CN110450558B - Wide color gamut printing process and method - Google Patents
Wide color gamut printing process and method Download PDFInfo
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- CN110450558B CN110450558B CN201910651244.9A CN201910651244A CN110450558B CN 110450558 B CN110450558 B CN 110450558B CN 201910651244 A CN201910651244 A CN 201910651244A CN 110450558 B CN110450558 B CN 110450558B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
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Abstract
The invention discloses a wide color gamut printing process and a method, wherein the printing process comprises the following steps: a precoating printing step of printing a precoating layer on the surface of a recording medium; a base printing step of printing a base image on the precoat layer; a compensation printing step of printing a compensation image on the base image, the compensation image having a color gamut different from that of the base image. Through with the used printing ink colour's of basic image printing colour gamut is different printing compensation image on the basic image, it can realize the mixture of multiple different colour gamuts, realizes the printing of wider colour gamut, improves the colour effect and the visual quality of image.
Description
Technical Field
The invention relates to the field of printing, in particular to a wide color gamut printing process and a wide color gamut printing method.
Background
Inkjet printing is widely used in many different fields to produce printed images in various recording media. In conventional color ink jet printing, a so-called "full color printing" is formed by mixing and superimposing four colors in total by using the principle of color mixing of three primary colors of coloring materials and black ink.
These four basic colors: cyan (Cyan), Magenta (Magenta), Yellow (Yellow), and blacK (blacK), and are referred to as CMYK color groups. In use, the required colour pattern is produced by combining different doses of the various basic colours. However, the CMYK color combinations are limited greatly, the range of the color gamut that can be formed is not large, the CMYK colors are actually different from the desired colors after being combined, the image effect is general, and the image with high visual quality requirements cannot be realized, and the color effect of the image formed by the existing CMYK color combinations is poor, and the visual quality is general.
Disclosure of Invention
Compared with the conventional color ink-jet printing, the wide color gamut printing process and the wide color gamut printing method can print colors with wider color gamut by printing the compensation image with the color gamut different from that of the basic image on the printed basic image, and improve the color effect and the visual quality of the target image.
In view of this, a first aspect of the embodiments of the present invention provides a wide color gamut printing process, including:
a precoating printing step of printing a precoating layer on the surface of a recording medium;
a base printing step of printing a base image on the precoat layer;
a compensation printing step of printing a compensation image on the base image, the compensation image having a color gamut different from that of the base image.
Further, before the basic printing step, the printing process further includes:
and a white bottom printing step of printing a white bottom layer on the precoat layer.
Further, after the compensating printing step, the printing process further includes:
and a gloss oil printing step of printing a gloss oil layer on the base image and the compensation image.
Further, after the compensating printing step and before the gloss oil printing step, the printing process further includes:
a metallic color printing step of printing a metallic color image on the base image and/or the compensation image.
Further, the printing process further includes:
and a drying step, corresponding to the pre-coating printing step, the white bottom printing step, the basic printing step, the compensation printing step, the metal color printing step and the gloss oil printing step respectively, for curing the pre-coating layer and the gloss oil layer respectively and at least partially curing the white bottom layer, the basic image, the compensation image and the metal color image.
Further, a second aspect of the present invention provides a wide color gamut printing method comprising:
acquiring a target image;
determining a compensation image of the target image;
determining a compensation path according to the compensation image;
printing the compensated image through the compensation path.
Further, the determining a compensation path according to the compensation image includes:
determining a starting position;
acquiring a compensation position set on the compensation image;
and determining the compensation path according to the starting position and the compensation position set.
Further, the determining the compensation path according to the starting position and the set of compensation positions includes:
and searching the compensation position with the shortest distance to the initial position in the compensation position set, and searching the next compensation position with the shortest distance to the initial position by using the compensation position until the last compensation position in the compensation position set is found.
Further, the compensation path starts from the starting position, and the path direction of the compensation path at least comprises a first direction and a second direction;
the determining the compensation path from the starting location and the set of compensation locations comprises:
dividing the set of compensated positions into a first set of compensated positions and a second set of compensated positions according to the first direction and the second direction, the first set of compensated positions being located at one side of the starting position in the first direction, the second set of compensated positions being located at one side of the starting position in the second direction;
determining that the compensation path moves in the first direction or the second direction according to the weights of the first compensation position set and the second compensation position set;
the first set of compensated positions is weighted in association with a distance of each compensated position in the first set of compensated positions from the starting position in the first direction, and the second set of compensated positions is weighted in association with a distance of each compensated position in the second set of compensated positions from the starting position in the second direction.
Further, before printing the compensation image through the compensation path, the method includes:
determining a base image of the target image, the base image having a different color gamut than a compensation image;
printing a base image from the base image.
A third aspect of the present invention provides a wide color gamut printing apparatus comprising:
an acquisition unit configured to acquire a target image;
a first determination unit configured to determine a compensation image of the target image;
a second determining unit for determining a compensation path according to the compensation image;
a first printing unit for printing the compensation image through the compensation path.
Further, the second determination unit includes:
a first determining subunit, configured to determine a starting position;
an obtaining subunit, configured to obtain a compensation position set on the compensation image;
a second determining subunit, configured to determine the compensation path according to the starting position and the set of compensation positions.
Further, the second determining subunit is specifically configured to:
and searching the compensation position with the shortest distance to the initial position in the compensation position set, and searching the next compensation position with the shortest distance to the initial position by using the compensation position until the last compensation position in the compensation position set is found.
Further, the compensation path starts from the starting position, and the path direction of the compensation path at least comprises a first direction and a second direction;
the second determining subunit is specifically configured to:
dividing the set of compensated positions into a first set of compensated positions and a second set of compensated positions according to the first direction and the second direction, the first set of compensated positions being located at one side of the starting position in the first direction, the second set of compensated positions being located at one side of the starting position in the second direction;
determining that the compensation path moves in the first direction or the second direction according to the weights of the first compensation position set and the second compensation position set;
the first set of compensated positions is weighted in association with a distance of each compensated position in the first set of compensated positions from the starting position in the first direction, and the second set of compensated positions is weighted in association with a distance of each compensated position in the second set of compensated positions from the starting position in the second direction.
Further, the printing apparatus includes:
a third determining unit configured to determine a base image of the target image, the base image having a color gamut different from that of the compensation image;
a second printing unit for printing a base image based on the base image.
A fourth aspect of the present invention provides a wide color gamut printing system comprising:
a precoating printing module for printing a precoating layer on a surface of a recording medium;
a base printing module for printing a base image on the precoat layer;
a compensation printing module to print a compensation image on the base image, the compensation image having a color gamut different from that of the base image.
Further, the printing system further includes:
and the white bottom printing module is used for printing a white bottom layer on the pre-coating layer.
Further, the printing system further includes:
and the gloss oil printing module is used for printing a gloss oil layer on the base image and the compensation image.
Further, the printing system further includes:
a metallic color printing module to print a metallic color image on the base image and/or the compensation image.
Further, the printing system further includes:
and the drying module is used for respectively curing the precoating layer and the gloss oil layer, and at least partially curing the white bottom layer, the basic image, the compensation image and the metal color image.
The fifth aspect of the embodiments of the present invention also provides a wide color gamut printing apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the wide color gamut printing method of any one of the second aspects above.
A sixth aspect of embodiments of the present invention provides a non-transitory computer-readable storage medium having stored thereon computer-executable instructions for causing a wide color gamut printing device to execute the wide color gamut printing method according to any one of the second aspects described above.
A seventh aspect of embodiments of the present invention provides a product printed according to the wide color gamut printing method as described in any one of the second aspects above.
An eighth aspect of embodiments of the present invention provides a product printed according to the wide color gamut printing process of any one of the first aspects above.
According to the technical scheme, the embodiment of the invention has the following advantages:
in the embodiment of the invention, the final target image is obtained by printing a precoating layer on the surface of the recording medium, then printing a basic image on the precoating layer, and then printing a compensation image with a color gamut different from that of the basic image on the basic image through compensation printing. Therefore, the ink with the color gamut different from that of the ink used for printing the basic image is used for printing the compensation image on the basic image, and the combination, the superposition or the mixing of multiple color gamuts can be realized, so that the printing of wider color gamut is realized, and the aims of improving the color effect and the visual quality of the target image are fulfilled. In addition, the precoat layer printed on the surface of the recording medium can better realize that the subsequent printing ink is better attached to the recording medium and is not unstably scattered randomly.
Drawings
FIG. 1 is a schematic diagram of a prior art color gamut image;
FIG. 2 is a schematic diagram of an embodiment of a wide color gamut printing process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a CMYK nozzle in an embodiment of the present invention;
FIG. 4 is a schematic view of an embodiment of the present invention incorporating multiple sets of nozzles;
fig. 5 is a schematic diagram of another embodiment of a wide color gamut printing flow in the embodiment of the present invention;
fig. 6 is a schematic diagram of another embodiment of a wide color gamut printing flow in the embodiment of the present invention;
fig. 7 is a schematic diagram of an embodiment of a wide color gamut printing method in the embodiment of the present invention;
fig. 8 is a schematic diagram of an embodiment of step S230 in the wide color gamut printing method in the embodiment of the present invention;
FIG. 9 is a schematic diagram of an embodiment of quantizing a target image into planar coordinates according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of an embodiment of a unit for determining a compensated position according to an embodiment of the present invention;
fig. 11 is a schematic diagram of an embodiment of a wide color gamut printing apparatus 300 in the embodiment of the present invention;
fig. 12 is a schematic diagram of an embodiment of the second determination unit 330 in the wide color gamut printing apparatus 300 according to the embodiment of the present invention;
FIG. 13 is a schematic diagram of one embodiment of a wide gamut printing system 400 in an embodiment of the present invention;
fig. 14 is a schematic diagram of an embodiment of a printing apparatus 500 in the embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a wide color gamut printing process and a wide color gamut printing method, which can print colors with wider color gamut and improve the color effect and the visual quality of a target image.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be described in more detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, the Lab color gamut is a color gamut of all colors theoretically visible to the human eye, and is a color system based on the physiological characteristics of the human eye, which is independent of the device, and does not depend on light or pigments, and because of this, the colors of the Lab color gamut cannot be completely represented by the display or the pigments.
In fig. 1, a dotted line frame shows an RGB color gamut, which is a color standard most widely used in industrial design, and obtains various colors by changing three color channels of Red (Red), Green (Green), and Blue (Blue) and superimposing the three color channels with each other, wherein RGB represents three primary colors of light (Red, Green, and Blue); the thick line boxes show the CMYK color gamut, which is a standard for printing colors that is conventional in industrial production. In industrial production, an image on a product needs to be designed by a computer before printing can be produced.
However, since the pigment absorbs light and does not superpose light, the color gamut of the image printed by the pigment is actually smaller than that of the image fed back by the electronic computer through the display, and the CMYK color gamut of the printing color standard is actually a subset of the RGB color gamut of the industrial design color standard, and the range of the CMYK color gamut is smaller than that of the RGB color gamut. The image printed by the conventional printing means is not only different from the color gamut of the image designed in the computer, but also has a significant color gamut blank from the image visible to the naked eye, as shown in the blank region between the CMYK color gamut and the Lab color gamut shown in fig. 1.
In order to improve the color effect and visual quality of the image printed by the conventional printing means CMYK mode in the prior art, namely, the color gamut of the color of the printing target image is improved. Taking inkjet printing as an example, as shown in fig. 2, an embodiment of a wide color gamut printing process according to an embodiment of the present invention includes:
s101, printing a precoat layer;
inkjet printing is the spraying of a colored liquid ink through a nozzle into fine particles onto a recording medium (such as paper), and the quality of the printed image is generally dependent on the printing resolution, i.e., DPI value, of this inkjet printing. DPI (Dots Per Inch) is an important unit of measurement, which refers to the number of Dots that can be printed by an inkjet printer Per Inch, and generally speaking, higher DPI values indicate higher printing precision and higher printing resolution of inkjet printing.
Another important factor affecting image quality is the absorption of the recording medium, which should be closely symmetrical when the ink is ejected onto the paper. If the ink is absorbed and spread by the paper, the area of the ink dot is larger than expected, resulting in a target image that appears more blurred.
In order to overcome this problem, the present embodiment allows the subsequent ink to be sprayed onto the recording medium better without the ink being scattered randomly and unstably, and a pre-coat layer is printed on the surface of the recording medium to improve the spraying effect.
Different from the traditional mode, traditional precoating coats the precoating on recording medium through the cylinder, and not only complex operation and thickness are not good to be held, can only full version coating on recording medium moreover, and extravagant very big to the roughness requirement of medium printing face is higher, still has the cylinder when rolling and the phenomenon that the recording medium adhesion is in the same place, has seriously influenced the printing of follow-up printing ink.
In contrast, in the present embodiment, the precoat layer is printed on the surface of the recording medium by the spray method, and there is no problem of contact with the recording medium, and therefore, there is no requirement for the flatness of the printed surface of the recording medium. And through the jet-propelled volume of control nozzle, the printing thickness of the precoat layer of control that can also be accurate avoids extravagant.
In a preferred embodiment, the pre-coat layer can be precisely controlled within the target image area to be printed, i.e. precisely sprayed on the surface of the recording medium corresponding to the size and position of the target image to be printed, thereby reducing unnecessary waste.
It is to be understood that the recording medium may include, but is not limited to, paper, leather, metal, glass, ceramic, plastic, wood, and other materials. It will also be appreciated that the composition of the precoat may be different recording media, with one material recording media corresponding to one composition precoat, and is not particularly limited herein.
S102, printing a basic image;
in this embodiment, a base image may be printed on the precoat layer, i.e. by a conventional printing means CMYK, specifically by spraying cyan, magenta, yellow and black respectively through three or four nozzles. Of course, a scheme of sharing one head may also be adopted, and multiple sets of nozzles are arranged in one head, which correspond to cyan C, magenta M, yellow Y, and black K, respectively, as shown in fig. 3, each set of CMYK may include 16 nozzles, that is, 4 sets of 16 nozzles, that is, 64 nozzles are arranged in one head.
The multi-nozzle mode is adopted because: the conventional design is to jet ink only when printing is needed, namely random ink jet, and compared with continuous ink jet, the random ink jet has the advantages of simple structure, lower cost and higher reliability, so the random ink jet is widely adopted; however, the ink droplet ejection speed is reduced due to the inertia of the jet, and in order to compensate for this, a multi-nozzle combination method is used to increase the printing speed.
It is understood that each set of nozzles integrated in a single showerhead may not be limited to 16, and 16 are illustrated here for illustrative purposes.
Moreover, the ink jet mode adopted by each nozzle can be a micro-piezoelectric type, and ink drops are pushed out by controlling the contraction of a piezoelectric element; the ink jet head may be of a thermal bubble type, and ink droplets may be ejected by heating, expanding, and compressing the ink in a short time, which is not limited herein.
S103, printing a compensation image;
the base image printed in the above-described base printing step is an image of cyan, magenta, yellow, black, or a combination color thereof printed by CMYK inks. Since the CMYK gamut is not only smaller than the RGB gamut of the display, but also much smaller than the Lab gamut visible to the human eye, the images printed with CMYK inks actually differ greatly from the desired colors seen by the human eye.
In this regard, in this embodiment, a compensation printing step is added in addition to the base image printed with the CMYK inks, i.e., a compensation image is printed over the base image.
It will be appreciated that the compensation color of the printed compensation image may be a color of a gamut other than CMYK colors (cyan, magenta, yellow, black), for example, one or more colors selected from purple, orange, green, cyan, magenta, and so on, and may be selected according to the requirements of the target image to be actually printed.
In this embodiment, the compensation color may be provided by one nozzle for each color, or the compensation color may be provided by a nozzle (i.e., at least two nozzles) different from the CMYK colors, or may be integrated into one nozzle, as shown in fig. 4, where multiple groups of nozzles are integrated into one nozzle, where P is1、P2、P3Etc. i.e. corresponding to different compensating colors, respectively. Of course, in the one nozzle head integrating multiple groups of nozzles, the arrangement and combination manner thereof is not limited to that shown in fig. 4, and the nozzles arranged horizontally may also be arranged vertically or arranged in a matrix form, which is not limited herein.
In this embodiment, the printed compensation image may be printed over the base image or may be printed in a blank area of the base image. That is, the compensation color different from the CMYK color gamut may be printed separately on the recording medium, or the compensation color may be printed over the CMYK color, and the colors of the other color gamut may be blended with the CMYK color to realize wider color gamut printing.
And S104, printing a gloss oil layer.
In this embodiment, the base image and the compensation image printed in the foregoing steps form a final target image, and a gloss oil layer may be printed on the target image, where the gloss oil layer may play a role of waterproof and moistureproof for the target image, may also isolate air, avoid oxidation and deterioration of ink, and may also ensure glossiness of the target image, so that visual quality thereof is more comfortable.
In addition, some local gloss oil in the embodiment can play a special effect of highlighting local parts.
According to the embodiment of the invention, the compensation images of other color gamut colors are printed on the base image printed by CMYK in a compensation way, so that the combination, superposition and mixing of various color gamut colors can be realized, the printing of a wide color gamut is realized, and the color effect and visual quality of the printing of the target image are improved.
In some embodiments of the present invention, there may be step S105 between step S101 and step S102, as shown in fig. 5, another embodiment of a wide color gamut printing flow in embodiments of the present invention includes:
and S105, printing a white bottom layer.
A white under layer may be printed on the surface of the pre-coat layer by a white under ink before printing a base image of CMYK colors. The white bottom layer can be printed to improve the contrast of the basic image and the compensation image printed by the subsequent ink, so that the color contrast is clear, and the white bottom layer is printed when the white bottom is required by individual special products.
It is understood that the white base ink may be a single head, or may be integrated with a head for basic printing and compensation printing, and the printing nozzle of the white base ink is integrated in one head, which is not limited herein.
The white base layer can also be sprayed on the surface of the recording medium accurately corresponding to the size and position of the target image to be printed.
In some embodiments of the present invention, a step S106 may also be provided between step S103 and step S104 as needed, and as shown in fig. 6, another embodiment of a wide color gamut printing flow in an embodiment of the present invention includes:
and S106, printing the metal color image.
Before printing the covering varnish layer, a metallic color surface treatment may be performed on the finally printed target image, and a metallic color image (which may also be referred to as a metallic color ink layer) is sprayed on the target image through a metallic color ink.
The metallic ink can be used for selecting golden, silver, space gray, aluminum alloy golden and the like according to actual requirements, and is printed at a specific position or in the whole covering mode on the target image, so that the printed target image has more characteristics, and the technological sense is enhanced.
It should be noted that, the metallic ink may also adopt a single nozzle, or further may be integrated with nozzles for white background printing, basic printing, and offset printing, and is not limited herein.
It should be noted that the printing process further includes a drying step, which corresponds to the pre-coat printing step, the white background printing step, the basic printing step, the compensation printing step, the metallic color printing step, and the gloss oil printing step, respectively, for curing the pre-coat layer and the gloss oil layer, and at least partially curing the white background layer, the basic image, the compensation image, and the metallic color image. In the embodiment of the present invention, after the pre-coating layer is formed in step S101, a drying process may be performed to stably apply the pre-coating layer on the recording medium. In addition, after each color ink is sprayed or after several color inks are continuously sprayed in step S102, step S103, step S105, and step S106, the ink layer (image) may be primarily dried to at least partially cure the printed ink layer, and then the ink layer (image) may be completely dried to completely cure the printed ink layer before the gloss oil layer is coated in step S104. And then, after the glazing oil layer is coated in the step S104, final drying is carried out to obtain a final product. Through scribbling the gloss oil layer again after drying finally/solidifying printing ink layer (image), avoid when drying together because the shelves that separate of gloss oil layer lead to the stoving of printing ink layer (image) not thorough, can guarantee final gloss oil layer's dampproofing and waterproofing, isolated protection effect.
The specific drying method may depend on the properties of the ink, and if the ink is a UV ink, the ink is cured by ultraviolet light irradiation, and if the ink is a water-based ink, the ink is dried by infrared light, hot air, superheated steam, and the like, and the properties of the ink are not limited herein.
In the corresponding embodiment of the present invention, based on the embodiments shown in fig. 2 to fig. 6, referring to fig. 7, regarding the printing of the target image, an embodiment of a wide color gamut printing method according to the embodiment of the present invention includes:
s210, acquiring a target image;
in this embodiment, an image may be printed by a printing device controlling a nozzle (nozzle) to eject ink droplets, and before printing, the printing device may acquire a target image to be printed, for example, by means of data reception.
S220, determining a compensation image of the target image;
after the target image is acquired by the printing device, the target image may be analyzed to analyze the color gamut to which the colors in the target image belong, so as to determine the region belonging to the CMYK color gamut and the region belonging to the region outside the CMYK color gamut in the target image.
It is understood that, in the target image, the region belonging to the CMYK color gamut, i.e., the base image, and the region belonging to the CMYK color gamut other than the CMYK color gamut, i.e., the compensation image.
And after determining the compensation image, the printing apparatus may further determine each compensation color required to print the compensation image.
S230, determining a compensation path according to the compensation image;
it should be understood that the number of compensation images analyzed from the target image is generally plural and is unevenly distributed on the target image.
Therefore, in this embodiment, in order to reduce the time taken to print the compensation image, a compensation path can be planned to print the compensation image that is not uniformly distributed on the target image.
It can be understood that, according to the different distribution positions of the compensation images on the target image, a compensation path connecting all the compensation images can be planned in a horizontal or longitudinal layer-by-layer printing mode different from the prior art, so that the compensation path does not need to pass through all the target images, the time spent by the spray head (nozzle) in moving is reduced, and the printing efficiency is improved.
And S240, printing the compensation image through the compensation path.
In this embodiment, the printing apparatus may control the head (nozzle) to move according to the determined compensation path, and print the compensation image.
Note that the printing apparatus may print the base image of the CMYK color gamut in advance before printing the compensation image, and then print the compensation image using the compensation color on top of the base image.
It will be appreciated that the printing device may print the base image in an existing lateral or longitudinal layer-by-layer printing manner. Of course, if the area ratio of the basic image obtained by the printing device is smaller than the preset value when analyzing the target image to be printed, the basic path for printing the basic image may be determined according to the method described in step S230, and printing may be performed according to the basic path to improve the printing efficiency.
The preset value of the area ratio preset in the printing apparatus may be specifically adjusted by the user according to the actual production demand, for example, set to 30%. When the detection analysis result is less than 30%, that is, the ratio of the compensation image exceeds 70%, the printing device can set the compensation path for printing the compensation image to be a conventional printing mode by itself, that is, the compensation image is printed in a horizontal or longitudinal layer-by-layer printing mode, so that the printing device is prevented from executing excessive unnecessary calculation processes, and the production efficiency is enhanced.
In the embodiment of the invention, the compensation paths connecting all the compensation images are planned according to the distribution positions of the compensation images on the target image by analyzing the basic images contained in the target image and the compensation images to be compensated corresponding to the basic images, so that the aims of reducing the moving time of a spray head (nozzle), reducing the time required by spraying the compensation images and improving the printing efficiency are fulfilled.
Step S230 in the embodiment of the present invention is explained below by way of example. Referring to fig. 8, based on the embodiment shown in fig. 7, step S230 in an embodiment of a wide color gamut printing method according to an embodiment of the present invention includes:
s231, determining a starting position;
in this embodiment, the printing apparatus may use the upper left corner, the upper right corner, the lower left corner, or the lower right corner of the target image as the initial position of the initial printing.
In some embodiments, the starting position may also be in the middle of the target image, and is not limited herein.
S232, acquiring a compensation position set on the compensation image;
in this embodiment, the printing apparatus may determine coordinates of each compensation image with respect to the start position as the origin coordinates to obtain a coordinate set, i.e., a compensation position set.
And S233, determining a compensation path according to the starting position and the compensation position set.
In this embodiment, with the start position as the start end of the compensation path, the printing apparatus may determine the searched path as the compensation path by searching for a compensation position having the shortest distance from the start position in the set of compensation positions, and searching for a next compensation position having the shortest distance from the new start position with the compensation position until the last compensation position in the set of compensation positions is found.
Specifically, the path direction of the compensation path at least includes a first direction and a second direction, taking an upper left corner as an example of a starting position, the first direction is a direction from the starting position to the right, and the second direction is a direction from the starting position to the lower; taking the lower right corner as an initial position, the first direction is an upward direction, and the second direction is a leftward direction. Specifically, the first direction and the second direction are different corresponding to different starting positions, and when the starting position is set at the middle position of the target image, the compensation path associated therewith may further include a third direction and a fourth direction, which are not limited herein.
On the basis of the first direction and the second direction of the compensation path, the compensation position sets can be divided into a first compensation position set and a second compensation position set according to the first direction and the second direction, wherein the first compensation position set is a compensation position set located on one side of the starting position in the first direction, and the second compensation position set is a compensation position set located on one side of the starting position in the second direction.
It should be noted that, in this embodiment, the compensation path may be determined to move to the first direction or to move to the second direction according to the weights of the first compensation position set and the second compensation position set. The weight of the first set of compensated positions is associated with the distance of each compensated position in the first set of compensated positions from the starting position in the first direction, and the weight of the second set of compensated positions is associated with the distance of each compensated position in the second set of compensated positions from the starting position in the second direction.
Taking the example shown in fig. 9 as an example, the target image is quantized into the coordinates of a plane, and the coordinates of the start position are set to (0, 0), then the association relationship between the weight of the first (second) compensation position set and the distance between each compensation position and the start position in the first (second) direction may refer to the magnitude of the value of the coordinate (X, Y) of each compensation position on the X axis or the Y axis, that is, the X axis may correspond to the first direction, and the second direction may correspond to the Y axis.
In fig. 9, assuming that the compensation positions are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, the corresponding coordinates are (2, 2), (3, 3), (2, 3), (7, 3), (8, 3), (1, 6), (1, 7), (5, 7), (6, 7), (5, 8), (6, 10), the weight of the first direction is 49 and the weight of the second direction is 61 can be calculated.
In this embodiment, in order to reduce the movement distance, the user moves to the compensation position closest to the movement distance, and therefore, the user may default to move to the smaller weight direction, for example, the compensation path of the movement is determined by the first direction with the smaller weight of 49 as compared with the second direction with the weight of 61.
Of course, assuming that the compensation positions are n, the weight of the first direction or the weight of the second direction can be calculated by the following summation calculation formula:
wherein a may refer to the X-axis or the Y-axis, i.e. a1Can be X1Or Y is1。
It should be understood that, in the present embodiment, the summation calculation is taken as an example to illustrate how the printing apparatus plans the compensation path, but the present invention should not be limited thereto, and in other embodiments of the present invention, the weights of the first direction and the second direction may be calculated by a method other than the summation calculation, which is not limited herein.
As shown in fig. 9, when the printing apparatus determines that the first direction weight is smaller than the second direction, i.e., the compensation path is moved from the start position 0 to the first direction (X-axis direction) and then to the second direction (Y-axis direction), the compensation path is planned to the compensation position 1.
After that, the printing apparatus can again find the next compensation position closest to the starting position by taking the compensation position 1 as the starting position. Since the compensation positions 1, 2, 3, 4 are close to each other, the compensation path planned in the close compensation positions can be in a conventional printing manner, i.e., laterally layer by layer (1234) or longitudinally layer by layer (1432), and the same applies to the close compensation positions (5, 6), (7, 8) and (9, 10, 11) shown in fig. 9.
Assuming that the compensation path is cut off to the compensation position 4, the compensation position 4 is used as a new starting position to find a compensation position with the shortest distance, and the specific method can be the same as the calculation method from the starting position 0 to the compensation position 1. Of course, the compensation path at this time also has a third set of compensation positions 7 and 8 in a third direction, i.e., the-X direction, at the compensation position 4. But it does not affect the calculation of the new weights for the first direction, the second direction and the third direction at this time, and continuing with fig. 9 as an example, the coordinates of the compensation positions 5, 6, 7, 8, 9, 10, 11, 12 at this time are (7-2, 3-3), (8-2, 3-3), (1-2, 6-3), (1-2, 7-3), (5-2, 7-3), (6-2, 7-3), (5-2, 8-3), (6-2, 10-3), i.e. the new coordinates (5, 0), (6, 0), (1, 3), (1, 4), (3, 4), (4, 4), (3, 5), (4, 7), respectively.
In the above, the weight of the third direction of the-X axis is calculated as | -2|, and the weight of the first direction is calculated as 25 and the weight of the second direction is calculated as 27. Taking their absolute values, the weight of the third direction is found to be at least 2. Therefore, the compensation position 7 of the compensation path can be planned by moving to the-X axis direction (third direction) and then moving to the Y axis direction (second direction) in the planned compensation path. After that, the compensation position 7 is used as a new starting position to continuously search the next compensation position with the shortest distance until the compensation path links all compensation positions. Of course, the weight of the fourth direction, which may occur therein, may be calculated with reference to the third direction, which is not exhaustive here.
In a preferred embodiment, taking fig. 10 as an example, when the printing device processes the analysis target image, a range of compensation positions may be included as a compensation position unit, for example, as shown by a dotted line in fig. 10, when the compensation position 1 is determined to be the closest position, the compensation position unit where the compensation position 1 is printed may be planned in a horizontal layer-by-layer manner (123456) or a vertical layer-by-layer manner (561423 or 234165), and accordingly, the calculation workload of the printing device in planning the compensation path may be reduced.
It will be appreciated that the range of the offset location unit may be specifically set by the user according to the actual printing requirements, for example, offset locations (56) spaced less than 2 away from the offset location (1234) that are close to each other may be combined into one offset location unit as shown in fig. 10. It should be understood that the compensation position unit may include a plurality of units in the target image, that is, a plurality of compensation position units may be included in the compensation position set.
In the embodiment of the invention, a starting position point is set, a compensation path taking the starting position as a starting point is calculated, the moving direction from the starting position to the compensation position with the shortest distance is determined by judging the weights in the first direction and the second direction of the current starting position, a compensation path with less distance compared with a transverse or longitudinal layer-by-layer printing mode in the prior art is planned, and the compensation path is used for controlling the movement of a spray head (nozzle), so that the aims of reducing the time required by spraying the compensation image and improving the printing efficiency are fulfilled.
As described above, referring to fig. 11, the device structure of the printing device of the embodiment shown in fig. 7 to 10, an embodiment of a wide color gamut printing device 300 according to the embodiment of the present invention includes:
an acquisition unit 310 for acquiring a target image;
a first determining unit 320 for determining a compensation image of the target image;
a second determining unit 330 for determining a compensation path according to the compensation image;
a first printing unit 340 for printing the compensated image through the compensation path.
Further, as shown in fig. 12, in some embodiments of the present invention, the second determining unit 330 may include:
a first determining subunit 331 configured to determine a start position;
an obtaining subunit 332, configured to obtain a compensation position set on the compensation image;
a second determining subunit 333, configured to determine the compensation path according to the starting position and the set of compensation positions.
Further, in some embodiments of the present invention, the second determining subunit 333 may specifically be configured to:
and searching the compensation position with the shortest distance to the initial position in the compensation position set, and searching the next compensation position with the shortest distance by taking the compensation position as the initial position until the last compensation position in the compensation position set is searched.
Further, in some embodiments of the present invention, the compensation path starts from a start position, and the path direction of the compensation path includes at least a first direction and a second direction;
the second determining subunit 333 may specifically be configured to:
dividing the compensation position set into a first compensation position set and a second compensation position set according to the first direction and the second direction, wherein the first compensation position set is positioned on one side of the starting position in the first direction, and the second compensation position set is positioned on one side of the starting position in the second direction;
determining the compensation path to move towards the first direction or the second direction according to the weights of the first compensation position set and the second compensation position set;
the weight of the first set of compensated positions is associated with the distance of each compensated position in the first set of compensated positions from the starting position in the first direction, and the weight of the second set of compensated positions is associated with the distance of each compensated position in the second set of compensated positions from the starting position in the second direction.
Further, in some embodiments of the present invention, the printing apparatus 300 may further include:
a third determining unit 350 for determining a base image of the target image, the base image being different from a color gamut to which colors of the compensation image belong;
a second printing unit 360 for printing the base image based on the base image.
It should be noted that the printing apparatus 300 can execute the wide color gamut printing method provided by the embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. For details of the technique that are not elaborately described in the embodiment of the printing apparatus 300, reference may be made to the wide color gamut printing method provided in the embodiment of the present invention, and details thereof are not repeated here.
An embodiment of the present invention further provides a printing system 400 based on the embodiments shown in fig. 2 to 11, please refer to fig. 13, where an embodiment of a wide color gamut printing system 400 according to the embodiment of the present invention includes:
a precoat printing module 410 for printing a precoat layer on a surface of a recording medium;
a base printing module 420 for printing a base image on the pre-coat layer;
a compensation printing module 430 for printing a compensation image on the base image, the compensation image having a different color gamut than the base image.
Further, in some embodiments of the present invention, the printing system 400 may further include:
and a white background printing module 440 for printing a white background on the pre-coat layer.
Further, in some embodiments of the present invention, printing system 400 may further include:
and a gloss oil printing module 450 for printing a gloss oil layer on the base image and the compensation image.
Further, in some embodiments of the present invention, printing system 400 may further include:
a metallic color printing module 460 for printing a metallic color image on the base image and/or the compensation image.
Further, in some embodiments of the present invention, printing system 400 may further include:
a drying module 470 for curing the precoat and varnish layers, respectively, and at least partially curing the white underlayer, base image, compensation image, and metallic color image.
It should be understood that the printing system 400 described above can execute the wide color gamut printing process provided by the embodiment of the present invention, and the wide color gamut printing method therein, and has the corresponding functional modules and beneficial effects of the execution method. For the technical details that are not described in detail in the embodiment of the printing system 400, reference may be made to the wide color gamut printing flow and the wide color gamut printing method provided in the embodiment of the present invention, and details are not described here again.
As another aspect of the embodiments of the present invention, embodiments of the present invention provide a printing apparatus, as shown in fig. 14, the printing apparatus 500 including: one or more processors 51 and memory 52. In fig. 14, one processor 51 is taken as an example.
The processor 51 and the memory 52 may be connected by a bus or other means, and fig. 14 illustrates the connection by a bus as an example.
The memory 52, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the wide color gamut printing method in any of the embodiments of the present invention described above. The processor 51 executes various functional applications and data processing of the printing apparatus based on the wide color gamut printing method by running the nonvolatile software program, instructions and modules stored in the memory 52, that is, the functions of the various modules of the wide color gamut printing method and apparatus embodiments provided by the above-described method embodiments are realized.
The memory 52 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The program instructions/modules described are stored in the memory 52 and, when executed by the one or more processors 51, perform the wide gamut printing method of any of the method embodiments described above.
Embodiments of the present invention also provide a non-transitory computer storage medium storing computer-executable instructions for execution by one or more processors, such as the one processor 51 in fig. 14, to cause the one or more processors to perform the method of wide color gamut printing in any of the above method embodiments.
Embodiments of the present invention also provide a computer program product comprising a computer program stored on a non-volatile computer-readable storage medium, the computer program comprising program instructions that, when executed by a printing device, cause the printing device to perform the wide color gamut printing method in any of the above-described method embodiments.
The embodiment of the present invention further provides a product printed by any of the above-mentioned wide color gamut printing process embodiments, or a product printed by any of the wide color gamut printing method embodiments, where the product has a target image printed thereon, and the product includes, but is not limited to, paper, leather, metal, glass, ceramic, plastic, wood, and other products.
It should be noted that the above-described embodiments of the apparatus are merely illustrative, and units illustrated as separate components may or may not be physically separate, and components illustrated as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A wide color gamut printing process, comprising:
a precoating printing step of printing a precoating layer on the surface of a recording medium;
a base printing step of printing a base image on the precoat layer;
and a compensation printing step:
determining a compensation image of the target image;
if the proportion of the compensation image is larger than a preset value, printing the compensation image in a horizontal or longitudinal layer-by-layer printing mode; if not, then,
determining a starting position;
acquiring a compensation position set on the compensation image;
determining a compensation path according to the starting position and the compensation position set, comprising: dividing a compensation position set according to a path direction of a starting position, wherein the path direction comprises a first direction, a second direction and a third direction, or comprises the first direction, the second direction, the third direction and a fourth direction, the first compensation position set is positioned on one side of the starting position in the first direction, the second compensation position set is positioned on one side of the starting position in the second direction, the third compensation position set is positioned on one side of the starting position in the third direction, and the fourth compensation position set is positioned on one side of the starting position in the fourth direction;
determining the compensation path to move to the first direction or the second direction or the third direction or the fourth direction according to the weights of the compensation position set, moving to the direction with small weight to obtain the compensation position with the shortest distance to the initial position, wherein a weight of the first set of compensated positions is associated with a distance of each compensated position in the first set of compensated positions from the starting position in the first direction, a weight of the second set of compensated positions is associated with a distance of each compensated position in the second set of compensated positions from the starting position in the second direction, a weight of the third set of compensated positions is associated with a distance of each compensated position in the third set of compensated positions from the starting position in the third direction, a weight of the fourth set of compensated positions is associated with a distance of each compensated position in the fourth set of compensated positions from the starting position in the fourth direction;
searching the next compensation position with the shortest distance with the new initial position by taking the compensation position with the shortest distance as the new initial position until the last compensation position in the compensation position set is searched, and determining the searched path as a compensation path;
printing a compensation image on the base image through the compensation path, the compensation image having a color gamut different from that of the base image.
2. The printing process of claim 1, wherein prior to said base printing step, said printing process further comprises:
and a white bottom printing step of printing a white bottom layer on the precoat layer.
3. The printing process according to claim 1 or 2, wherein after the offset printing step, the printing process further comprises:
and a gloss oil printing step of printing a gloss oil layer on the base image and the compensation image.
4. A printing process according to claim 3, wherein after the offset printing step and before the varnish printing step, the printing process further comprises:
a metallic color printing step of printing a metallic color image on the base image and/or the compensation image.
5. The printing process of claim 2, further comprising:
and a drying step, corresponding to the pre-coating printing step, the white bottom printing step, the basic printing step, the compensation printing step, the metal color printing step and the gloss oil printing step respectively, for curing the pre-coating layer and the gloss oil layer respectively and at least partially curing the white bottom layer, the basic image, the compensation image and the metal color image.
6. A wide color gamut printing method, comprising:
acquiring a target image;
determining a compensation image of the target image;
if the proportion of the compensation image is larger than a preset value, printing the compensation image in a horizontal or longitudinal layer-by-layer printing mode; if not, then,
determining a starting position;
acquiring a compensation position set on the compensation image;
determining a compensation path according to the starting position and the compensation position set, comprising: dividing a compensation position set according to a path direction of a starting position, wherein the path direction comprises a first direction, a second direction and a third direction, or comprises the first direction, the second direction, the third direction and a fourth direction, the first compensation position set is positioned on one side of the starting position in the first direction, the second compensation position set is positioned on one side of the starting position in the second direction, the third compensation position set is positioned on one side of the starting position in the third direction, and the fourth compensation position set is positioned on one side of the starting position in the fourth direction;
determining the compensation path to move to the first direction or the second direction or the third direction or the fourth direction according to the weights of the compensation position set, moving to the direction with small weight to obtain the compensation position with the shortest distance to the initial position, wherein a weight of the first set of compensated positions is associated with a distance of each compensated position in the first set of compensated positions from the starting position in the first direction, a weight of the second set of compensated positions is associated with a distance of each compensated position in the second set of compensated positions from the starting position in the second direction, a weight of the third set of compensated positions is associated with a distance of each compensated position in the third set of compensated positions from the starting position in the third direction, a weight of the fourth set of compensated positions is associated with a distance of each compensated position in the fourth set of compensated positions from the starting position in the fourth direction;
searching the next compensation position with the shortest distance with the new initial position by taking the compensation position with the shortest distance as the new initial position until the last compensation position in the compensation position set is searched, and determining the searched path as a compensation path;
printing the compensated image through the compensation path.
7. The printing method of claim 6, wherein prior to said printing said compensation image over said compensation path, said method comprises:
determining a base image of the target image, the base image having a different color gamut than a compensation image;
printing a base image from the base image.
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| CN112721486B (en) * | 2020-12-28 | 2022-09-02 | 深圳汉弘数字印刷集团股份有限公司 | Printing method and ink-jet printer |
| CN113103794A (en) * | 2021-03-16 | 2021-07-13 | 深圳汉华工业数码设备有限公司 | Printing method and device and digital printer |
| CN113085401B (en) * | 2021-04-06 | 2023-03-24 | 北京华科恒润智能科技有限公司 | Wall colored drawing printing method and device, electronic equipment and storage medium |
| CN114701166A (en) * | 2022-03-31 | 2022-07-05 | 苏州研拓自动化科技有限公司 | Control method for deformation of large-size high polymer material 3D printing material |
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Effective date of registration: 20220901 Address after: Room 101, No. 322, Yuanhu Road, Zhangbei Community, Longcheng Street, Longgang District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Hanhong Digital Printing Group Co.,Ltd. Address before: 518000 area B, 2nd floor, factory building a, No. 322 Yuanhu Road, Longcheng street, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN HANWAY INDUSTRIAL DIGITAL EQUIPMENT Co.,Ltd. |
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