80 results about "Screentone" patented technology

The invention relates to the technical field of image detection, and discloses a printing defect detection method and system based on computer vision. According to the method, a multi-mode imaging device collects a printing surface multi-channel fusion image, distortion is corrected through a dynamic segmentation module, a detection area mask is extracted, and a standard image is output. Inputting the standard image into a flaw detection model, extracting microscopic lattice points and macroscopic texture features, and matching with a template library to generate a probability distribution diagram; and performing multi-level judgment according to the image, quantitatively evaluating the flaws, and finally outputting flaw coordinates with space-time labels and type labels. The system comprises a multi-source acquisition module, a geometric correction module, a feature matching module, a grading decision-making module and a closed-loop control module, and real-time detection and feedback control of printing flaws are achieved. The method improves the detection precision and efficiency, is suitable for different types of printed matters, and has a wide application prospect.

The invention discloses a printing color closed-loop control system based on spectral analysis, and relates to the technical field of computer processing, and the system comprises the following steps: S01, collecting the spectral reflectivity data of a plurality of key color blocks on a printed matter measurement and control strip in real time through an online high-speed spectrometer at the frequency of not less than 100 color blocks per second; s02, constructing a color prediction model, wherein the model receives the spectral reflectivity data and outputs absorption scattering characteristics, the spectral transmittance of ink and dot expansion, trapping and overprinting effects in the printing process; s03, setting a dynamic tolerance threshold value delta Et based on a chromatic aberration formula according to the color precision requirement of the printed matter, and judging the absorption and scattering characteristics, the spectral transmittance of the ink and a grading tolerance interval in which the dot expansion, trapping and overprinting effects in the printing process are consistent with visual perception; and S04, converting the spectral reflectivity data acquired in real time into a CIELAB color space irrelevant to equipment, and comparing the spectral reflectivity data with a preset standard color target value. According to the method, the problems of different standards and color drift caused by artificial experience difference and visual fatigue are solved.

To provide a printer in which image quality is less likely to deteriorate even if halftone processing is performed using a dither mask repeatedly.SOLUTION: And a head unit that forms the output image on a medium based on a processing result of the halftone processing unit, in which a direction in which a plurality of heads discharge liquid is defined as a first direction, a direction in which the medium is transported is defined as a second direction, and a direction orthogonal to the first direction and the second direction is defined as a third direction. The output image includes a mixed region and an independent region, a length of the mixed region in the third direction is a first length, a length of the independent region in the third direction is a second length, and the number of elements of the dither mask in the third direction is N times or 1 / N times a total number of the number of pixels corresponding to the first length and the number of pixels corresponding to the second length.SELECTED DRAWING: Figure 1

The invention discloses an image-text defect detection method and system for color synthesis based on a plate roller image, and belongs to the technical field of printing quality detection. The method comprises the steps that a plate roller image comprising screen dots is obtained, an actual screen dot model is established, and the plate roller image is obtained by conducting three-dimensional scanning on a plate roller; converting a pre-acquired manuscript image into a theoretical dot model, and identifying dot defects based on the theoretical dot model and an actual dot model; predicting a printing effect image after color synthesis based on the plate roller image; color defects are identified based on the printing effect image and the document image. The method further comprises a step of calculating saturation based on the dot volume and performing color synthesis, and a step of sorting dot defects by comparing model differences, semantic segmentation and object-severity rules. The printing effect can be predicted before printing, dot defects and color defects can be detected, and the printing quality control efficiency is improved.

The present application discloses a method for spectral prediction and closed-loop feedback wide-width corrugated box extended gamut flexographic pre-printing, belonging to the field of packaging engineering and printing technology. The method comprises: establishing a dot gain mapping function based on the Yule-Nielsen correction model by testing the roughness, ink absorption and surface energy of the corrugated paper; printing a CMYKOGV seven-color characteristic color card to generate an adaptive ICC profile; using the CIEDE2000 color difference formula and constant hue angle mapping algorithm for gamut compression and color separation; selecting a low-hardness flat-top dot flexographic plate and configuring a anisotropic screen roller; introducing the Walker-Fetsko rheological ink transfer equation during printing, combining with real-time feedback of an online spectrophotometer to dynamically adjust the printing pressure and ink viscosity, and realizing closed-loop compensation. The present application realizes high-precision simulation of more than 90% of the PANTONE spot color library, completely gets rid of the dependence on spot colors, significantly improves the color stability and production efficiency of wide-width flexographic printing, and is suitable for extended gamut pre-printing production of high-quality corrugated boxes.

The invention discloses a color consistency control method in book batch printing and a method for printing books in a printing factory. The control method comprises the steps that printing parameters of a standard pattern corresponding to a to-be-printed book are sent to the designated printing factory; printing a standard pattern by a specified printing factory according to the printing parameters, and when the standard pattern is in a wet printing manuscript state, measuring field density values, wet chromatic values and actual dot area coverage rates of four colors CMYK; distributing the standard pattern, the printing parameters, the field density value of the wet printing draft, the wet chromatic value and the actual dot area coverage rate to a plurality of printing factories; a plurality of printing factories print the test pattern according to the printing parameters, the printing factories adjust working parameters and / or ink parameters of printing equipment according to the field density value, and whether the test pattern and the standard pattern meet the color consistency requirement or not is determined according to the wet chromatic value and the actual dot area coverage rate; and if the current test pattern conforms, the printing factory prints the to-be-printed book according to the working parameters and / or the ink parameters of the current printing equipment.

The invention relates to the technical field of mechanical point collision processing, in particular to a method for improving dust lines appearing at dot collision points, which comprises the following steps of: S1, preparing work and environment inspection: before starting processing, ensuring that a processing environment meets a basic dust-free requirement (such as a ten-thousand-level dust-free room), and stopping working; the cleaning state of key components such as a firing pin and a mold core is checked; s2, selecting a dustproof emulsion, and selecting a special dedusting emulsion with high adhesion, low volatility and no corrosion; and S3, dust removal emulsion is smeared, specifically, the emulsion is evenly extruded to the surface of the mold core, and the emulsion is spread out through dust-free paper or a special smearing tool. According to the scheme, a layer of dust removal emulsion is smeared on the lattice point mold core needing to be processed, so that in the processing process of a collision point, even if a collision needle accidentally adsorbs dust, the dust can be adsorbed away in the collision dotting process every time the collision point is subjected to collision processing, a plurality of lattice points with dust are prevented from continuously appearing, and the problem of dust lines is solved.

The application discloses a hot-pressing dot cluster arrangement processing technology for improving the efficiency of BLU picture improvement, S1: light guide plate design, CAD software is used to draw design drawings of the light guide plate, and G code programs are exported for use of numerical control machine tools; S2: material selection and pretreatment; S3: installation and calibration; S4: according to the design requirements of the light guide plate, appropriate hot-pressing molds are designed and selected, the hot-pressing molds are divided into several independent areas, each area has different heating elements and pressure adjusting devices; S5: segmented processing, the light guide plate is divided into multiple areas, each area corresponds to different dot arrangements, different processing parameters are set in the G code programs; S6: detection and analysis. The dot cluster arrangement of the light guide plate processed by the application greatly improves the gap between clusters, so that the dot density reaches 100%, and the gap between clusters is also guaranteed to be greater than 40% of the length of the cluster dot, and the requirement of the hot-pressing equipment for transfer printing can be met.

The invention discloses an information hiding anti-counterfeiting method based on a visual perception system and a printing method for a packaging box, and the information hiding anti-counterfeiting method comprises the steps: 1, inputting an original information image I, and carrying out the binarization processing, and obtaining a to-be-hidden information silhouette image B; 2, generating a salt and pepper noise image with the same size as the original information image I through image processing software or a computer programming language, and taking the salt and pepper noise image as an encrypted substrate binary dot image N; 3, copying an image N as a to-be-processed binary dot image N ', and performing pixel transformation on the image N' by taking the to-be-hidden information silhouette image B as a mask through image processing software or a computer programming language to obtain a transformed information hidden image H; and 4, superposing the encrypted substrate binary dot image N and the information hiding image H to obtain a target image C. The method is simple to operate, easy to implement and high in safety, and improves the anti-counterfeiting verification efficiency.

The invention discloses an invisible anti-counterfeiting method based on a printing dot structure, electronic equipment and a storage medium. The method comprises the following steps: acquiring a first image of an anti-counterfeiting mark of a to-be-verified product; performing identification processing on the first image, and confirming a first verification area and a second verification area of the anti-counterfeiting mark; obtaining a first grid structure of the first verification area and a second grid structure of the second verification area according to the first image; and determining an authenticity identification result of the to-be-verified product according to the first grid structure and the second grid structure. The printing steps of the anti-counterfeiting mark are as follows: acquiring a preset standard image; based on a preset partitioning strategy, determining a first printing area and a second printing area in the standard image; and controlling a spot color printing module in the invisible anti-counterfeit printing equipment to print based on the first printing area of the standard image, and controlling a color-colliding printing module in the invisible anti-counterfeit printing equipment to print based on the second printing area of the standard image to obtain the anti-counterfeit mark.

1. Name of the product in this design: Graphical User Interface for Outlet Inquiry in Electronic Equipment. 2. Intended use of this design: for use in an electronic device. 3. The key design feature of this product is its graphical user interface. 4. The image or photograph that best illustrates the design's key features: the front view. 5. Purpose of the graphical user interface: This graphical user interface is used for branch location inquiry. The main view is the service interface. When the user clicks the "Branch Map" button, they will be redirected to the branch map interface, as shown in Figure 1. The user enters text in the search bar at the top of the interface, and suggested information appears below the search bar, as shown in Figure 2. When the user clicks on any item in the suggested information, they will be redirected to the details page of that item, as shown in Figure 3. In this context, “×××” represents replaceable text and / or numbers and / or letters and / or symbols, and the map portion of the interface is not within the scope of protection of this design.

This utility model relates to the field of screen printing equipment technology, specifically to a prism sheet ink coating device, including a frame, a printing platform, and a screen. Two ink feeding boxes are symmetrically arranged on the top of the frame, and each ink feeding box is connected to an inclined conveying channel at its bottom. The printing platform is equipped with a lifting mechanism. A removable flat pressure plate is placed above the screen, the area of ​​which is equal to the effective working area of ​​the screen. A double-scraper mechanism is correspondingly arranged at the outlet end of the conveying channel. The ink formula is injected into the ink feeding box, and the ink flows through the conveying channel to the double-scraper mechanism. The flat pressure plate presses down vertically, causing the ink to be extruded through the gradient dots of the screen, thus pressing the ink onto the substrate and avoiding height differences. After using the flat pressure plate, it is removed. The double-scraper mechanism is then activated, and the screen is scraped twice by the double-scraper mechanism, eliminating the need for a return ink blade, thereby achieving an ink-free operation and preventing ink stagnation and solidification.

The purpose of the present invention is to provide: a flexographic printing plate which has excellent brushing resistance and is not susceptible to ink adhesion; and a method for producing the flexographic printing plate. This flexographic printing plate is a flexographic printing plate in which an image portion satisfies condition C. Condition C: when the shade of the image represented by the image section is formed by dots having a line number alpha, the region of the image section corresponding to the region in which the diameter of the dots is less than 17 [mu] m is X, and the region of the image section corresponding to the region in which the diameter of the dots is 17-45 [mu] m is Y; a region of the image section corresponding to a region in which the diameter of the lattice points exceeds 45 [mu] m is set as Z. X is formed to have rich / thin color by means of irregularly-arranged dots P having a diameter of 17-45 [mu] m (inclusive). Y is formed with a shade by means of irregularly arranged dots P having a diameter of 17 [mu] m or more and 45 [mu] m or with a shade by means of dots Q having a line number [alpha]. And Z is formed with rich and light through the lattice points Q with the line number of alpha. Wherein the diameter of the lattice point Pmin with the minimum diameter is less than or equal to the diameter of the lattice point Q.

1. Name of the product in this design: Insole (Dot). 2. Intended use of this design: shoe insole. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

1. The name of the design product: the main body of the transfer of money and recognition of the graphical user interface for electronic equipment. 2. The use of the design product: for an electronic device. 3. The design points of the design product: the interface content expressed by non-dotted lines in the graphical user interface. 4. The picture or photo that best indicates the design points: design 1 front view. 5. Design 1 is designated as the basic design. 6. The use of the graphical user interface: the whole and the claimed part of the graphical user interface of the design are used for the transfer of money and recognition. In design 1-2, the user can view the transfer information in the interface shown in the front view, and can click the "copy" option on the right side of a certain column information to copy the corresponding information. In design 3, the user can view the transfer information in the interface shown in the front view, and can click the "copy" option on the right side of a certain column information to copy the corresponding information, or can click the "copy all" option in the upper right corner of the interface to copy all the information. In design 4, the user can view the transfer information in the interface shown in the front view, and can click the "change" option in the middle of the upper part of the interface to switch the payer's name, and the interface when switching is shown in the change state diagram. In design 5, the user can view the transfer information in the interface shown in the front view, and can click the "more information" option behind the receiving bank to query the detailed information such as bank outlets, and the interface changes to the interface shown in the change state diagram. In design 6, the user can view the transfer information in the interface shown in the front view, and can click the "copy all" option in the upper right corner of the interface to copy all the information, and the interface changes to the interface shown in the change state diagram. 7. Other circumstances that need to be explained: "X" in the interface represents a text, number or symbol area. The part represented by dotted lines in each design is not claimed.

A toilet paper roll is provided that, despite being a long roll, exhibits a highly designed pattern and exhibits minimal wrinkling or twisting. This problem is solved by the following toilet paper roll: The roll is formed by rolling two layers of toilet paper into a roll having a roll diameter of 110 mm to 115 mm, wherein a pattern formed by halftone dot printing and solid printing is printed on one side, with the total area ratio of the pattern portion being 10% to 20%, the total area ratio of the halftone dot portion being 7.5% or more, and the total area ratio of the solid portion being 4.0% or less. The single-layer toilet paper has a paper thickness of 60 μm to 90 μm and is wound around a paper tube at a winding density of 0.83 to 2.05 and a roll length of 65 m to 90 m, with the surface printed with the pattern on the outer side.

The present application relates to the technical fields of printing dot test, especially relates to a printing dot adhesion test method and device, and a printing dot adhesion test device, which comprises a bottom plate, the upper end of the bottom plate is provided with two groups of corresponding X-axis sliding tables, Y-axis sliding tables are installed between the driving blocks of the X-axis sliding tables, Z-axis sliding tables are installed on the driving blocks of the Y-axis sliding tables, horizontal rods are fixedly installed on the driving blocks of the Z-axis sliding tables, the axis of the horizontal rods is parallel to the axis of the X-axis sliding tables, vertical rods are fixedly installed at the ends of the horizontal rods, test component mounting parts for connecting with test components are arranged at the lower ends of the vertical rods, the printing dot adhesion test method and device can realize semi-automatic grid division and adhesive tape pulling operation, can reduce the test error of printing dot adhesion caused by human factors such as force size, force angle, force speed, force uniformity and action time, and can improve test accuracy and uniformity.

To provide a printing quality inspecting technique that can determine whether a printing quality such as dot-gain concerning ink is good or not, with high efficiency and in detail.SOLUTION: An image of a region including a prescribed halftone-dot region constituted of dots of a single ink color and a back ground printed on a sheet is photographed. A straight line passing through at least one of the dots and included in the photographed image of the halftone-dot region is set. A color density level is measured along the straight line so as to obtain a color density profile along the straight line of the dot. It is determined whether a printing quality including a dot format concerning ink of an ink color of the dot is good or not, on the basis of the color density profile.SELECTED DRAWING: Figure 6

1. Name of the product of this design: Electronic device with a graphical user interface displaying information about bank branches. 2. Purpose of this design product: an electronic device. 3. The key design point of this design product lies in the graphical user interface content. 4. The picture or photo that best illustrates the key points of the design: main view. 5. Purpose of the graphical user interface: The graphical user interface of this design is used to provide users with surrounding information of bank branches and banking business data. 6. Human-computer interaction mode of the graphical user interface: The main view is the main page of this appearance design. The main view displays map information around the bank branch. Click a location on the map to enter the interface change state diagram 1. Click "View route" in the interface change state diagram 1 to enter the interface change state diagram 2. The interface change state diagram 2 displays a floating layer with the route. Click the "×" in the upper right corner of the floating layer, and click "Hot-selling products" to enter the interface change state diagram 3. The interface change state diagram 3 displays a floating layer with information about hot-selling products. Click the "×" in the upper right corner of the floating layer. Number, and click "X Line Information" to enter the interface change status diagram 4, click "Branch Portrait" in the upper right corner of the interface change status diagram 4 to enter the interface change status diagram 5, click "Corporate Promotion" in the upper right corner of the interface change status diagram 5 to enter the interface change status diagram 6, which shows the cooperation relationship diagram between bank branches and related corporate units. Click one of the corporate units to enter the interface change status diagram 7, which shows promotional pictures or videos and other content. Click the zoom button in the lower right corner of the promotional content to enter the interface change status diagram 8.

The invention provides a super-resolution reconstruction method based on extraction of low-frequency characteristics of an ink-jet printing image, and the method comprises the steps: S1, building a data set, collecting images of different amplification factors, different printing dot area rates and different ink dot positions on different pieces of paper, building a data sample set, and dividing the data sample set into a training set and a test set; s2, constructing a model architecture, and using a deep residual convolutional network formed by using dense connection and jump connection modes on a generative network part of an original SRGAN network model; and S3, adjusting parameters of the model in continuous generation-confrontation of image feature information by adopting a construction mode of the model architecture and utilizing the characteristics of a generative confrontation network of the SRGAN network model to obtain a reconstruction effect of a reconstructed image. According to the method, different parts of the input data are dynamically paid attention to by adding the convolution block attention module CBAM, the understanding and generation capability of the model is improved, and the resolution of the image is improved.

The present invention relates to a method for producing halftone contract proofs using plotter-printed proofs with a combination of hybrid and non-hybrid screens for subsequent flexographic printing. This allows AM, FM, and XM screens to be combined in the proof without distortion, and allows the parameters defining plotter printing to be automatically incorporated into different machines capable of performing such printing. The method consists of 15 steps, in which specific hybrid screens are generated for halftone plotter proofs using correction curves and minimum values ​​different from those used for flexographic cliché printing, and the information required for automating the process is incorporated in files and databases in a standardized manner by modifying the dot gain settings on the color profile.

The application discloses a kind of super capacity invisible two-dimensional code technology based on true color multicolor halftone dot array.The technology takes two-dimensional code information capacity and its anti-fake application as target, based on printed true color CMYK corresponding quaternary encoding rule, through self-defined color coding technology, original information is modulated to generate multicolor halftone dot array two-dimensional code.The code takes single printing dot as encoding unit, collects its microscopic image to obtain the dot array distribution data of single dot, and decoding can be realized.Compared with prior art, the super capacity invisible two-dimensional code of the application has large encoding density, high identification reliability, and has the functional advantages of super capacity, invisible anti-fake, and has very high actual market value in e-commerce, printing and packaging, product traceability and other fields.

The invention provides an anti-counterfeiting image processing method, an anti-counterfeiting image recognition method and an anti-counterfeiting image recognition device, and relates to the technical field of anti-counterfeiting. The problem that an anti-fake image generated by an existing anti-fake technology is prone to being copied by ultrahigh-precision scanning and professional printing equipment, and consequently authenticity of the existing anti-fake image cannot be recognized is solved. The anti-counterfeiting image processing method comprises the following steps: acquiring parameters and image-text content information of a target anti-counterfeiting image; based on the parameters of the target anti-counterfeiting image, generating a net hanging image matrix; carrying out fusion processing on the network hanging image matrix and the image-text content information to obtain a binary dot map; generating a target anti-counterfeiting image according to the binarized dot map; and performing anti-counterfeiting identification on the to-be-identified anti-counterfeiting image based on the network hanging image matrix in the target anti-counterfeiting image. According to the scheme of the invention, the anti-counterfeiting precision and protection capability of the anti-counterfeiting image are improved, accurate anti-counterfeiting identification of the existing anti-counterfeiting image is realized, and high-precision illegal copying of the existing anti-counterfeiting image is prevented.

The present invention discloses a calibration method for electronic engraving gravure plate making. By inputting different current values at set intervals without calibration, a printed four-color step wedge is obtained. Then, the density values and the solid density value on the four-color step wedge are measured to obtain the relationship between the density values of the four-color step wedge and the corresponding engraving current values. The density values are respectively converted into tone values a, and the relationship between the density value D<subgt;t< / subgt; and the current value is converted into the relationship between the tone value a and the engraving current value. A tone value increase curve is set, and the tone value increase curve is converted into a printing reproduction curve. According to the relationship between the tone value a and the engraving current value, the target tone value is obtained through the printing reproduction curve, so as to obtain the engraving current value A, and finally linearization calibration is carried out. The calibration method of the present invention solves the quality problems such as dot gain and low printing density in the existing electronic engraving plate making method.

The invention discloses a plastic bottle surface color screen printing process which comprises the following steps: A, carrying out color separation on a printing draft, and disassembling the printing draft into four single-color pictures of yellow, red, blue and black; b, controlling and setting the dot line number of each single-color picture between 96-120 lines; c, making each single-color picture into a screen printing plate by using a photosensitive film silk screen plate; and D, four kinds of color transparent UV curing printing ink with the colors of pinkish yellow, pinkish red, pinkish blue and black are taken, the surface of the plastic bottle body is printed according to the sequence of pinkish yellow, pinkish red, pinkish blue and black, all single-color printing processes synchronously follow ultraviolet irradiation, and the printed patterns are rapidly condensed and cured. By adopting the process for printing, multiple times of printing can be carried out at the same beat, so that the color printing effect is achieved.

This invention provides a halftone processing method for inkjet printing based on cross-gradient halftone screens, comprising: S1, color space conversion; S2, dot basic unit design; S3, halftone screen generation and filling; S4, error diffusion processing; and S5, image compositing. The advantages of this method in terms of fundamental technology are: accurate color space conversion; stable error diffusion control; and a reliable channel processing mechanism. The advantages of this method in terms of innovation are: cross-line halftone dots provide better directionality; gradient transitions reduce graininess; and overlapping filling ensures smoothness.

The invention relates to a defective spray hole self-adaptive compensation method, computer equipment and a storage medium. Visual defects caused by defective spray holes are dynamically repaired, distribution and size of peripheral ink droplets are adjusted under the condition that the jitter direction of printing points generated after halftone processing is followed as much as possible, and blank / wrong ink dots are prevented from affecting image quality. The method comprises the following steps: dynamically calculating the position and compensation amount of a compensation printing point from three dimensions of point, line and surface based on the printing direction of a defect spraying hole point in a graph after the original halftone processing and the continuity and concentration change of the defect spraying hole point in the vertical direction and the horizontal direction according to the randomness and isotropy of dot distribution after the original halftone processing; the phenomenon that the uniformity and smoothness of the image are affected by fixed position and random position compensation in a traditional method is avoided, and'white lines' appearing in a high-concentration area or'black lines' appearing in a low-concentration area and structural defects under local out-of-control concentration in the traditional method are avoided.

This application relates to a breathable printed fabric and its production process. The production process includes color separation of the pattern to be printed and film preparation; fabrication of a screen and selection of a squeegee; preparation of a film screen; preparation of digital white plastisol; addition of the digital white plastisol to the film screen; and printing the digital white plastisol onto the fabric using a squeegee. During the color separation process, a corresponding grayscale value is selected based on the color distribution of the pattern to be printed to adjust the film. The grayscale value ranges from 20% to 80%. The grayscale value provides a basis for the depth of color in the pattern to be printed, using the solidity and blurriness of the halftone dots to represent the depth of color. Based on the pattern to be printed, a grayscale value corresponding to the color distribution of the pattern is selected within the 20%-80% grayscale range, allowing the film to present an effect that matches the pattern. Combined with digital white plastisol printing, the resulting fabric not only effectively displays the color distribution of the pattern but also achieves a breathable, non-film-forming effect.

This disclosure relates to the field of industrial automation technology, and provides a method and apparatus for calculating the screen printing path of a convex irregular bottle. The method includes: decomposing the convex contour point set of the bottle to be printed into several continuous straight line segments and / or curve segments according to a preset straightness tolerance parameter, generating a segment information set; for the curve segment, according to the target rotation angle, rotating the contour points in the current curve segment in the opposite direction of the origin by the target rotation angle, searching for the point with the largest ordinate value in the rotation point set as a tangent candidate point, performing secondary interpolation within the interval formed by the tangent candidate point and its adjacent points to obtain the brush point coordinates, and calculating the halftone dot coordinates according to the segment starting length of the current curve segment and the cumulative length of the brush point within the segment of the current curve segment; generating printing path data containing brush point trajectory and halftone dot trajectory, wherein the brush point trajectory is composed of brush point coordinates and the halftone dot trajectory is composed of halftone dot coordinates.