A control method and device of a color printer, a terminal, and a storage medium

Abstract

This invention discloses a control method, device, terminal, and storage medium for a color printing press. First, it detects whether the target image to be printed is a missing color image. When a missing color image is detected, the color printing press is controlled to enter a missing color printing mode to print the target image. In the missing color printing mode, the color printing press suspends the color printing function of the part responsible for printing the missing color channel. Thus, when the image to be printed is a missing color image, the printing of the missing color channel can be paused, thereby reducing the number of overprints in four-color printing, reducing overprinting deviation, and improving the yield rate of four-color printing. Furthermore, since the printing of the missing color channel is paused, energy saving and improved printing efficiency are also achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of color printing machines, and in particular to a control method and device of a color printing machine, a terminal and a storage medium. BACKGROUND

[0002] Four-color printing is a common printing method in a printing factory, which is different from an inkjet printer used by individuals or small offices, and can better meet the requirements of the printing factory for printing quantity, printing quality and printing speed. An image for four-color printing needs to be converted into a CMYK mode (i.e., a four-color printing mode), wherein C (Cyan) represents cyan, M (Magenta) represents magenta, Y (Yellow) represents yellow, and K (blacK) represents black. When converting, the components of a color image in the C, M, Y and K color channels are extracted. A four-color printing machine is usually provided with four parts (printing cylinders and the like), which are responsible for printing the components of cyan, magenta, yellow and black, respectively. A piece of white paper needs to pass through the four parts in turn after entering the printing machine, and is printed four times in turn, i.e., the cyan part is printed first, and then the magenta, yellow and black parts are printed in turn. Finally, the printing of the C, M, Y and K color channels is superimposed to obtain the final color image printing. However, during printing, the paper is conveyed between the rollers, and due to thermal expansion and contraction, mechanical errors and the like, the positions of the color printing may not be accurately aligned, and the printing positions of the colors may be deviated, thereby affecting the superimposition effect of the color printing and the quality of the final printed product. If the overprint deviation of the color printing is greater than the standard of product control, the paper printed this time will be regarded as waste, which will directly cause loss to the printing factory. Therefore, how to reduce the overprint deviation of four-color printing and improve the yield of four-color printing is a problem that needs to be concerned by the printing factory. SUMMARY

[0003] The technical problem to be solved by the present application is how to reduce the overprint deviation of four-color printing and improve the yield of four-color printing.

[0004] To solve at least one of the above technical problems, the present application discloses a control method of a color printing machine, which comprises:

[0005] detecting whether a target image to be printed is a colorless image, wherein the colorless image refers to an image whose component in any one or more of the C, M, Y and K color channels is zero;

[0006] when it is detected that the target image is a colorless image, controlling the color printing machine to enter a colorless printing mode and printing the target image;

[0007] In the achromatic printing mode, the color printer suspends color printing function of the part of the color printer responsible for color printing of achromatic color channels in the achromatic image.

[0008] As an optional implementation, in the first aspect of the present application, the method further comprises:

[0009] when it is detected that the target image is not an achromatic image, performing achromatic conversion on the target image to convert the target image into an achromatic image;

[0010] controlling the color printer to enter an achromatic printing mode and printing the target image.

[0011] As an optional implementation, in the first aspect of the present application, the achromatic conversion on the target image to convert the target image into an achromatic image comprises:

[0012] detecting whether the component in each color channel of the target image is less than a preset component threshold value;

[0013] when it is detected that the component in a color channel is less than the component threshold value, setting the component in the color channel to zero.

[0014] As an optional implementation, in the first aspect of the present application, the achromatic conversion on the target image to convert the target image into an achromatic image comprises:

[0015] re-setting the component in each color channel of the target image according to a preset color mapping relationship.

[0016] As an optional implementation, in the first aspect of the present application, after the achromatic conversion on the target image to convert the target image into an achromatic image, and before the controlling the color printer to enter an achromatic printing mode and printing the target image, the method further comprises:

[0017] adjusting the component of each color channel in the achromatic image according to color adjustment input of a user.

[0018] As an optional implementation, in the first aspect of the present application, the method further comprises:

[0019] when the color printer is printing the target image, printing the component of each color channel in the target image in a preset order one by one, and printing a trapping detection mark at a designated position when printing each color channel.

[0020] before starting printing of each color channel, judging whether the overprint of the previous color channel printing is qualified according to the overprint detection mark;

[0021] when it is determined that the overprint of the previous color channel printing is qualified, starting printing of the color channel;

[0022] when it is determined that the overprint of the previous color channel printing is not qualified, stopping printing of the color channel and restarting printing of the target image.

[0023] As an optional implementation, in the first aspect of the present application, before detecting whether the target image to be printed is a colorless image, the method further comprises:

[0024] detecting whether the target image needs to use spot color printing;

[0025] when it is determined that the target image needs to use spot color printing, dividing the target image into a spot color printing part and a four-color printing part;

[0026] the color printer control part responsible for spot color printing performs spot color printing on the spot color printing part of the target image;

[0027] the color printer control part responsible for four-color printing performs four-color printing on the four-color printing part of the target image.

[0028] The second aspect of the present application discloses a control device of a color printer, the device comprising:

[0029] a detection module for detecting whether a target image to be printed is a colorless image, wherein the colorless image refers to an image with zero components in one or more than one color channel among C, M, Y and K color channels;

[0030] a colorless printing control module for controlling the color printer to enter a colorless printing mode and print the target image when it is detected that the target image is a colorless image;

[0031] wherein in the colorless printing mode, the color printer suspends color printing function of a part of the color printer responsible for color printing of a colorless color channel, wherein the colorless color channel refers to a color channel with zero components in the colorless image.

[0032] The third aspect of the present application discloses a control terminal of a color printer, the terminal comprising:

[0033] a memory storing executable program codes;

[0034] a processor coupled with the memory;

[0035] The processor invokes the executable program code stored in the memory to execute part or all of the steps in the control method of the color printer according to the first aspect of the present application.

[0036] The fourth aspect of the present application discloses a computer storage medium, which stores computer instructions, and when the computer instructions are invoked, part or all of the steps in the control method of the color printer according to the first aspect of the present application are executed.

[0037] Compared with the prior art, the embodiment of the present application has the following beneficial effects:

[0038] In the embodiment of the present application, whether the target image to be printed is a colorless image is detected first, and when the target image is detected as a colorless image, the color printer is controlled to enter a colorless printing mode to print the target image. In the colorless printing mode, the color printer suspends the color printing function of the part responsible for the color printing of the colorless color channel in the color printer. In this way, when the printed image is a colorless image, the printing using the colorless color channel can be suspended, so that the number of overprintings of four-color printing can be reduced, the overprint deviation of four-color printing can be further reduced, and the yield of four-color printing can be improved. In addition, since the printing of the colorless color channel is suspended, the effect of energy saving and improving the printing efficiency can also be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0040] Figure 1 is a flowchart of a control method of a color printer disclosed by the embodiment of the present application;

[0041] Figure 2 is a physical diagram of a four-color printer related to the embodiment of the present application;

[0042] Figure 3 is a structural schematic diagram of a control device of a color printer disclosed by the embodiment of the present application;

[0043] Figure 4 is a structural schematic diagram of a control terminal of a color printer disclosed by the embodiment of the present application;

[0044] Figure 5 is a structural schematic diagram of a computer storage medium disclosed by the embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0046] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish different objects, rather than to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product, or end including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or end.

[0047] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] The present application discloses a color printer control method, device, terminal and storage medium, first detect whether the target image to be printed is a colorless image, when the target image is detected as a colorless image, control the color printer to enter the colorless printing mode, print the target image, in the colorless printing mode, the color printer will suspend the color printing function of the part responsible for the colorless color channel in the color printer, in this way, when the printed image is a colorless image, the printing using the colorless color channel can be suspended, thereby reducing the overprint times of four-color printing, and further reducing the overprint deviation of four-color printing, and improving the yield rate of four-color printing. In addition, since the printing of the colorless color channel is suspended, the effect of energy saving and improving printing efficiency can also be achieved. The following will be described in detail respectively.

[0049] Embodiment one

[0050] Please refer to Figure 1 , Figure 1 is a flowchart of a color printer control method disclosed by the embodiments of the present application. As shown in Figure 1 , the color printer control method can include the following operations:

[0051] 101. detecting whether a target image to be printed is a missing color image, wherein the missing color image refers to an image whose component in any one or more color channels of C, M, Y and K is zero.

[0052] 102. when it is detected that the target image is a missing color image, controlling the color printer to enter a missing color printing mode and print the target image; wherein in the missing color printing mode, the color printer suspends the color printing function of the part of the color printer responsible for the color printing of the missing color channel, wherein the missing color channel refers to the color channel whose component in the missing color image is zero.

[0053] Figure 2 is a physical diagram of a four-color printer involved in an embodiment of the present application. As shown in Figure 2As shown, a four-color printer is generally composed of four printing parts, each of which is responsible for printing in one of the four color channels C, M, Y and K. When printing, a color image is first converted into a CMYK mode to obtain the components of the color image in the four color channels C, M, Y and K, and then the four parts of the four-color printer are responsible for printing the components in the four color channels respectively. The printed paper is driven by a printing cylinder in the four-color printer and passes through the four parts of the printer in turn, and each time it passes through a part, it is printed with the component in the color channel corresponding to the part. Finally, the printing of the four color channels is superimposed to obtain the color image. In practice, it is found that there are some color images whose components in more than one of the four color channels C, M, Y and K are zero, such as pure cyan, whose C color channel component is 100%, and M, Y, K three color channel components are 0%, and green, which can be C, Y color channel components of 100%, and M, K color channel components of 0%. For such an image whose components in more than one of the four color channels C, M, Y and K are zero, it can be called a missing color image. In the common four-color printing process, for the missing color image, the four printing parts are still started for printing. On the one hand, the missing color image does not need printing in some color channels, and still uses four printing parts for printing, which will cause waste of printing resources and affect the printing efficiency. On the other hand, in the ordinary four-color printing mode, the four printing parts are printed in turn for four times, which means that there are four times of overprinting in the printing process, and each additional overprinting means an additional possibility of overprinting deviation, which is easy to cause the yield rate to drop. Therefore, the present application proposes a missing color printing mode for missing color images. For the missing color channels in the missing color image, the printing function of the corresponding printing part will not be started, and the printing part will only be used for paper transmission, so as to reduce the overprinting times of four-color printing, thereby reducing the overprinting deviation of four-color printing and improving the yield rate of four-color printing, and also achieving the effects of saving printing resources and improving printing efficiency.

[0054] In an optional embodiment, the method further comprises:

[0055] When it is detected that the target image is not a missing color image, performing missing color conversion on the target image to convert the target image into a missing color image;

[0056] Controlling the color printer to enter a missing color printing mode and printing the target image.

[0057] In actual application, the proportion of the original image provided by the customer may not be high. In order to increase the practical application range of the missing color printing mode, for some images with low requirements on printing color, the image can be converted into a missing color image first, and then the missing color printing mode is started to print the image. In this way, the application range of the missing color printing mode can be increased, and the advantages of the missing color printing mode can be fully utilized.

[0058] In an optional embodiment, the missing color conversion of the target image to convert the target image into a missing color image comprises:

[0059] detecting whether the component in each color channel of the target image is less than a preset component threshold value;

[0060] when it is detected that the component in a color channel is less than the component threshold value, setting the component in the color channel to zero.

[0061] In this optional embodiment, when the missing color conversion of the image is performed, a component threshold value can be preset, and when the component in a color channel is less than the component threshold value, the component in the color channel can be set to zero. In order to ensure that the color of the converted image will not deviate too much, the component threshold value can be set to a smaller value as much as possible, so that when the component in the color channel is set to zero, there will not be too much deviation from the component of the original image. For example, when the component threshold value is 15%, the components of an image in C, M, Y, and K color channels are 85%, 20%, 92%, and 11% respectively, and after the missing color conversion, the components of the image in C, M, Y, and K color channels are 85%, 20%, 92%, and 0% respectively, so that the image is converted into a missing color image. Alternatively, different component threshold values can be set for different color channels.

[0062] In an optional embodiment, the missing color conversion of the target image to convert the target image into a missing color image comprises:

[0063] renewing the component in each color channel of the target image according to a preset color mapping relationship.

[0064] In the optional embodiment, the factory can also set the color mapping relationship in the color conversion according to its own rich printing experience, so as to reduce the color deviation caused by the color conversion and improve the printing quality. For example, the components of the first green in the C, M, Y, K color channels are 86%, 20%, 92%, and 11% respectively, and the components of the second green in the C, M, Y, K color channels are 100%, 0%, 100%, and 0% respectively. The first green can be converted into the second green through the preset color mapping relationship. Alternatively, the color mapping relationship can be set with the color conversion mode of various colors, such as the above-mentioned second green as the color conversion mode of green, and then various greens are mapped to the above-mentioned second green.

[0065] In an optional embodiment, after the target image is converted into a colorless image through the colorless conversion of the target image, before the color printer is controlled to enter the colorless printing mode and the target image is printed, the method further comprises:

[0066] According to the color adjustment input of the user, the components of each color channel in the colorless image are adjusted.

[0067] In the optional embodiment, after the target image is converted into a colorless image, the user can also adjust the components of each color channel in the converted colorless image, so that the color requirements of the user can be better considered in the color conversion, and the printing quality is improved.

[0068] In an optional embodiment, the method further comprises:

[0069] When the color printer prints the target image, the components of each color channel in the target image are printed in a preset order, and a trapping detection mark is printed at a specified position when each color channel is printed.

[0070] Before starting the printing of each color channel, it is judged according to the trapping detection mark whether the trapping of the printing of the previous color channel is qualified;

[0071] When it is determined that the trapping of the printing of the previous color channel is qualified, the printing of the color channel is started;

[0072] When it is determined that the trapping of the printing of the previous color channel is not qualified, the printing of the color channel is stopped, and the printing of the target image is restarted.

[0073] In the optional embodiment, in order to detect the overprint deviation of the printing, an overprint detection mark, such as a "+" sign, can be printed at the same blank position of the paper every time the overprint is performed. If the overprint deviation is qualified, the "+" signs of the four overprints will strictly coincide, and only one clear "+" sign will appear in the final printed product. If the overprint deviation is not qualified, the "+" sign in the final printed product can be blurred or ghosted, or even multiple "+" signs can appear, so the printing condition of the "+" sign can be used to determine whether the overprint deviation is qualified. Specifically, the image of the "+" sign can be detected at the pixel level using image processing technology, so that the generated overprint deviation can be accurately detected. Optionally, during the printing process, the overprint detection marks of all previous overprints can be detected before each overprint. If it is detected that the overprint deviation of the previous overprint is too large, the subsequent overprint can be stopped directly, so that the waste of subsequent printing resources can be avoided.

[0074] In an optional embodiment, before detecting whether the target image to be printed is a missing color image, the method further comprises:

[0075] detecting whether the target image needs to use spot color printing;

[0076] when it is determined that the target image needs to use spot color printing, dividing the target image into a spot color printing part and a four-color printing part;

[0077] the part of the color printer responsible for spot color printing performs spot color printing on the spot color printing part of the target image;

[0078] the part of the color printer responsible for four-color printing performs four-color printing on the four-color printing part of the target image.

[0079] In the optional embodiment, spot color printing refers to a printing process that uses other color inks other than CMYK four colors to reproduce the colors of the original manuscript. The color of spot color printing is usually single, and the quality of the printed color is much higher, and the color gamut is also wider, compared with four-color printing. In actual printing process, spot color printing process is often used to print large area background color. In order to further improve the printing effect, spot color printing and four-color printing can be combined in the color printer, the image is divided into a spot color printing part and a four-color printing part, and then the spot color printing process is used for the spot color printing part and the four-color printing process is used for the four-color printing part. Specifically, a fifth part of the spot color printing cylinder can be added to the original four-color printer, and when the paper is printed, in addition to the four-color printing through the CMYK four-color cylinder, the spot color printing through the spot color printing cylinder is also needed. To detect whether the target image can use spot color printing, the following strategies can be used:

[0080] (1) Detect whether the target image has a large area of background color. If there is a large area of background color, spot color printing can be used for this part. Although the printing quality of spot color printing is obviously higher than that of four-color printing, the ink of spot color printing needs to be pre-mixed, and the flexibility of color is lower than that of four-color printing. Once the color of the spot color printing ink is determined, the color of the ink will not be easily changed. And the pre-preparation of spot color printing ink also needs cost. Therefore, spot color printing can be used for this part when there is a large area of background color in the target image. In this way, the characteristics of spot color printing and four-color printing can be combined to achieve better printing results.

[0081] (2) Detect whether the components of more than one color channel in the target image can be completely replaced by spot color printing. If it is judged that the components of more than one color channel can be completely replaced by spot color printing, spot color printing can be used to replace the printing of the color channel, which can reduce the number of overprint of four-color printing, thereby reducing the overprint deviation and improving the yield rate of four-color printing. For example, the components of the C color channel of the target image are all 100%, and the spot color printing of cyan can be used to replace the printing of the C color channel components.

[0082] (3) Detect whether the residual spot color printing ink in the printing factory can be applied to the target image. Since the ink of spot color printing is customized according to the production batch, there will be excess spot color printing ink left after each batch of spot color printing. Therefore, the residual spot color printing ink in the factory can be collected, and if it is suitable for the target image, this part can be separated from the target image and used for spot color printing, while the remaining part of the target image continues to use four-color printing. In this way, the purpose of ink recycling can be achieved, and the printing quality can be improved.

[0083] In an optional embodiment, since the temperature, humidity and other factors of the environment around the color printer can have a certain influence on the final printing effect, the environmental data (such as temperature, humidity, etc.) when the color printer is printing can also be collected to form an environmental data record for tracing the environmental state when printing, so that the printing quality can be more accurately controlled. Further, some environmental abnormality judgment conditions can be set, such as temperature exceeding a preset threshold, humidity exceeding a preset threshold, etc. These abnormal data can be marked in the environmental data to facilitate the staff to trace the abnormal printing process and control the printing quality.

[0084] It can be seen that the implementation Figure 1The control method of the color printer described first detects whether the target image to be printed is a missing color image, when it is detected that the target image is a missing color image, the color printer is controlled to enter a missing color printing mode, and the target image is printed, in the missing color printing mode, the color printer suspends the color printing function of the part responsible for the color printing of the missing color channel in the color printer, so that when the printed image is a missing color image, the printing using the missing color channel can be suspended, thereby reducing the number of overprints of four-color printing, further reducing the overprint deviation of four-color printing, and improving the yield of four-color printing. In addition, since the printing of the missing color channel is suspended, the effect of energy saving and improving the printing efficiency can also be achieved.

[0085] Embodiment Two

[0086] Please refer to Figure 3 , Figure 3 is a structural schematic diagram of a color printer control device disclosed by an embodiment of the application. As shown in Figure 3 , the color printer control device can include:

[0087] The detection module 301 is configured to detect whether a target image to be printed is a missing color image, wherein the missing color image refers to an image in which the component of any one or more color channels in C, M, Y and K color channels is zero.

[0088] The missing color printing control module 302 is configured to control the color printer to enter a missing color printing mode when it is detected that the target image is a missing color image, and print the target image.

[0089] In the missing color printing mode, the color printer suspends the color printing function of the part responsible for the color printing of the missing color channel in the color printer, and the missing color channel refers to the color channel in which the component is zero in the missing color image.

[0090] The specific description of the color printer control device described above can refer to the specific description of the color printer control method described above, and will not be repeated here.

[0091] Embodiment Three

[0092] Please refer to Figure 4 , Figure 4 is a structural schematic diagram of a color printer control terminal disclosed by an embodiment of the application. As shown in Figure 4 , the color printer control terminal can include:

[0093] The memory 401 stores executable program codes;

[0094] The processor 402 is coupled with the memory 401;

[0095] The processor 402 invokes the executable program code stored in the memory 401 to execute the steps in the control method of the color printing machine according to the first embodiment of the present application.

[0096] Embodiment Four

[0097] The computer storage medium according to the embodiments of the present application stores computer instructions, which, when invoked, are used to execute the steps in the control method of the color printing machine according to the first embodiment of the present application.

[0098] The above-described apparatus embodiments are only illustrative, wherein the modules described as separate components can or can not be physically separated, and the components shown as modules can or can not be physical modules, i.e., can be located in one place or distributed to multiple network modules. Part or all of the modules can be selected to achieve the purpose of the present embodiment according to actual needs. Those skilled in the art can understand and implement it without creative labor.

[0099] From the above detailed description of the embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of software product, which can be stored in a computer readable storage medium, including Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically-Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disk storage, magnetic disk storage, magnetic tape storage, or any other computer readable medium that can be used to carry or store data.

[0100] Finally, it should be noted that: the color printing machine control method, device, terminal and storage medium disclosed by the embodiment of the application disclosed only for the preferred embodiment of the application, only for the description of the technical solutions of the application, not to limit; although the application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand; the technical scheme recorded in the foregoing embodiments can be modified, or some technical features can be replaced; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the embodiments of the application.

Claims

1. A control method of a color printer, characterized by, The method comprises: detecting whether a target image to be printed is a colorless image, wherein the colorless image refers to an image with zero components in one or more than one color channel among C, M, Y and K color channels; when it is detected that the target image is a colorless image, controlling the color printer to enter a colorless printing mode and printing the target image; wherein in the colorless printing mode, the color printer suspends color printing functions of parts of the color printer responsible for color printing of colorless color channels, wherein the colorless color channels refer to color channels with zero components in the colorless image; The method further comprises: when it is detected that the target image is not a colorless image, performing colorless conversion on the target image to convert the target image into a colorless image; controlling the color printer to enter a colorless printing mode and printing the target image; The colorless conversion on the target image to convert the target image into a colorless image comprises: detecting whether the components in each color channel of the target image are less than a preset component threshold value; when it is detected that the components in a color channel are less than the component threshold value, setting the components in the color channel to zero; or re-setting the components in each color channel of the target image according to a preset color mapping relationship; The method further comprises: when the color printer is printing the target image, sequentially printing the components of each color channel of the target image in a preset order, and printing a trapping detection mark at a specified position when printing each color channel; before starting to print each color channel, judging whether the trapping of the previous color channel printing is qualified according to the trapping detection mark; when it is determined that the trapping of the previous color channel printing is qualified, starting to print the color channel; when it is determined that the trapping of the previous color channel printing is not qualified, stopping the printing of the color channel and restarting the printing of the target image.

2. The control method of a color printer according to claim 1, characterized by, Before the detection of whether the target image to be printed is a colorless image, the method further comprises: detecting whether the target image needs to use spot color printing; when it is determined that the target image needs to use spot color printing, dividing the target image into a spot color printing part and a four-color printing part; the color printer controls a part responsible for spot color printing to perform spot color printing on the spot color printing part of the target image; the color printer controls a part responsible for four-color printing to perform four-color printing on the four-color printing part of the target image.

3. A control device for a color printer for implementing the control method according to claim 1 or 2, characterized by The device comprises: a detection module configured to detect whether a target image to be printed is a colorless image, wherein the colorless image refers to an image with zero components in one or more than one color channel among C, M, Y and K color channels; a colorless printing control module configured to control the color printer to enter a colorless printing mode and print the target image when it is detected that the target image is a colorless image; In the colorless printing mode, the color printer suspends color printing functions of parts of the color printer responsible for color printing of a color channel of a colorless color channel in the colorless image.

4. A control terminal of a color printer, characterized by comprising: The terminal comprises: a memory storing executable program codes; a processor coupled with the memory; The processor invokes the executable program codes stored in the memory to execute the control method of the color printer according to claim 1 or 2.

5. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 4. The computer program, when executed by the processor, implements the control method of the color printer according to claim 1 or 2.

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