve consistent image performance with or without backlight.
[0013] Compared with the traditional color-white-color mode, the present invention improves efficiency by 50%, saves 50% of equipment cost and labor cost compared with the double-sided spray mode, and greatly simplifies the operation of the client. DETAILED DESCRIPTION
[0014] A data processing method for achieving double-sided printing effect by single-sided printing, characterized in that it comprises the following steps: S1: Determine the generation rule: The image data file used for printing contains YMCK 4-color image data or YMCKW 5-color image data, and analyze whether the image data file contains white image data: Each print dot image is composed of these 4 or 5 color image data points.
[0015] YMCK represents the four colors used in printing, C represents cyan, M represents magenta, Y represents yellow, K represents black, and W represents white.
[0016] (1) If there is no white image data and only YMCK4 color image data, the white image data is generated based on the existing color image data in the file. There are two generation rules: The first is the full-frame coverage mode, which means that a white image data is automatically generated for each point in the entire image frame; The second is the image background mode, that is, to determine whether each point in the image contains one of the YMCK4-color image data. If so, a white image data is generated at this point, otherwise no white image data is generated; after the white data is generated, the YMCK4-color image data on the origin image is still retained; If the image data file contains white data, that is, a file containing YMCKW 5-color data, the white image data and the other 4-color image data are read from the image data file in the same manner; S2: Read the first layer of color image dot matrix data from the image data file. Since different color nozzles in the printing device have different horizontal and vertical spacings when installed, the various color image data read from the image data file need to be shifted according to the horizontal and vertical positions of each nozzle, so that the printing data corresponds to the correct nozzle position; the data after the shift operation is then converted into the vertical arrangement of the dot matrix data originally arranged horizontally by the transposition algorithm, so as to meet the data arrangement format required by the nozzle when printing; Calculate the first layer of color image dot matrix data according to the above shift and conversion operations; S3: Generate white image dot matrix data: if the original image data file is YMCK4-color image data, then generate white image dot matrix data according to one of the white data generation rules selected by the user in step S1 based on the first layer color image dot matrix data; if the original image data file is YMCKW5-color data, then read the white image dot matrix data from the image data file; While the white image dot data is being generated, the optimal concentration of the white dot data is calculated based on the resolution of the current printed image and the concentration information of the YMCK4-color dot data of the original image. The concentration of the white dot data is automatically adjusted by adding or subtracting white data points at appropriate positions, making the printed image color fuller and ensuring that the image color is closer with and without backlight. In addition, users can also manually select the concentration of white data to meet their own image needs.
[0017] Calculate the white image dot matrix data according to the shift and conversion operation method described in S2; S3: Read the second layer color image dot matrix data from the image data file: There are two sources of the second layer color image dot matrix data. The first is to use the same data source as the dot matrix data of the first layer of color image, that is, the first layer and the second layer of color image printing use exactly the same dot matrix data; The second method is to read the second layer color image dot matrix data from another image data file, provided that the length, width, resolution and number of colors of this image data file are completely consistent with those of the first layer color image data file; users can choose one of these two methods according to their needs; The second layer color image dot matrix data must be aligned with the first layer color image dot matrix data and white dot matrix data in the horizontal and vertical directions to ensure that the final printed composite image achieves the best printing effect without ghosting, color offset, and rough ink dot problems; Calculate the second layer color image dot matrix data according to the shift and conversion operation method described in S2; S4: At this time, there are three layers of data, namely, the first layer of color image dot matrix data, the white image dot matrix data and the second layer of color image dot matrix data; The printing method of achieving double-sided printing effect by single-sided printing is as follows: all color and white nozzles are evenly divided into two parts, the first layer of color image dot matrix data is placed in the upper half of the color nozzle, and the white image dot matrix data is placed in the upper half of the white nozzle. The above two layers of dot matrix data will be output and printed at the same time; then the second layer of color image dot matrix data is placed in the lower half of the color nozzle for output and printing.
[0018] When the printing device prints an image, the nozzle needs to scan back and forth multiple times, and the printing medium advances once after each scan by the nozzle. In this way, the entire image can be printed by splicing. The image dot data to be printed is divided into data blocks of multiple printing scanning cycles and sent to the printing device. At the same time, the mechanical motion parameters required for each scanning cycle are sent. The printing device controls the nozzle to print the corresponding ink dots in each scanning cycle according to the image dot data and mechanical motion parameters in the data block, and controls the printing medium to advance once after each scanning cycle.
[0019] When the printing material moves forward during the printing process, the upper part of the color and white nozzles first prints the first layer of color dot matrix data and white dot matrix data on the printing material. These two dot matrix data are merged together to form a color-white mixed image; then, the lower part of the color nozzle prints the second layer of color image dot matrix data on the printing material, covering the color-white mixed image formed previously.
[0020] When all scanning cycles are completed, the images printed out in each scanning cycle are spliced together to form a complete image, and the entire image is printed. At this time, the printed image is a composite image formed by the superposition of two layers of images, among which the lower layer image is a color-white mixed image and the upper layer image is a color image.
Claims
1. A data processing method for achieving double-sided printing effect by single-sided printing, characterized in that: The following steps are involved: S1: Determine the generation rule: The image data file used for printing contains YMCK 4-color image data, or contains YMCKW 5-color image data, and analyze whether the image data file contains white image data: For the YMCK4-color image data file, the execution rule is: generate a white image data in the dot image; For the YMCKW 5-color image data file, the execution rule is: the white image data and the other 4-color image data are read from the image data file in the same way; S2: Read the first layer of color image dot matrix data from the image data file; S3: Generate white image dot matrix data: if the original image data file is YMCK4-color image data, then generate white image dot matrix data according to one of the white data generation rules selected by the user in step S1 based on the first layer color image dot matrix data; if the original image data file is YMCKW5-color data, then read the white image dot matrix data from the image data file; S4: Read the second layer color image dot matrix data from the image data file: The source of the second layer color image dot matrix data is one of the following two: The first is to use the same data source as the dot matrix data of the first layer of color image, that is, the first layer and the second layer of color image printing use exactly the same dot matrix data; The second method is to read the second layer color image dot matrix data from another image data file, provided that the length, width, resolution and number of colors of this image data file are completely consistent with those of the first layer color image data file; users can choose one of these two methods according to their needs; S5: Obtain three layers of data: first layer color image dot matrix data, white image dot matrix data and second layer color image dot matrix data.
2. The data processing method for achieving double-sided printing effect by single-sided printing according to claim 1, characterized in that: In the step S1, for the YMCK 4-color image data file, the execution rule is: generate white image data according to the existing color image data in the file, and the generation rule is one of the following two: The first is the full-frame coverage mode, which means that a white image data is automatically generated for each point in the entire image frame; The second is the image background color mode, that is, to determine whether each point in the image contains one of the YMCK4-color image data. If so, a white image data is generated at this point position, otherwise no white image data is generated; after the white data is generated, the YMCK4-color image data on the origin image is still retained.
3. The data processing method for achieving double-sided printing by single-sided printing according to claim 1, characterized in that: The first layer color image dot matrix data, white image dot matrix data and second layer color image dot matrix data obtained in the above steps S2, S3 and S4 are respectively processed as follows: since the nozzles of different colors in the printing device have different horizontal spacing and vertical spacing when installed, the various color image data read from the image data file need to be shifted according to the horizontal position and vertical position of each nozzle, so that the printing data corresponds to the correct nozzle position; the data after the shift operation converts the original horizontally arranged dot matrix data into a vertical arrangement to meet the data arrangement format required for nozzle printing.
4. The data processing method for achieving double-sided printing by single-sided printing according to claim 1, characterized in that: In the above-mentioned step S3, while the white image dot matrix data is generated, the optimal concentration of the white dot matrix data is calculated according to the resolution of the current printed image and the concentration information of the YMCK4-color dot matrix data of the original image. The concentration of the white dot matrix data is automatically adjusted by adding or subtracting white data points at appropriate positions, so that the color of the printed image is fuller, and at the same time, the color of the image is closer with and without backlight.
5. The data processing method for achieving double-sided printing by single-sided printing according to claim 1, characterized in that: In step S4, the second layer color image dot matrix data needs to be aligned with the first layer color image dot matrix data and the white dot matrix data in the horizontal and vertical directions to ensure that the final printed composite image achieves the best printing effect without ghosting, color offset, and rough ink dot problems.
6. A printing method for achieving double-sided printing effect by single-sided printing, characterized in that: Based on the three layers of data, namely, the first layer of color image dot matrix data, the white image dot matrix data and the second layer of color image dot matrix data obtained by the data processing method described in one of claims 1 to 5, all the color and white nozzles of the printing device are evenly divided into two parts, the first layer of color image dot matrix data is placed in the upper half of the color nozzle, and the white image dot matrix data is placed in the upper half of the white nozzle, and the above two layers of dot matrix data will be output and printed at the same time; then the second layer of color image dot matrix data is placed in the lower half of the color nozzle for output and printing.
7. The printing method for achieving double-sided printing by single-sided printing according to claim 6, characterized in that: The image dot data to be printed is divided into data blocks for multiple printing scanning cycles and sent to the printing device. At the same time, the mechanical motion parameters required for each scanning cycle are sent. The printing device controls the nozzle to print the corresponding ink dots in each scanning cycle according to the image dot data in the data block and the mechanical motion parameters, and controls the printing medium to advance once after each scanning cycle.
8. The printing method for achieving double-sided printing by single-sided printing according to claim 6, characterized in that: When all scanning cycles are completed, the images printed out in each scanning cycle are spliced together to form a complete image, and the entire image is printed. At this time, the printed image is a composite image formed by the superposition of two layers of images, among which the lower layer image is a color-white mixed image and the upper layer image is a color image.
9. The printing method for achieving double-sided printing by single-sided printing according to claim 6, characterized in that: When the printing material moves forward during the printing process, the upper part of the color and white nozzles first prints the first layer of color dot matrix data and white dot matrix data on the printing material, and these two dot matrix data are fused together to form a color and white mixed image; Subsequently, the lower part of the color nozzle prints a second layer of color image dot matrix data on the printing material, covering the color and white mixed image formed previously.