CN117495942A

CN117495942A - Printing ink quantity compensation method, device and equipment based on color channel difference

Info

Publication number: CN117495942A
Application number: CN202210520285.6A
Authority: CN
Inventors: 兰望来; 谢尧斌; 陈艳; 黄中琨
Original assignee: Shenzhen Hansen Software Co ltd
Current assignee: Shenzhen Hansen Software Co ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2024-02-02

Abstract

The invention discloses a printing ink quantity compensation method, device and equipment based on color channel difference, and relates to the technical field of inkjet printing. The method comprises the steps of respectively obtaining the area ratio of ink points ejected by each color channel to the printing medium, obtaining each color channel compensation coefficient according to the area ratio of the ink points of each color channel, and finally carrying out ink quantity compensation on the ink points of the corresponding color channels according to each color channel compensation coefficient, so that the problem of inconsistent area ratio of the ink points or inconsistent image density of a printed image caused by inconsistent chemical compositions of inks of different colors can be avoided, and the printed image with better effect can be obtained.

Description

Printing ink quantity compensation method, device and equipment based on color channel difference

Technical Field

The present invention relates to the field of inkjet printing technologies, and in particular, to a method, an apparatus, and a device for compensating a printing ink amount based on a color channel difference.

Background

The inkjet printing technique refers to a technique of ejecting ink droplets onto a printing medium through nozzles on an inkjet head to obtain an image or text, and an inkjet printing apparatus often obtains a color print image by ejecting four-color inks of C (cyan) M (magenta) Y (yellow) K (black). In an ideal case, when printing the same image data, the ink jet amounts of the ink dots ejected from the different colors by the same external control (for example, waveform and voltage) are substantially the same, and the ink dot coverage area to be ejected onto a printing medium such as paper should be the same. However, in practical applications, due to differences in chemical compositions, viscosity, expansibility and the like of the inks with different colors, coverage areas of ink dots printed on printing media such as paper are different, and finally, the ink dot area occupation ratio or image density of each color channel presented is inconsistent, so that the overall color effect is poor, and the image printing quality is affected. In the prior art, when the problems are solved, the influence caused by the chemical composition difference of different color inks is usually ignored, the printing test is carried out, whether the color effect of the whole image meets the requirement is observed, then the color effect of the whole image is adjusted by repeatedly adjusting the ink output quantity of each color channel, in addition, the color management is carried out on the printer, the printer is adjusted by manufacturing a color management configuration file and the like, so that the output ink quantity of each color channel of the printer is controlled, and the whole color effect of the printer is controlled, but the method needs to spend a great deal of time to print and scan color blocks to acquire color information to manufacture the color management configuration file, then the effect can be achieved through repeated adjustment and optimization, and time and labor are wasted.

Disclosure of Invention

In view of the above, the embodiments of the present invention provide a method, apparatus, device and storage medium for compensating the amount of printing ink based on the difference of color channels, so as to solve the problem that the ink of different color channels affects the printing quality of an image due to the difference of chemical components in the prior art.

In a first aspect, an embodiment of the present invention provides a method for compensating a printing ink amount based on a color channel difference, the method including:

respectively obtaining the area occupation ratio of ink points of the ink jet printing of each color channel in a plurality of color channels, wherein the area occupation ratio of the ink points is the coverage area of the ink points in the unit area;

acquiring compensation coefficients of all the color channels according to the ink dot area occupation ratio of all the color channels;

and according to the compensation coefficient of each color channel, performing ink quantity compensation on the ink points of the corresponding color channel.

Preferably, the acquiring the ink dot area occupation ratio of the ink jet printing of each color channel, wherein the ink dot area occupation ratio is the coverage area of the ink dots in the unit area, and the method comprises the following steps:

controlling each color channel to respectively print color blocks with the same shape and size in an inkjet mode to obtain monochromatic color blocks of each color channel;

and acquiring the ink dot area occupation ratio of each color channel according to the monochromatic color blocks of each color channel.

Preferably, the obtaining the compensation coefficient of each color channel according to the ink dot area ratio of each color channel includes:

and obtaining the compensation coefficient of each color channel according to the ratio of the ink dot area occupation ratio of each color channel to the preset reference ink dot area occupation ratio.

Preferably, the performing ink quantity compensation on the ink dots of the corresponding color channels according to the compensation coefficient of each color channel includes:

acquiring initial ink quantity of ink points of each color channel;

obtaining a final ink quantity according to the color channel compensation coefficient and the initial ink quantity;

and adjusting the ink quantity of the ink points of the corresponding color channels according to the final ink quantity.

Preferably, the method is applied to an inkjet printing apparatus, the inkjet printing apparatus including at least two nozzles, the two nozzle partial regions being spliced in an overlapping manner, the method further comprising:

performing first ink quantity compensation on ink points sprayed at the joint of the spray heads, and obtaining a first ink quantity compensation coefficient;

obtaining a second ink quantity compensation coefficient according to the color channel compensation coefficient and the first ink quantity compensation coefficient;

and carrying out second ink quantity compensation on the ink points sprayed at the joint of the spray heads according to the second ink quantity compensation coefficient.

Preferably, the performing the first ink volume compensation on the ink points ejected at the joint of the nozzle, and obtaining the first ink volume compensation coefficient includes:

respectively obtaining the ink dot area occupation ratio of the image printing area corresponding to the joint of the spray heads and the ink dot area occupation ratio of the image printing area corresponding to the joint of the non-spray heads, and marking the ink dot area occupation ratio as a first ink dot area occupation ratio and a second ink dot area occupation ratio;

and acquiring a first ink quantity compensation coefficient according to the first ink dot area occupation ratio and the second ink dot area occupation ratio.

Preferably, the color channels include a cyan channel, a magenta channel, a yellow channel, and a black channel.

In a second aspect, an embodiment of the present invention provides a printing ink amount compensation apparatus based on a color channel difference, the apparatus including:

the ink dot area occupation ratio acquisition module is used for respectively acquiring the ink dot area occupation ratio of the ink jet printing of each color channel in the plurality of color channels, wherein the ink dot area occupation ratio is the coverage area of the ink dots in the unit area;

the color channel compensation coefficient acquisition module is used for acquiring the compensation coefficient of each color channel according to the ink dot area occupation ratio of each color channel;

and the compensation module is used for compensating the ink quantity of the ink points of the corresponding color channels according to the compensation coefficients of the color channels.

In a third aspect, an embodiment of the present invention provides an inkjet printing apparatus, including: at least one processor, at least one memory and computer program instructions stored in the memory, which when executed by the processor, implement the method as in the first aspect of the embodiments described above.

In a fourth aspect, embodiments of the present invention provide a storage medium having stored thereon computer program instructions which, when executed by a processor, implement a method as in the first aspect of the embodiments described above.

In summary, the beneficial effects of the invention are as follows:

according to the printing ink quantity compensation method, device, equipment and storage medium based on the color channel difference, the ink point area occupation ratio of the ink points ejected by each color channel to the printing medium is respectively obtained, the color channel compensation coefficients are obtained according to the ink point area occupation ratio of each color channel, and finally, the ink quantity compensation is carried out on the ink points of the corresponding color channel according to the color channel compensation coefficients, so that the problem of inconsistent ink point area occupation ratio or image density of a printing image caused by inconsistent chemical components of different color inks can be avoided, and a printing image with better effect can be obtained.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described, and it is within the scope of the present invention to obtain other drawings according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of a printing ink quantity compensation method based on color channel difference according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of multi-nozzle splicing according to an embodiment of the present invention.

FIG. 3 is an exemplary diagram of black and white tracks in accordance with an embodiment of the present invention.

Fig. 4 is a schematic diagram of an image printing area corresponding to a joint of a nozzle according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a printing ink amount compensation device based on a color channel difference according to an embodiment of the present invention.

Fig. 6 is a schematic structural view of an inkjet printing apparatus according to an embodiment of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely configured to illustrate the invention and are not configured to limit the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

Example 1

Referring to fig. 1, an embodiment of the present invention provides a method for compensating a printing ink amount based on a color channel difference, which is suitable for an inkjet printing apparatus, including a Single-Pass inkjet printing apparatus and a shuttle-type scanning inkjet printing apparatus, and in order to increase a printing width, a plurality of nozzles are often used to splice together for printing. An inkjet printing apparatus includes a plurality of color channels, with different color channels ejecting different colors of ink to print a color image.

The method comprises the following steps:

s1: respectively obtaining the area occupation ratio of ink points of the ink jet printing of each color channel in a plurality of color channels, wherein the area occupation ratio of the ink points is the coverage area of the ink points in the unit area;

s2: acquiring compensation coefficients of all the color channels according to the ink dot area occupation ratio of all the color channels;

s3: and according to the compensation coefficient of each color channel, performing ink quantity compensation on the ink points of the corresponding color channel.

Specifically, since there is a certain difference in chemical composition of the inks of the different color channels, even if the same image data is printed, there is a difference in the dot area ratio of the ink ejected onto the printing medium, resulting in that the printing results of the same image data are not uniform for each color channel. The ink dot area ratio is the coverage area of ink dots in a unit area. Therefore, it is necessary to obtain the area ratio of the ink dots ejected from each color channel to the printing medium, and determine the difference between the color channels according to the area ratio of the ink dots, where the difference is represented by the color channel compensation coefficient corresponding to each color channel, and according to the color channel compensation coefficient, perform ink quantity compensation on the ink dots ejected from each color channel during printing, so as to increase or decrease the coverage area of the ink dots in a unit area, and basically adjust the area ratio of the ink dots ejected from different color channels to the printing medium to be consistent, thereby improving the printing quality of the final image.

Preferably, the ink dot area ratio of each color channel ejecting ink dots onto the printing medium is obtained by:

s11: controlling each color channel to respectively print color blocks with the same shape and size in an inkjet mode to obtain monochromatic color blocks of each color channel;

s12: and acquiring the monochromatic color blocks of each color channel to obtain the ink dot area occupation ratio of each color channel.

In the prior art, the PCB ink-jet printing comprises single-point printing and variable-point printing, wherein the single-point printing refers to that the size of ink points sprayed in the whole printing process is unchanged, namely, only ink points with a fixed ink quantity are adopted for printing, and the printing effect is poor when some patterns requiring fine printing are printed because the size of the ink points cannot be changed. The variable dot printing refers to that ink dots sprayed during printing can be divided into large ink dots, medium ink dots, small ink dots and the like according to the ink output, so that small ink dots or medium ink dots can be used for printing in parts requiring fine printing patterns, and the printing effect is better. The single-point printing only needs to obtain the ink dot area ratio of the fixed ink dots sprayed by each color channel, but for the variable-point printing, the ink dot area ratio of the large ink dots, the medium ink dots and the small ink dots of each color channel is further needed to be respectively obtained, and when compensation is performed, compensation of the corresponding ink dot type ink dots is respectively performed according to the color channel compensation coefficients of the various ink dots. In the present embodiment, how to perform the ink amount compensation of the large dots of each color channel is described taking the large dots in the variable dot printing as an example. The ink amount compensation scheme for medium dots, small dots in single-dot printing and variable-dot printing is similar to that for large dots.

Each color channel uses large ink dots to print a color block, and a single color block obtained by ink-jet printing is composed of only large ink dots. Illustratively, the ink jet printing apparatus includes four color channels of C (cyan) M (magenta) Y (yellow) K (black), so that the cyan channel, the magenta channel, the yellow channel, and the black channel print patches of the same shape and size, respectively, resulting in a cyan patch, a magenta patch, a yellow patch, and a black patch. And scanning the color blocks corresponding to the color channels by adopting an image acquisition device (such as Barbierie) to acquire the ink dot area ratio of the large ink dots of each color channel. Ideally, the large dot area ratio of the four color channels is the same to ensure the same density of the printed image. However, in practice, due to the difference in chemical compositions of the inks of different colors, the ink dot area ratio of the finally printed color patches is not necessarily the same. The dot area ratios of the cyan, magenta, yellow, and black channels were set to be 4.9d, 5.2d, 5d, and 5.1d, respectively. In this embodiment, by setting a preset reference dot area ratio, the difference in dot area ratio corresponding to each color channel is obtained by the preset reference dot area ratio. In one embodiment, the color channel compensation coefficients are obtained according to the ratio of the dot area ratio of each color channel to the preset reference dot area ratio. For example, if the preset reference dot area ratio is 5d, the channel compensation coefficients of the four color channels are 0.98, 1.04, 1, 1.02. In another embodiment, the dot area ratio of a certain color channel may also be set as a reference dot area ratio, and then the dot area ratios of other channels are compared with the reference dot area ratio to obtain a color channel compensation coefficient. For example, with the dot area ratio of the yellow channel being 5d as the reference dot area ratio, the channel compensation coefficients of the four color channels obtained are 0.98, 1.04, 1, and 1.02, respectively. In another example, with the ink dot area ratio of the black channel being 5.1 as the reference ink dot area ratio, the channel compensation coefficients of the four color channels are respectively: 0.96,1.02,0.98,1.

After the channel compensation coefficients of the color channels are obtained, the ink quantity compensation is carried out on the ink points of the corresponding color channels according to the channel compensation coefficients of the color channels. The method comprises the following specific steps:

s31: acquiring initial ink quantity of ink points of each color channel;

s32: obtaining final ink quantity of ink points of each color channel according to the compensation coefficient of each color channel and the initial ink quantity;

s33: and adjusting the ink quantity of the ink-emitting points of the corresponding color channels according to the final ink quantity.

An initial ink amount of ink dots ejected by each color channel is acquired before printing. When an image to be printed is sent to a control panel of a printer for printing, firstly, halftone processing is needed to be carried out on the image to be printed, printing data of the image to be printed is obtained, the printing data is image lattice data, the image is subjected to halftone processing to obtain corresponding image lattice data, and the image lattice data is two-dimensional or higher-dimensional tensor data and consists of the dot data. Each dot data is used to characterize the ink output of a corresponding nozzle. Taking 1bit halftone processing as an example (corresponding to single dot printing), dot data includes dot data 0 and dot data 1. Wherein, dot data 0 indicates that the corresponding nozzle does not discharge ink, and dot data 1 indicates that the corresponding nozzle discharges ink. Taking a 2-bit halftone process as an example (variable dot printing), dot data includes dot data 00, dot data 01, dot data 10, and dot data 11, wherein the dot data 00 indicates that the corresponding nozzle does not discharge ink, the dot data 01 indicates that the ink discharge amount of the corresponding nozzle is a small ink amount (e.g., 25%), the dot data 10 indicates that the ink discharge amount of the corresponding nozzle is a medium ink amount (e.g., 50%), and the dot data 11 indicates that the ink discharge amount of the corresponding nozzle is a large ink amount (e.g., 100%). For convenience of description, the dot data 00 is marked as a null dot, the dot data 01 is marked as a small dot, the dot data 10 is marked as a medium dot, and the dot data 11 is marked as a large dot. In this embodiment, variable dot printing can be realized, that is, printing can be performed using any of large dots, medium dots, and small dots, and thus the halftone processing of this embodiment is 2-bit halftone processing.

The ink output amounts of the large ink dot, the medium ink dot, and the small ink dot at the time of printing are different, and by way of example, the ink amount of the large ink dot is set to 10PL, the ink amount of the medium ink dot is set to 7PL, the ink amount of the small ink dot is set to 5PL, if a certain print data (dot data) in the print data is 11, the corresponding ink dot is the large ink dot, the ink amount ejected at the time of printing the ink jet is 10PL, if a certain print data (dot data) in the print data is 10, the corresponding ink dot is the medium ink dot, the ink amount ejected at the time of printing the ink jet is 7PL, if a certain print data (dot data) in the print data is 01, the corresponding ink dot is the small ink dot, and the ink amount ejected at the time of printing the ink jet is 5PL. The ink amounts of the large dots, the medium dots, and the small dots may be determined according to actual printing conditions, and the above 10PL, 7PL, and 5PL are merely examples, and other values are possible in practice.

For single-point printing, since the initial ink amount of the ink dot is fixed, the initial ink amount is multiplied by the compensation coefficient of each color channel to obtain the final ink amount of the ink dot ejected by each color channel. For the variable dot unit, since the large dot, the medium dot, and the small dot are different in the amount of ink for each dot, the respective color channel compensation coefficients of the large dot, the medium dot, and the small dot are acquired. Taking the cyan channel as an example, the color channel compensation coefficients of the large ink dot, the medium ink dot, and the small ink dot ejected by the cyan channel are respectively acquired, and are respectively denoted as C1, C2, and C3. If the ink quantity of the large ink dot is D1, the ink quantity of the medium ink dot is D2, and the ink quantity of the small ink dot is D3, the ink quantity corresponding to the yellow channel when ejecting the large ink dot is c1×d1, the ink quantity corresponding to the medium ink dot is c2×d2, and the ink quantity corresponding to the small ink dot is c3×d3 after the ink quantity compensation.

Similarly, assuming that channel compensation coefficients for the large, medium, and small dots of the magenta channel are denoted by M1, M2, and M3, respectively, the ink amount compensation is performed, the corresponding ink amount when the large dot is ejected from the magenta channel is m1×d1, the corresponding ink amount when the small dot is ejected is m2×d2, and the corresponding ink amount when the small dot is ejected is m3×d3.

According to the ink dot area ratio of the ink dots ejected by each color channel to the printing medium, a corresponding pixel channel compensation coefficient is obtained, so that the ink amount of the ink dot information is compensated, and the problems that the ink dot area ratio or the printing image density are inconsistent and the printing quality of the image is affected due to inconsistent chemical components of the inks with different colors can be avoided.

In addition, the problem of inconsistent image density of the ink printing with different colors is more obvious in the printed images corresponding to the nozzle splicing channels. To increase print swath and print efficiency, multi-jet stitching is often used as shown in FIG. 2. Taking an example in which the ink jet printing apparatus includes four color channels of C (cyan) M (magenta) Y (yellow) K (black), as shown in fig. 2, 12 heads are included in total, which are heads C1 to C3, heads M1 to M3, heads K1 to K3, and heads Y1 to Y3. Each 3 spray heads are spliced to form 1 spliced spray head, and specifically, the spray heads C1, C2 and C3 are spliced to form 1 spliced spray head; the spray head M1, the spray head M2 and the spray head M3 are spliced to form 1 spliced spray head, the spray head K1, the spray head K2 and the spray head K3 are spliced to form 1 spliced spray head, and the spray head Y1, the spray head Y2 and the spray head Y3 are spliced to form 1 spliced spray head.

Each spray head comprises 6 nozzles, and when splicing, splicing is performed in the form of 2 overlapped nozzles. For convenience of description, the nozzle arrangement order of each head from top to bottom in fig. 1 is defined as the front-to-back order of the nozzles. Specifically, the last 2 nozzles of the spray head C1 are overlapped with the first 2 nozzles of the spray head C2, and the last 2 nozzles of the spray head C2 are overlapped with the first 2 nozzles of the spray head C3. Similarly, the heads M1-M3, the heads K1-K3, and the heads Y1-Y3 are spliced in this manner. When printing, half of the overlapped nozzles need to be closed, otherwise, the overlapped nozzles are used for ejecting ink, so that the ink dot area of the repeated ink ejection area is relatively high, and the printing quality is affected. However, even if the closing process is performed, there is still a problem. As shown in fig. 3, since the print carriage is easy to form a "wind wall" at the joint of the nozzles during movement, the air flow rate in the "wind wall" is higher than the surrounding air flow rate, so that the air pressure in the "wind wall" is smaller, the ink dots ejected from the nozzles near the joint of the nozzles are easy to be sucked into the "wind wall", the ink dots overlap, the area of the ink dots at the overlapping position is higher than the surrounding area, and a dark area 10 called a "black channel" is formed visually. Conversely, if the dot area is smaller than the surrounding area, a white area 20 is visually formed, referred to as a "white channel". The problem of black or white tracks is further aggravated by inconsistent dot area ratio caused by different chemical compositions of the inks with different colors, so that the printing quality of the image is greatly reduced.

Referring to fig. 4, the image printing area corresponding to the nozzle splicing position is shown as an area 41 or an area 42 in fig. 4, the image printing area is also called a splicing channel, and the image printing area corresponding to the non-nozzle splicing position is shown as an area 43, an area 44 and an area 45 in fig. 4. Because black or white channels are easy to form at the joint channels, the ink points sprayed to the joint channels need to be compensated, the generation of the black or white channels is reduced or reduced, and meanwhile, the compensation coefficient for compensating the ink points of the joint channels can be adjusted according to the difference of the ink points of different colors at the joint channels. The method comprises the following specific steps:

s4: performing first ink quantity compensation on ink points sprayed at the joint of the spray heads, and obtaining a first ink quantity compensation coefficient;

s5: obtaining a second ink quantity compensation coefficient according to the color channel compensation coefficient and the first ink quantity compensation coefficient;

s6: and carrying out second ink quantity compensation on ink points sprayed at the joint of the spray heads according to the second ink quantity compensation coefficient.

Preferably, performing first ink quantity compensation on ink points ejected at the joint of the nozzle, and obtaining a first ink quantity compensation coefficient includes:

s41: respectively obtaining the ink dot area occupation ratio of the image printing area corresponding to the joint of the spray heads and the ink dot area occupation ratio of the image printing area corresponding to the joint of the non-spray heads, and respectively marking the ink dot area occupation ratio as a first ink dot area occupation ratio and a second ink dot area occupation ratio;

s42: and acquiring a first ink quantity compensation coefficient according to the first ink dot area occupation ratio and the second ink dot area occupation ratio.

Specifically, a nozzle is used for ink-jet printing of a test image, and the ink dot area occupation ratio of the corresponding image printing area (splicing channel) at the splicing position of the nozzle and the ink dot area occupation ratio of the corresponding image printing area (non-splicing channel) at the non-nozzle splicing position are obtained. In one embodiment, the test image is printed by using a single point, an image acquisition device (such as a Barbierie) is used for scanning a spliced channel and a non-spliced channel and acquiring respective ink dot area occupation ratios, namely a first ink dot area occupation ratio A1 and a second ink dot area occupation ratio A2, respectively, so that the ink dot area occupation ratio of the spliced channel is consistent with the ink dot area occupation ratio of the non-spliced channel in order to reduce the black channel or the white channel of the spliced channel, and a first ink quantity compensation coefficient is acquired according to the first ink dot area occupation ratio A1 and the second ink dot area occupation ratio A2 and is denoted as P.

The color channel compensation coefficient of each color channel obtained by the method described in the above embodiment is, for example, set to be C4, M4, Y4, and K4, and the second ink amount compensation coefficient of each color channel may be obtained as follows: p×c4, p×m4, p×y4, p×k4. And during printing, the ink quantity of the ink points of the color channels corresponding to the spliced channels is compensated according to the second ink quantity compensation coefficient.

In another embodiment, the test image is printed using variable dots, i.e., the test image is printed using large dots, medium dots, and small dots, respectively. Similarly, the first ink amount compensation coefficients corresponding to the large ink dot, the medium ink dot and the small ink dot are obtained as P1, P2 and P3, respectively, and the obtained yellow channel compensation coefficient of the large ink dot is C5, the magenta channel compensation coefficient is M5, the yellow channel compensation coefficient is Y5, the black channel compensation coefficient is K5, the second ink amount compensation coefficient of the large ink dot of the cyan channel is p1×c5, the second ink amount compensation coefficient of the medium ink dot of the cyan channel is p2×c5, the second ink amount compensation coefficient of the small ink dot of the cyan channel is p3×c5, and the ink amounts of the various ink dots of the cyan channel are correspondingly compensated or adjusted according to the corresponding second ink amount compensation coefficient when the ink is spliced during printing. Similarly, the second ink quantity compensation coefficients of the large ink dot, the medium ink dot and the small ink dot of the magenta channel, the yellow channel and the black channel can be obtained, and when each color channel is used for ink jet printing of the spliced channel, the ink quantity compensation or adjustment is correspondingly carried out on the large ink dot, the medium ink dot and the small ink dot according to the second ink quantity compensation coefficients.

In summary, according to the method for compensating the printing ink amount based on the color channel difference in the embodiment of the invention, the area ratio of the ink points ejected by each color channel to the ink points on the printing medium is respectively obtained, the compensation coefficient of each color channel is obtained according to the area ratio of the ink points of each color channel, and finally, the ink amount compensation is performed on the ink points of the corresponding color channel according to the compensation coefficient of each color channel, so that the problem of inconsistent ink point area ratio or image density of the printing image caused by inconsistent chemical compositions of different color inks can be avoided, and the printing image with better effect can be obtained. Furthermore, the method compensates the ink points corresponding to the image printing area at the joint of the spray heads according to the color channel compensation coefficient, thereby being beneficial to eliminating black or white channels of the joint channels and greatly improving the image printing quality.

Example two

Referring to fig. 5, an embodiment of the present invention provides a printing ink amount compensation device 200 based on color channel differences, where the device 200 includes:

the ink dot area occupation ratio obtaining module 201 is configured to obtain an ink dot area occupation ratio of ink jet printing of each color channel in the plurality of color channels, where the ink dot area occupation ratio is a coverage area of ink dots in a unit area;

a color channel compensation coefficient obtaining module 202, configured to obtain each color channel compensation coefficient according to the ink dot area occupation ratio of each color channel;

the compensation module 203 is configured to compensate the ink amount of the ink dots of the corresponding color channel according to the compensation coefficient of each color channel.

Further, the dot area ratio obtaining module 201 includes:

the color block acquisition unit is used for controlling each color channel to respectively print color blocks with the same shape and size in an inkjet mode to obtain monochromatic color blocks of each color channel;

and the ink dot area occupation ratio acquisition unit is used for acquiring the monochromatic color blocks of each color channel to acquire the ink dot area occupation ratio of each color channel.

Further, the color channel compensation coefficient obtaining module 202 includes:

the color channel compensation coefficient acquisition unit is used for acquiring the color channel compensation coefficients according to the ratio of the ink dot area occupation ratio of each color channel to the preset reference ink dot area occupation ratio.

Further, the compensation module 203 includes:

an initial ink amount acquisition unit configured to acquire an initial ink amount of ink dots ejected by each color channel;

a final ink amount acquisition unit configured to acquire a final ink amount of ink dots of each color channel according to the compensation coefficient of each color channel and the initial ink amount;

and the adjusting unit is used for adjusting the ink quantity of the ink point ejected by the corresponding color channel according to the final ink quantity.

Further, the compensation module 203 further includes:

the first ink quantity compensation coefficient acquisition unit is used for carrying out first ink quantity compensation on ink points sprayed at the joint of the spray heads and acquiring a first ink quantity compensation coefficient;

a second ink quantity compensation coefficient acquisition unit for acquiring a second ink quantity compensation coefficient according to the color channel compensation coefficient and the first ink quantity compensation coefficient;

and the second ink quantity compensation unit is used for carrying out second ink quantity compensation on the ink points ejected by the corresponding color channels at the joint of the spray heads according to the second ink quantity compensation coefficient.

Further, the first ink amount compensation coefficient acquisition module includes:

the first ink dot area occupation ratio acquisition unit is used for acquiring the ink dot area occupation ratio of the image printing area corresponding to the joint of the spray heads and the ink dot area occupation ratio of the image printing area corresponding to the joint of the non-spray heads respectively, and the ink dot area occupation ratio is recorded as a first ink dot area occupation ratio and a second ink dot area occupation ratio respectively;

and a first ink quantity compensation coefficient acquisition unit for acquiring a first ink quantity compensation coefficient according to the first ink dot area occupation ratio and the second ink dot area occupation ratio.

In summary, according to the device for compensating the printing ink amount based on the color channel difference provided by the embodiment of the invention, the area ratio of the ink points ejected by each color channel to the ink points on the printing medium is respectively obtained, the compensation coefficient of each color channel is obtained according to the area ratio of the ink points of each color channel, and finally, the ink amount compensation is performed on the ink points of the corresponding color channel according to the compensation coefficient of each color channel, so that the problem of inconsistent area ratio of the ink points or inconsistent image density of the printing image caused by inconsistent chemical compositions of different color inks can be avoided, and the printing image with better effect is obtained. Furthermore, the method compensates the ink points corresponding to the image printing area at the joint of the spray heads according to the color channel compensation coefficient, thereby being beneficial to eliminating black or white channels of the joint channels and greatly improving the image printing quality.

Example III

In addition, the printing ink amount compensation method based on the color channel difference according to the embodiment of the present invention may be implemented by an inkjet printing apparatus. Fig. 6 shows a schematic hardware configuration of an inkjet printing apparatus according to an embodiment of the present invention.

The inkjet printing apparatus may include a processor 301 and a memory 302 storing computer program instructions.

In particular, the processor 301 may include a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured as one or more integrated circuits that implement embodiments of the present invention.

Memory 302 may include mass storage for data or instructions. By way of example, and not limitation, memory 302 may comprise a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, magnetic tape, or universal serial bus (Universal Serial Bus, USB) Drive, or a combination of two or more of the foregoing. Memory 302 may include removable or non-removable (or fixed) media, where appropriate. Memory 302 may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory 302 is a non-volatile solid-state memory. In particular embodiments, memory 302 includes Read Only Memory (ROM). The ROM may be mask programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these, where appropriate.

The processor 301 implements any one of the printing ink amount compensation methods based on the color channel difference in the above-described embodiments by reading and executing the computer program instructions stored in the memory 302.

In one example, the inkjet printing device may also include a communication interface 303 and a bus 310. As shown in fig. 5, the processor 301, the memory 302, and the communication interface 303 are connected to each other by a bus 310 and perform communication with each other.

The communication interface 303 is mainly used to implement communication between each module, device, unit and/or apparatus in the embodiment of the present invention.

Bus 310 includes hardware, software, or both, that couple components of the inkjet printing apparatus to one another. By way of example, and not limitation, bus 310 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a micro channel architecture (MCa) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus, or a combination of two or more of the above. Bus 310 may include one or more buses, where appropriate. Although embodiments of the invention have been described and illustrated with respect to a particular bus, the invention contemplates any suitable bus or interconnect.

Example IV

In addition, in combination with the printing ink amount compensation method based on the color channel difference in the above embodiments, the embodiments of the present invention may be implemented by providing a computer-readable storage medium. The computer readable storage medium has stored thereon computer program instructions; the computer program instructions, when executed by the processor 301, implement any of the printing ink quantity compensation methods based on color channel differences in the above-described embodiments.

In summary, according to the method, the device, the equipment and the storage medium for compensating the printing ink amount based on the color channel difference provided by the embodiment of the invention, the area ratio of the ink points ejected by each color channel to the ink points on the printing medium is respectively obtained, the compensation coefficient of each color channel is obtained according to the area ratio of the ink points of each color channel, and finally the ink amount compensation is performed on the ink points of the corresponding color channel according to the compensation coefficient of each color channel, so that the problem of inconsistent area ratio of the ink points or inconsistent image density of the printing image caused by inconsistent chemical compositions of different color inks can be avoided, and the printing image with better effect is obtained. Furthermore, the method compensates the ink points corresponding to the image printing area at the joint of the spray heads according to the color channel compensation coefficient, thereby being beneficial to eliminating black or white channels of the joint channels and greatly improving the image printing quality.

It should be understood that the invention is not limited to the particular arrangements and instrumentality described above and shown in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after appreciating the spirit of the present invention.

The functional blocks shown in the above-described structural block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.

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

In the foregoing, only the specific embodiments of the present invention are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present invention is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and they should be included in the scope of the present invention.

Claims

1. A method of compensating for the amount of printing ink based on color channel differences, the method comprising:

2. The method for compensating for the amount of ink printed based on the difference between color channels according to claim 1, wherein the step of obtaining the dot area ratio of the ink jet printing of each of the plurality of color channels, respectively, wherein the dot area ratio is the coverage area of the dots in the unit area, comprises:

controlling each color channel in the plurality of color channels to respectively print color blocks with the same shape and size in an inkjet mode to obtain monochromatic color blocks of each color channel;

and acquiring the monochromatic color blocks of each color channel to obtain the ink dot area occupation ratio of each color channel.

3. The method of claim 1, wherein the obtaining each color channel compensation coefficient according to the dot area ratio of each color channel comprises:

4. The method of claim 1, wherein the performing ink volume compensation on the ink dots of the corresponding color channel according to each color channel compensation coefficient comprises:

acquiring initial ink quantity of ink points of each color channel;

5. The method for compensating for the amount of printing ink based on the difference of color channels according to claim 1, wherein the method is applied to an inkjet printing apparatus including at least two heads, the two head partial areas being overlapped and spliced, and the compensating for the amount of ink to the ink dots of the corresponding color channels according to each color channel compensation coefficient includes:

and carrying out second ink quantity compensation on the ink points of the corresponding color channels sprayed at the joint of the spray heads according to the second ink quantity compensation coefficient.

6. The method for compensating for a printing ink amount based on a color channel difference according to claim 5, wherein performing the first ink amount compensation on the ink dots ejected from the nozzle splice and obtaining the first ink amount compensation coefficient comprises:

7. The method for compensating for the amount of printing ink based on the difference of color channels according to any one of claims 1 to 6, wherein the color channels include a cyan channel, a magenta channel, a yellow channel, and a black channel.

8. A printing ink amount compensation device based on a color channel difference, the device comprising:

9. An inkjet printing apparatus, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, implement the method of any one of claims 1-7.

10. A storage medium having stored thereon computer program instructions, which when executed by a processor, implement the method of any of claims 1-7.