228results about How to "Improve printing quality" patented technology

The invention relates to the technical field of digital printing machines, in particular to an intelligent ink droplet control method and system of a digital printing machine and the digital printing machine. The method comprises the steps of real-time data acquisition, multi-dimensional parameter modeling, real-time ink droplet behavior prediction, self-adaptive ink jet parameter adjustment, closed-loop feedback control, medium characteristic self-adaptive matching, intelligent multi-region optimization and environmental factor compensation. Ink droplet behaviors and environmental data are collected in real time through a high-speed camera and various sensors, a nonlinear model is constructed by using a deep learning technology, and a dynamic parameter optimization curve is generated. According to the method, the printing quality and efficiency are remarkably improved, and the method is suitable for various media and complex scenes.

The invention provides a flow monitoring method and device for a 3D printing extruder, and relates to the technical field of additive manufacturing, and the method comprises the steps that material flow data are collected in real time through a multi-dimensional sensor array installed in the 3D printing extruder; transmitting the collected real-time flow data to a control system, and judging whether the material flow is within a preset range or not; according to the deviation between the flow data monitored in real time and the target flow, working parameters of the extruder are automatically adjusted, and adjustment is conducted through a closed-loop feedback control system till the flow is stable; and in the extrusion process, if flow data monitored in real time exceeds a normal working range, an abnormal alarm is triggered, and a corresponding fault processing program is started. The material flow can be accurately monitored in real time, and the working parameters of the extruder can be automatically adjusted according to the monitoring result, so that the stable supply of the material and the quality of the printing process are ensured.

The present application provides a 3D printing method, device, 3D printer and computer equipment, wherein the method includes: obtaining a collection of slice images corresponding to a three-dimensional model to be printed; determining the cross-sectional information of the cross-section in each layer of slice images in the collection of slice images, and based on the cross-sectional information, calculating the printing difficulty value corresponding to each layer of slice images in the collection of slice images; based on the printing difficulty value, respectively determining the printing parameters corresponding to each layer of slice images, and determining the printing operation based on the printing parameters, so as to print the three-dimensional model based on the printing operation. In an embodiment of the present application, during the printing process, the printing parameters can be adaptively adjusted as the printing difficulty value of the slice images changes, thereby improving the printing success rate and printing quality, and at the same time improving the printing efficiency.

The invention discloses an automatic control method for tipping paper printing based on image detection, and relates to the technical field of tipping paper printing, and the method specifically comprises the following steps: obtaining surface feature information of each sub-region in a wrinkling region in a tipping paper printing process in real time, and analyzing the surface feature information after obtaining, respectively generating a light intensity anomaly index and a tension instability index of each sub-region; and constructing a wrinkling influence evaluation model for the light intensity anomaly index and the tension instability index of each generated sub-region, respectively generating a comprehensive evaluation coefficient of each sub-region, performing analysis after generation, and evaluating the influence degree of each sub-region in the wrinkling region on the generated printing alignment parameter. And dividing each sub-region in the wrinkling region into a non-influence region, a low-influence region and a high-influence region according to an evaluation result. According to the invention, the problem of insufficient characteristic identification and evaluation of the wrinkling area is solved, and intelligent improvement of printing alignment precision and finished product quality is realized.

The invention relates to the technical field of 3D printing, and discloses a printing method, device and equipment for a polypropylene workpiece and a storage medium. The method comprises the steps of obtaining initial printing parameters, performing noise reduction and feature extraction to obtain a preprocessed data set, establishing a mapping relation between a physical space and a virtual space through spatial feature vector extraction, and generating an association database of printing environment parameters and material features; performing parameter mapping by adopting a multi-layer neural network, and performing optimization in combination with the crystallization dynamic characteristics of the material to obtain a parameter control strategy; carrying out interlayer distance and path planning on the parameter control strategy to generate a layered printing track; based on the heterogeneous crystallization characteristic of the material, flow and crystallization coupling analysis is conducted on the layered printing track, and a filling printing scheme is obtained through area density calculation; and the filling printing scheme is converted into an equipment instruction, printing is executed, and a target workpiece is finally obtained through real-time monitoring and correction. The printing quality and precision of the polypropylene workpiece are improved.

The invention relates to the technical field of 3D printing control, in particular to a 3D printing control method and system. The method comprises the following steps that a piezoelectric ceramic actuator is used for conducting pulse plastic melting state collection on a 3D printing nozzle, and plastic melt pulse monitoring data are generated; carrying out damping coefficient fitting on the plastic melt pulse monitoring data, and carrying out PID control instruction parameter dynamic adjustment to obtain a plastic melt flow extrusion control strategy; obtaining a target 3D printing model; and intelligent 3D printing control optimization is conducted on the target 3D printing model through a plastic melting flow extrusion control strategy, and an intelligent 3D printing control strategy is obtained. The micro sensor is integrated in the printing nozzle to collect melt flow data in real time, and printing parameters are dynamically adjusted, so that the flow behavior of the high-viscosity plastic melt is accurately controlled, and the surface quality and the size precision of a 3D printing piece are effectively improved.

The utility model relates to a secondary ink cartridge assembly for a printer, which comprises a secondary ink cartridge body, the secondary ink cartridge body comprises an ink cartridge body and an ink cartridge cover which are mutually sealed and covered, a high-pressure ink cavity, a low-pressure ink cavity and a normal-pressure ink cavity are arranged in the ink cartridge body, and the high-pressure ink cavity, the low-pressure ink cavity and the normal-pressure ink cavity are respectively provided with a liquid level sensor. The high-pressure ink cavity is sequentially communicated with the printing spray head, the low-pressure ink cavity, the normal-pressure ink cavity, the second ink pump, the bubble removing device and the first ink pump, so that ink flows out of the high-pressure ink cavity, sequentially flows through the printing spray head, the low-pressure ink cavity, the second ink pump, the normal-pressure ink cavity, the first ink pump and the bubble removing device and then flows back into the high-pressure ink cavity, and therefore a self-circulation ink path is formed. According to the secondary ink box, ink between the secondary ink box body and the printing spray head keeps continuous circulating flow, precipitation is avoided, the temperature of the ink entering the printing spray head is appropriate and constant, the bubble content is small, the pressure fluctuation is small, and therefore the printing quality is higher, and the printing effect is better.

The invention provides a measurement and jet printing integrated device and method for a complex curved surface, and belongs to the field of advanced manufacturing, and the device comprises a motion module, a jet printing and measurement module, an integrated control module, a voltage control module and an air pressure control module. And the motion module can move independently, so that the functions of measuring and jet printing function switching and jet printing height adjustment according to the measured height are realized. The jet printing and measuring module is used for achieving the functions of pattern jet printing and jet printing height detection in the technological process. According to the method, the mode that the actual height of the jet printing needle and the surface of the workpiece is measured multiple times in the jet printing process and the height of the spray head is adjusted is adopted, the height change of the spray head in the complex curved surface jet printing process is reduced, the defects caused by inaccurate digital analog in the complex curved surface jet printing machining process are reduced, and the production efficiency is improved. The problems that in a complex curved surface application scene, the jet printing height of an existing jet printing method cannot be changed according to the curved surface height, so that the jet printing quality is low, and defects are serious are solved, and the jet printing quality is improved.

The invention discloses a screening method for 3D printing powder. The screening method comprises the following steps that powder needing to be screened is prepared; s2, performing screening modes of different levels according to the powder attribute information of the powder: primary screening of the powder; powder is subjected to multi-stage screening; screening fine powder; the screening process is monitored, an alarm detection mechanism is installed, and whether blockage occurs in the screening process or not is judged according to the screening result; different grades of screening modes are carried out by detecting powder attribute information of powder, the alarm mechanism is arranged, whether blockage occurs in the screening process or not is judged according to the screening result, the alarm detection mechanism can be based on the weight of falling materials, when the weight of discharged materials reaches a certain pressure value, it is indicated that work is normal, and the working efficiency is improved. And if the pressure is lower than a normal numerical value, the blanking amount is small, blockage is caused, the blockage and accumulation phenomena of particle materials on the screen are effectively prevented, the continuity and the stability of the screening process are ensured, and the printing quality and the printing consistency are improved.

The invention relates to the technical field of three-dimensional scanning, in particular to a 3D printing product personalized design method based on a three-dimensional scanning human body model. The method comprises the following steps: acquiring human body three-dimensional scanning data and human body composition data; performing movable joint analysis on the human body three-dimensional scanning data to generate human body movable joint data; performing distributed three-dimensional model modeling on the human body three-dimensional scanning data based on the human body movable joint data to generate a human body three-dimensional model; initial human body fitting product design is conducted on the human body three-dimensional model based on the 3D printing technology, and initial 3D printing product parameter data are obtained; according to the method, by combining the human joints, the body composition data and the user feedback, the fitness and the personalized design precision of the 3D printing product are optimized, and the precision and the flexibility of the personalized design of the 3D printing product are improved.

The invention discloses a bar code label designing and printing method and system based on an ARM framework and a storage medium. The method comprises the steps that a label template adding instruction is received, a user is prompted to set basic attributes of a label template, the basic attributes are stored, a label design page is initialized, and at least one label control object is preset in the page; in response to a selection instruction of a user for the label control object, adding the selected label control object into the label template, adjusting the attribute of the label control object according to user operation, and generating a label design effect preview; receiving a saving instruction, and prompting a user to confirm the saved information; receiving a storage confirmation instruction, analyzing the label template and converting the label template into a template definition file; compressing the template definition file to generate a label template compressed package; receiving a label printing instruction, decompressing and analyzing the template compressed package, and obtaining a label printing language; generating a printing instruction set according to the label printing language; and printing scheduling is carried out based on a preset scheduling mode, and the printing instruction set is output to a printer.

The invention discloses an LCD photocuring 3D printer and a method for improving the resolution of the LCD photocuring 3D printer, the angle of light passing through a pixel opening area of an LCD screen is changed by adjusting the angle of a reflector group, the position of a curing light beam in a printing area (photocuring glue) is further influenced, so that the offset of a pixel image is realized, and when the offset is carried out for n times, the position of the curing light beam in the printing area (photocuring glue) is changed. Compared with the prior art, n times of pixel points are added on the basis of an original image, namely, the resolution ratio of the LCD is expanded in a multiplied mode, the effect of improving the resolution ratio of the LCD photocuring 3D printer in a multiplied mode is achieved, meanwhile, the sufficiency and compactness of an exposure area are improved, and the printing yield is improved.

The invention relates to the technical field of 3D printing, in particular to a Z-axis zeroing method and 3D printing equipment. The Z-axis zeroing method comprises the steps that a printing head and a printing platform are controlled to get close, and when the printing head makes contact with the printing platform, approaching operation is stopped; the printing head and the printing platform are controlled to be far away, and when the printing head and the printing platform are separated, far-away operation is stopped. Through a pre-pressing lifting mechanism that the printing head and the printing platform firstly abut against each other and then are separated from each other, deformation errors caused by tiny deformation of abutting contact of the printing head and the printing platform can be eliminated, Z-axis high-precision self-adaptive zeroing is achieved, and due to the fact that the deformation errors caused by contact deformation of the printing head and the printing platform are eliminated, the self-adaptive zeroing efficiency is improved. Therefore, the accuracy of the Z-axis return-to-zero position is improved, the printing quality of the first layer during printing can be ensured, the printing effect of the subsequent layers is also effectively guaranteed, and the precision, efficiency and quality of 3D printing are improved.

The invention discloses a pressure feedback analysis method and system applied to a visual printer, and the method comprises the steps: obtaining historical printing instances of a target model visual printer, carrying out the feature extraction of each historical printing instance, evaluating the printing quality of each historical printing instance, and constructing a historical printing instance data set; based on the historical printing instance data set, the relation among the printing pressure, the printing quality and the printing control parameters is analyzed, and a fusion topological structure diagram is constructed through the relation among the printing pressure, the printing quality and the printing control parameters; building a printing quality prediction model, carrying out model training through the historical printing instance data set and the fused topological structure diagram, obtaining real-time printing pressure monitoring information, predicting real-time printing quality, and judging whether the real-time printing quality meets a printing quality standard or not; and if the printing quality standard is not reached, optimizing the current printing control parameters, and generating a printing parameter regulation and control scheme for regulation and control. Therefore, printing quality is improved and rejection rate is reduced.

The invention belongs to the technical field of printers, and provides a wire buffering device and method for a 3D printer, and the buffering device comprises a shell, a buffering module and a detection module; the buffer module comprises a buffer cavity, a first guide surface and a second guide surface; the buffer cavity is formed in the shell, the first guide surface and the second guide surface are oppositely arranged in the buffer cavity, and the curvature of the second guide surface is larger than that of the first guide surface; a feeding hole and a discharging hole are formed in the shell; the detection module comprises a swing part and an inductor; one end of the swing part is rotationally connected with the shell, and the other end of the swing part is a sensing end; the inductor is used for detecting the position of the induction end; and an elastic element is arranged between the swinging piece and the shell. According to the device, the buffering and adjusting effects can be achieved between conveying devices with different conveying efficiencies, stable and synchronous conveying of wires is guaranteed, and the stability and reliability of 3D printing are improved advantageously.

The utility model discloses a printing electrostatic ink absorption device, which belongs to the technical field of printing, aims at solving the problem that the printing quality is influenced as dust removal and static elimination cannot be carried out, and comprises a box body, a feeding port is formed in the left side of the box body, a discharging port is formed in the right side of the box body, and conveying mechanisms are arranged in the feeding port and the discharging port. A driving device is fixedly installed on the front side of the box body, a plate roller is fixedly installed on the driving device and rotatably installed in the box body through a bearing, an electrostatic rubber roller is rotatably installed on the upper portion of the box body and located in the box body, and an electrostatic discharge rod is fixedly installed on the upper portion of the electrostatic rubber roller and located in the box body. Static elimination rollers are rotationally mounted on the left side and the right side of the electrostatic discharge rod in the box body; by means of the conveying mechanism, dust on the surface of a printed object can be subjected to electrostatic adsorption cleaning in the conveying and printing process of the printed object, so that the printing quality in the subsequent printing process is improved, and the printing effect is ensured.

The invention relates to a printing mechanism, a printing system and imaging equipment. The printing mechanism can comprise a printing module and a printing driving module. The printing module comprises a rotating frame, and an ink jet structure is arranged on the rotating frame; the printing driving module comprises a pivot and a printing driving device; the printing driving device is used for driving the rotating frame to rotate and swing around the pivot; and the printing module is used for performing ink-jet printing when the rotating frame rotates and swings. According to the technical scheme provided by the invention, the structure of the printing mechanism can become compact, the size of the printing mechanism is reduced, and meanwhile, the part complexity of the printing mechanism is avoided; and the rotating frame can be accurately controlled to swing around the pivot in a reciprocating mode, printing flexibility is improved, the printing position can be adjusted according to printing requirements, and printing efficiency is improved.

The invention discloses a parallel multi-head three-dimensional printer tool head lifting structure and a height difference measuring method, and relates to the technical field of three-dimensional printing, the parallel multi-head three-dimensional printer tool head lifting structure comprises a tool head, a back plate and a lifting assembly, the side face of the tool head is slidably assembled on the back plate, the lifting assembly comprises a driving piece and a connecting piece, and the driving piece is used for driving the connecting piece to retract and release; the connector is used for driving the tool head to lift; and a photoelectric switch is arranged on the back plate. A traditional short-range rigid driving scheme is replaced on the premise that the precision is guaranteed, the motion quality of the tool head is reduced, and help is provided for improving the motion speed and the printing quality. In addition, the height difference measuring method based on the scheme is simplified, the measuring precision and the repeated positioning precision are improved, and the reliability is greatly improved.

The invention discloses a preparation method of a carbon fiber reinforced nylon wire for 3D printing, which comprises the following steps: a, carbon fiber surface treatment: carrying out surface treatment on chopped carbon fibers to obtain compatible modified carbon fibers; b, mixing the materials: stirring and mixing the nylon powder, the compatibility modified carbon fiber, the antioxidant and the light stabilizer; c, melting and mould pressing: uniformly paving the uniformly mixed powder on a mould pressing heating plate with a groove structure, performing hot pressing to melt the powder, and then transferring a mould to a cold press to be cooled into a thin round rod shape; d, stretching and forming: enabling the molten and cooled thin round rod to pass through a continuous heating cylinder stretching device; and e, cooling and shaping: feeding the stretched material into a cooling device for rapid cooling and shaping, and winding to obtain the nylon wire with the multidirectional random dispersion carbon fiber reinforcement characteristic. Through multidirectional random dispersion of the carbon fibers in a nylon matrix, the all-directional mechanical properties of a printed product are remarkably improved.

The invention discloses a position searching device for gear separation and resetting of ink printing equipment, which comprises a plate roller gear and a bottom roller gear which can be meshed or separated, and further comprises an adjusting transmission assembly, a positioning assembly and a positioning assembly, the adjusting driving unit is used for being in clutch transmission fit with the transmission assembly; the adjusting transmission assembly comprises a driven gear which is in coaxial transmission fit with the printing roller gear, a driving gear which is in clutch transmission with the adjusting driving unit, and a printing roller original point electric eye which is used for monitoring and recording the initial direction of the driving gear. The driven gear is in transmission fit with the driving gear, so that the driven gear, the driving gear and the printing roller gear act synchronously; and when the printing roller gear needs to be reset and switched from the separation state to the meshing state, the driving gear is driven by the adjusting driving unit to rotate and reset to the initial direction recorded by the printing roller original point electric eye in advance.

The utility model belongs to the technical field of non-woven fabric bag production and processing, and particularly relates to a mark printing machine for non-woven fabric bag production. Comprising a workbench, supporting foot stools arranged at the bottom of the workbench, a driving roller and a driven roller arranged in the workbench, a conveying belt arranged on the surfaces of the driving roller and the driven roller, a motor arranged on one side of the workbench, and a driving belt wheel arranged at one end of the driven roller, wherein the output end of the motor is connected with the driving roller; the jet printing assembly comprises a first curved frame arranged at the top of the workbench, a lifting air cylinder arranged at the top of the first curved frame, a jet printing head arranged at the bottom of the output end of the lifting air cylinder, a lifting plate arranged on the surface of the output end of the lifting air cylinder, and connecting frames arranged on the two sides of the lifting plate. The device is reasonable in structure, in the using process, a cloth bag can be fixed, the situation that the cloth bag shakes in the jet printing process, and the jet printing quality is affected is prevented, meanwhile, after jet printing is completed, printing ink can be rapidly dried, and follow-up processing is facilitated.

This invention discloses a gravure printing ink composition and its preparation method. The ink, by weight, comprises: 15-35 parts chlorinated polypropylene, 10-20 parts EVA-40W, 4-8 parts rosin-modified resin, 0.3-0.8 parts polyketide resin, 0.1-0.3 parts chlorinated ether resin MP45, 0.3-0.8 parts silica, 0.05-0.15 parts antistatic agent, 0.2-0.5 parts dispersant, 0.1-0.3 parts modified aluminum silicate AM660, 8-12 parts benzidine yellow, 6-10 parts fast red BHXL-T, 3-5 parts permanent orange yellow No. 13, 3-7 parts calcium powder, and 30-50 parts mixed solvent. During preparation, each resin is pre-dissolved separately, then mixed with pigments, additives, etc., and ground to a fineness ≤15μm. The ink of this invention has bright colors, good light resistance, excellent adhesion, antistatic properties, and printability, and is particularly suitable for gravure printing on polyolefin films.

The present invention provides a three-dimensional molding wire material and a preparation method thereof, a three-dimensional printer and a three-dimensional molding method. The three-dimensional molding wire material of the present invention comprises a core wire and a wrapping layer wrapped outside the core wire, the core wire comprises metal powder, a binder, a dispersant and a flexibility enhancer, and the weight percentage of the metal powder in the core wire is more than 60%. The three-dimensional printer of the present invention comprises a wire material tray, a cleaning mechanism and a print head, the wire material tray is wound with the three-dimensional molding wire material, the cleaning mechanism is used to remove the wrapping layer of the three-dimensional molding wire material, one end of the core wire of the three-dimensional molding wire material is transmitted to the print head, and the print head is provided with a heating device, and the heating device is used to heat the core wire in the print head. The three-dimensional molding wire material of the present invention has good flexibility and can be kept dry, and the three-dimensional printer of the present invention is provided with a cleaning mechanism for removing the wrapping layer of the three-dimensional molding wire material, so that the wrapping layer does not participate in printing into the molding object, aiming to improve the quality of FDM metal three-dimensional printing.

The utility model provides a self-adaptive synchronizing wheel assembly, a printing dolly and an industrial printer, the self-adaptive synchronizing wheel assembly comprises a mounting frame, a synchronizing wheel pair and an elastic connecting assembly, one end of the elastic connecting assembly transversely passes through the synchronizing wheel pair and is connected with one side wall of the mounting frame, and the other end of the elastic connecting assembly is connected with the other side wall of the mounting frame. And the synchronous wheel pair is in sliding fit with the elastic connecting piece. According to the self-adaptive synchronous wheel assembly, the elastic band of the synchronous belt can be adjusted, meanwhile, the phenomenon that the synchronous belt shakes in the rotating and reversing process can be avoided, and the tightness can be adjusted in a self-adaptive mode.

The utility model discloses an electromagnetic heating hot melting device, including the electromagnetic coil support, high frequency electromagnetic induction coil is wound on the electromagnetic coil support for producing high frequency alternating magnetic field under the action of high frequency pulse current, nozzle, the nozzle sets up in the magnetic field action area of high frequency electromagnetic induction coil for generating eddy current and spontaneous heating through electromagnetic induction. The utility model discloses adopts electromagnetic induction eddy current heating principle, and the heat is directly generated in the nozzle inside, and does not need traditional heat conduction process, realizes the rapid temperature rise of second level, and the printing preparation time is greatly shortened.

The utility model relates to ceramic printing processing technical field, and disclose a kind of multi-color printing device for daily-use ceramic, including base, the side surface of base is provided with the printing structure for automatically continuous printing processing to ceramic, the outside of base is provided with air pump, the inside bottom of base is fixed with servo motor, the output of servo motor is fixed with carousel, the inside surface of base is fixed with bracket, the outside of bracket is fixed with outer air inlet pipe, the inside of bracket is fixed with hollow fixed ring, the carousel is provided with the clamping structure for the ceramic fast fixing. The multi-color printing device for daily-use ceramic, by placing ceramic on carousel, and by holding structure can quickly ceramic stable clamping and fixing, then by printing structure can continuously printing processing to ceramic, improve the efficiency of multi-color printing processing to ceramic.

The invention discloses a circular ink supply intelligent control method and system based on a UV printer, and the method comprises the steps: S1, collecting a digital image file of a to-be-printed task, and obtaining the consumption prediction data of ink of each color through the analysis of pixel information; s2, based on the consumption prediction data, obtaining a flow demand through a Poiseuille law fluid dynamic conversion algorithm, and based on the flow demand, constructing an ink supply control regression model to carry out ink supply coupling feed-forward calculation to obtain a feed-forward control parameter set; s3, constructing a self-learning database for input comparison, and adjusting and optimizing the feedforward control parameter set based on unscented Kalman filtering according to the historical control effect deviation to generate a final control instruction; and S4, intelligent control over circulating ink supply is conducted on an execution mechanism of the circulating ink supply system based on the final control instruction, the color rendition degree and consistency of a printed picture are improved, and the operation cost is reduced while the ink supply quality is guaranteed.

This invention proposes a method and system for intelligent ink volume prediction and adaptive color correction in printing equipment. The method includes: acquiring image data of the page to be printed, performing region segmentation and neighborhood connectivity analysis to generate a structure-weighted effective ink density, and calculating a page-level ink volume prediction value in conjunction with a paper correction factor; mapping the ink volume prediction value and effective ink density to the printhead's basic jetting parameters and the scanning controller's structural constraint parameters; performing linear gain and nonlinear convergence processing on the original color channel values ​​based on the above parameters to generate corrected channel values; driving the printhead to print, and sampling the printed scanned tape using a linear optical acquisition unit; and performing residual compensation and convergence constraint correction on the execution values ​​of subsequent scanned tapes based on the difference between the measured values ​​and the target values. This invention can improve the consistency and accuracy of printed colors.

The utility model discloses a kind of quick solidification devices of ink-jet printer, comprising: printing table, mounting plate, installation component, guide component, driving assembly, printing component and heating component, installation component is installed on printing table, mounting plate, guide component and driving assembly are all installed on installation component, printing component and heating component are all installed on mounting plate, driving assembly connects guide component, guide component connects mounting plate, mounting plate is located on the first plane parallel with printing table, installation component is located on the second plane parallel with first plane, driving assembly can drive mounting plate to move on the first plane or between second plane and printing table any third plane parallel with first plane.The utility model can heat solidification to new ink jetting in time, avoid pattern blur or stain, significantly improve ink-jet printing quality.

Embodiments of the present application disclose a color matching method and device, electronic equipment, a storage medium and a program product. The color matching method comprises: when it is detected that toner of an image forming device cannot present a target color of an image, taking at least one visual characteristic as a numerical constraint condition of an optical color space, generating at least one alternative color of the image, and making the alternative color consistent with the target color in the visual characteristic; and determining a printing color matching of the image based on the alternative color selected by a user. The embodiments of the present application can improve the image printing quality.