CN112233192A - Electronic signature method and system for printed matter - Google Patents
Electronic signature method and system for printed matter Download PDFInfo
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- CN112233192A CN112233192A CN202011021971.6A CN202011021971A CN112233192A CN 112233192 A CN112233192 A CN 112233192A CN 202011021971 A CN202011021971 A CN 202011021971A CN 112233192 A CN112233192 A CN 112233192A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1203—Improving or facilitating administration, e.g. print management
- G06F3/1208—Improving or facilitating administration, e.g. print management resulting in improved quality of the output result, e.g. print layout, colours, workflows, print preview
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Abstract
The application provides a method and a device for electronic signature of a printed matter, wherein the method comprises the following steps: adjusting the printing machine until a proofing sample sheet meeting the internal requirement is printed; shooting the sample sheet by adopting image acquisition equipment in a standard light environment to form an electronic sample image; the image acquisition equipment is used for correcting and characterizing in a standard light environment; and sending the electronic sample image to a remote client so that the remote client performs electronic sample according to the electronic sample image. Because the electronic signature image is the printed sample sheet collected by the image collecting device and printed by the printing machine for final production, the electronic signature image truly reproduces the characteristics of the printed sample sheet printed by the printing machine. Because the display configured by the remote client can realize proofing, the client can realize the proofing of the printing machine in the office without visiting the printing enterprise, and then determines whether to carry out electronic proofing.
Description
Technical Field
The application relates to the technical field of printing, in particular to an electronic sample signing method and system for a printed matter.
Background
The signature is a prepress confirmation process that a printing enterprise provides a format and a color draft and a client determines whether the format and the color draft meet requirements. In order to avoid a dispute after the affairs, printing enterprises generally start printing a large batch of printed matters after users sign samples.
At present, the methods for printing the samples include the following methods:
(1) carrying out color management inside a printing enterprise; printing a digital sample by adopting a digital sample printing mode based on the production characteristics of a printing machine, and determining whether the digital sample and the blue sample meet the requirements or not by a client; if the digital sample meets the requirements, the user signs the digital sample and finalizes the draft; the printer captain takes the digital sample as a target, and adjusts the printer to carry out printing production, so that the color of the formal printing sample is as consistent as possible with the digital sample.
(2) The printing enterprise performs color management internally and provides a color profile (e.g., an ICC profile) for the printer to a remote client; correcting and characterizing a display of the remote client, and installing a color feature file of the printer; after the printing enterprise provides the electronic version file for printing to the remote client, the remote client displays the electronic version file on the display through color conversion, and the user determines whether to print the signature based on the display color. And then, the printing enterprise provides a digital printing sample for the printer captain through internal color management, and the printer captain adjusts the printer to perform printing production by taking the digital sample as a target so that the color of the printing sample is consistent with the digital sample as far as possible.
(3) Printing enterprises directly use a printing machine to produce printing sample sheets as sample sheets for signing according to a formal printing production mode; after the printing sample is determined to meet the requirements, the customer directly signs on the printing sample; and then, the captain of the printing machine adjusts the printing machine to perform printing production by taking the sample printing of the samples as a target.
Due to the complexity of printing production (e.g., the ink distribution of the printing press, the structural characteristics of the ink distribution mechanism, and the randomness of the distribution of image areas in the printing plate), the foregoing (1) and (2) do not guarantee the consistency of the digital printing sample and the soft proofing and final printing color based on the electronic version printing document; and (3) the customer is required to look at the sample in the printing enterprise, or the printing enterprise is required to print on the machine for multiple times aiming at the same set of printing plate, and then the printed sample is mailed to the customer, so that the cost is too high.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the application provides a printed matter electronic signature method and device.
In one aspect, the present application provides an electronic signature method for a printed matter, including:
adjusting the printing machine until a proofing sample sheet meeting the internal requirement is printed;
shooting the sample sheet by adopting image acquisition equipment in a standard light environment to form an electronic sample image; the image acquisition equipment is used for correcting and characterizing under a standard light environment;
and sending the electronic sample image to a remote client so that the remote client performs electronic sample according to the electronic sample image.
Optionally, the electronic signature method for the printed matter further includes:
shooting a reference printing sheet by adopting the image acquisition equipment in a standard light environment to form a sample-drawing reference image;
sending the signature reference image to the remote client; and/or the presence of a gas in the gas,
under the condition that the printing contents of the reference printed sheet and the proofing sample sheet are the same, comparing the colorimetric values of pixels corresponding to the electronic signature image and the signature reference image to form color difference information; and the number of the first and second groups,
and sending the color difference information to the remote client.
Optionally, the electronic signature method for the printed matter further includes:
identifying printing defects in the proofing sample sheet;
sending the electronic signature image to a remote client, comprising: and under the condition that the proofing sample sheet is determined to have no printing defects, the electronic signature image is sent to the remote client.
Optionally, the proofing sample sheet is a printing sheet spliced into a large version according to a splicing rule;
adopt image acquisition equipment to shoot under standard environment the proof sample sheet forms the electron image of signing a sample, includes:
collecting the proofing sample sheet by adopting image collection equipment in a standard environment to form a large-version proofing image;
and processing the large-version signature images according to the large-version splicing rule to form a plurality of electronic signature images which are sequenced according to the pages of the printed finished products.
Optionally, the qualified proofing proofs include:
the color control strip comprises a sampling sheet with color density or chroma meeting the standard requirement, and/or a sampling sheet with color density or chroma slightly lower than the standard requirement, and/or a sampling sheet with color density or chroma slightly higher than the standard requirement.
Optionally, the image capturing device is a photographing type capturing device or a scanning type capturing device.
In another aspect, the present application further provides an electronic signature system for printed matters, including:
the image acquisition equipment is used for acquiring the proofing sample sheet under the standard light environment to form an electronic sample image; the image acquisition equipment is used for correcting and characterizing standard ambient light;
and the image sending equipment is used for sending the electronic signature image to a remote client.
Optionally, the image collecting device is further configured to collect the reference printed sheet in a standard light environment to obtain a signature reference image; (ii) a The reference printed sheet and the proofing sample sheet have the same printing content; the electronic signature system for the printed matter further comprises:
the processor is used for comparing the chromatic values of corresponding pixels in the electronic sample image and the sample reference image to form color difference information;
the image sending device is further configured to send the color difference information to the remote client, so that the remote client outputs the color difference information.
Optionally, the electronic signature system for printed matters further comprises:
a processor for identifying printing defects in the proofing proofs;
and the image sending equipment sends the electronic sample signing image to the remote client under the condition that the sampling sample sheet is determined to have no detection defects.
Optionally, the proofing sample sheet is a printing sheet spliced into a large version according to a splicing rule;
the image acquisition equipment is used for acquiring the proofing sample image in a standard environment to form a large-version sign image;
the processor is used for processing the large-format signature image according to the large-format splicing rule to form a plurality of electronic signature images which are sequenced according to a printed finished product page.
Compared with the prior art, the technical scheme provided by the application has the following advantages:
because the electronic signature image is the printed sample sheet collected by the image collecting device and printed by the printing machine for final production, the electronic signature image truly reproduces the characteristics of the printed sample sheet printed by the printing machine. Because the electronic sample-drawing image is sent to the remote client, the remote client can adopt the display to carry out soft sample-drawing, and the client can realize the sample-drawing of the printing machine in the own office without visiting the printing enterprise; that is to say, the electronic proofing method for the printed matter provided by the application simultaneously solves the problems of various proofing modes mentioned in the background technology.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flowchart of an electronic signature method for printed matters provided by an embodiment of the present application;
FIG. 2 is a schematic structural diagram of an electronic signature system for printed matters according to an embodiment of the present application;
the system comprises an image acquisition device 11, an image sending device 12 and a processor 13.
Detailed Description
In order that the above-mentioned objects, features and advantages of the present application may be more clearly understood, the solution of the present application will be further described below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein; it is to be understood that the embodiments described in this specification are only some embodiments of the present application and not all embodiments.
The embodiment of the application provides an electronic sample signing method for a printed matter, so that a remote client display displays the color effect of a printed sample sheet in a soft proofing mode, a client can see the color effect of the printed sample sheet printed by a printing machine remotely, and a user can judge whether to sign or not and start production based on the soft proofing displayed by the display.
It should be noted that the basic premise that the embodiments of the present application can be implemented is as follows: the color gamut used by the remote client for the soft proofing display is larger than the printing color gamut of the printer (the printer conditions include the printer itself, ink characteristics, paper characteristics, etc.), and the color gamut of the image acquisition device is also larger than the printing color gamut of the printer, so that the problems of color gamut compression and color distortion after color information transmission and conversion can not occur because the target color gamut is smaller than the source color gamut.
Fig. 1 is a flowchart of an electronic signature method for a printed matter according to an embodiment of the present disclosure. As shown in fig. 1, the electronic signature method for printed matters provided by the embodiment of the application comprises steps S101 to S103.
S101: and adjusting the printing machine until the printed sample sheet meets the internal requirement.
The printing press used in the specific application of the embodiment of the present application may be various types of printing presses, and may be, for example, an offset printing press, a flexographic printing press, an intaglio printing press, and a digital printing press.
In practical application, because of the limitation of printing principle, only an offset printer and a digital printer are mostly used for printing gradient patterns with rich color gradation, and a flexographic printer and an intaglio printer are mostly used for large-color-block spot color printing (the color core of a spot color block is determined by spot color ink and has corresponding reference), so the printers adopted in practical application of the embodiment of the application are mostly the offset printers or the digital printers.
In the specific application of the embodiment of the application, the sampling proof sheet is a color printing proof sheet, and the sampling proof sheet can adopt a traditional amplitude modulation screening mode or a frequency modulation screening mode; the sample printing can be carried out by CMYK four-color printing, also can be carried out by GMYK + RGB super four-color high fidelity printing, and also can be carried out by color printing and UV gloss oil; under the condition that the printing machine is an offset printing machine, the printing mode can adopt water offset printing or waterless printing, as long as the proofing sample sheet meets specific requirements, and the corresponding printing color gamut is smaller than the collection color gamut of the image collection device and the display color gamut of the display for soft proofing.
Taking traditional offset printing as an example, the adjusting printer comprises: (2) adjusting the positions of printing plates of printing units of various colors to realize color registration; (2) adjusting the pressure between the impression cylinder and the plate cylinder to ensure the reasonableness of the dot enlargement; (3) the using amount of the fountain solution and the amount of the ink are adjusted, so that the balance of the ink and the water is realized, the color of a printed product is clear, and the contrast is high; (4) the oscillating quantity of the oscillating rollers and the oscillating water rollers of each printing unit is adjusted to ensure the color consistency of adjacent ink areas.
In the specific application of the embodiment of the application, the proofing sample sheets meeting the internal requirements are sample sheets meeting the internal requirements of printing enterprises. In different cases, the standards of proof sheets that meet the internal requirements of printing enterprises are different, as follows.
(1) Under the condition that the quality and the ink color effect of the proofing sample sheet are controlled by a printer captain or corresponding quality inspection personnel, the proofing sample sheet meeting the internal requirement can be determined by the printer captain or the quality inspection personnel through visual observation; for example, the proofed sheet can be determined by the captain viewing the overprint pattern, the print dot shape, the solid density of the single color, and the density of the 75% dot area through a magnifying glass, and the overall impression effect.
(2) Under the condition that the printing machine table is provided with detection equipment and the printing test control strips are arranged on the sample printing sheets, the detection equipment can be adopted to scan the printing test control strips, and whether the sample printing sheets meet the internal requirements of enterprises or not is determined according to the output result of the detection equipment and the printing effect of the whole sample printing sheets. In the concrete application, three sampling samples can be obtained, and the three sampling samples are respectively: the color control strip color density or chroma meets the standard requirement of the sample sheet, the color control strip color density or chroma is slightly lower than the standard requirement of the sample sheet, the color control strip color density or chroma is slightly higher than the standard requirement of the sample sheet, correspondingly, the images in the three sample sheets are the sample sheet with the ink color meeting the standard, the sample sheet with the ink color being slightly different, and the sample sheet with the ink color being slightly lighter.
It should be noted that the proofed sheet should be one that is free of printing defects, such as paper lint, dirty, pasted, dropped, dull in color. In the specific operation, whether the sample printed sheet is defective or not can be determined by the following method: (1) the method is determined by a printer owner or a person between printers through visual observation of sample sheets; (2) the method comprises the steps of collecting a sample sheet by adopting an image collecting device to form a digital image, and comparing the digital image with a prepress electronic file (such as a PDF file or a printing plate dot file after color separation) to determine whether the printing defects occur or not.
After the printing machine is adjusted and the color of the sample printing sheet is guaranteed to be stable by uniformly printing ink colors on a plurality of pieces of paper, the last sample printing sheets with consistent colors can be used as the sample printing sheet.
S102: and shooting a proofing sample sheet by adopting image acquisition equipment in a standard light environment to form an electronic sample image.
In the embodiment of the present application, the standard light environment is a standard environment for observing printed matters, and the conditions thereof include: (1) the light source used was a standard light source: (2) the standard light source is relative to the angle of the sample placing table (such as a printing machine table), and the angle for observing the sample placing table meets the standard requirement. In a specific application, the standard light source can be a D65 light source and a D50 light source in the printing industry, and the angles of the light source and the image acquisition equipment can be conventional angles in the printing industry.
In an embodiment of the application, the image acquisition device is a color image acquisition device comprising at least three color acquisition channels (RGB channels). In specific application, the image acquisition equipment can be three-channel image acquisition equipment which has higher color reproduction precision and similar spectral characteristics of each channel and human eye cone cell spectral characteristics; in other applications, the image capture device may be a multi-spectral image capture device that uses a hyper-tristimulus channel to represent the color of the printed matter.
In specific application, the image acquisition equipment can be line scanning acquisition equipment or surface scanning equipment; for example, in some applications, the image capture device is an area array CCD. In addition, the device resolution of the image capture device should match or be greater than the resolution of the proofing sheets so that the formed electronic signature image can display the dot details of the proofing sheets.
The image acquisition equipment is corrected and characterized in a standard light environment so as to ensure that the acquired image can represent the color characteristics in the standard light environment. Specifically, the correction and characterization process of the image capturing device may include: (1) calibrating the image acquisition equipment by adopting a standard white board and a standard black field, determining the black and white field of the image acquisition equipment, and performing linearization; (2) in a standard light environment, an image acquisition device is adopted to shoot color blocks with various known color characteristics (such as chromaticity), corresponding spectrum or gray scale data is obtained, and a lookup table of the color characteristics and the spectrum or gray scale data is established to realize the characterization of the device.
In the specific application of the embodiment of the application, an ICC color profile of the image acquisition device may be constructed by using the lookup table of the color characteristics and the spectrum or gray scale data, so as to implement conversion of chromaticity in an electronic sample image acquired by the image acquisition device according to the ICC color profile, and implement conversion of color from a certain color space to another color space by matching with ICC profiles of subsequent color devices of other types. In other applications of the embodiment of the present application, the color conversion relationship between the source device and the target device may also be directly established by directly using the aforementioned lookup table and other lookup tables.
In a specific application of the embodiment of the present application, the format of the electronic signature image may be TIFF, JPEG, BTP, or other formats, or may also adopt a special format file, and the embodiment of the present application is not particularly limited. In addition, what kind of chromaticity space mode is specifically adopted for storing the electronic sample image, which is not particularly limited in this embodiment; in specific application, if the image acquisition equipment is RGB three-channel equipment, the electronic signature image can be an RGB image or a Lab colorimetric image after color conversion; in the case that the image acquisition device is a multispectral device, the electronic signature image may be a multispectral image, or may be a Lab colorimetric image obtained by performing color conversion by using multispectral.
S103: and sending the electronic signature image to a remote client.
The remote client is a client which is not in the same position with the image acquisition equipment and needs communication interconnection. In a specific application, the remote client may be a client located at a client, or may be a client located inside a printing enterprise (such as a pre-press department).
After the electronic sample image is sent to the remote client, the remote client reads the electronic sample image and outputs the image corresponding to the electronic sample image on the configured display in a soft proofing mode.
It should be noted that the display is also a display that has been corrected and characterized to ensure that the display is capable of achieving a relatively accurate reproduction of colors. In specific application, after the display is linearized, a color block of a specific gray combination is displayed by the display, and color block information is collected by a colorimeter to realize the characterization of the display. The display characterization file may be stored in the form of an ICC color profile, or a color conversion relationship with corresponding color patches in the printer may be directly established.
It should also be noted that the display should be one that has good color uniformity and is capable of maintaining consistent long-term display characteristics. The type of the display is not particularly limited in the embodiment of the present application, and may be a CRT, LCD, LED, or other type of display; in specific application, the display is preferably professional-grade display such as an art android display widely used in the color industry.
As previously described, because the display is characterized and the display gamut of the display is greater than the print gamut, the use of the display enables accurate reproduction of the colors represented in the electronic signature image; because the electronic sample image is the sample sheet which is collected by the image collecting equipment and printed by the printing machine for final production, the electronic sample image truly reproduces the characteristics of the printing sample sheet printed by the printing machine; accordingly, the display is also able to accurately reproduce the final print color.
In addition, because the display configured by the remote client can realize proofing, the client can realize the proofing of the proofing sheet of the printing machine in the office without visiting a printing enterprise, and determine whether the proofing sheet can be used as a color standard proofing sheet for formal printing according to the proofing feeling, and then determine whether to perform electronic proofing.
In the specific application, after a user determines that a proofing sample sheet can be used as a printing sample sheet for signature, the user can sign an electronic signature image by adopting own signature and return the signed electronic signature image to a printing enterprise; after receiving the client's signature, the printing enterprise may perform formal printing based on the proof sheet.
In a specific application of the present application, a printing enterprise may already print a similar color on-reference sample sheet before printing a current printed product (e.g., a journal printing enterprise prints other printed sheets of a corresponding journal, and a packaging printing enterprise prints a same type of package of a previous batch), and a client may require that the color of the currently printed product and the color of the reference sample sheet are as consistent as possible.
In order to solve the foregoing problem, the method for electronically signing a printed matter provided in the embodiment of the present application may further include steps S104 and S105 in addition to the foregoing steps S101 to S103.
S104: and shooting the reference sample sheet by adopting image acquisition equipment in a standard light environment to form a sample-drawing reference image.
The execution conditions and the execution procedure in step S104 are as in step S102 described above, and only the imaging target is replaced by the reference proof from the proof, so the execution of step S104 will not be described here, and the description of step S102 may be referred to for corresponding contents.
In addition, step S104 may be executed before any step of S101 to S103 is executed, and the embodiment of the present application is not limited.
S105: and sending the sample reference image to a remote client.
The execution conditions and execution process in step S105 are as in step S103, and will not be repeated here. After the remote client receives the reference sample image, the sample reference image can be output by adopting a display in a soft proofing mode; the client can determine whether the color of the electronic sample image is proper or not by comparing and observing the display effects of the electronic sample image and the sample reference image and taking the sample reference image as a reference, and then determine whether the sample is available or not.
On the basis of step S104, the embodiment of the present application may further include steps S106 and S107. It should be noted that steps S106 and S107 are performed on the premise that the print contents of both are the same.
S106: and comparing the chromatic values of the pixels corresponding to the electronic signature image and the signature reference image to form color difference information.
In step S106, in this embodiment of the application, the electronic signature image and the signature reference image are both images stored in the form of device-related color spaces, and for this purpose, pixel information in the electronic tag image and the color reference image needs to be converted into chrominance values in a chrominance space through color conversion.
Comparing the corresponding chromatic values in the electronic signature image and the signature reference image, firstly intercepting or rotating the electronic signature image and the signature reference image, determining a printing part in the electronic signature image and the signature reference image, and aligning the printing part; and then subtracting the chromatic values of corresponding pixels in the electronic sample image and the sample reference image to form color difference information.
S107: and sending the color difference information to a remote client.
In a specific application of this embodiment, the color difference information may be sent to the remote client as an individual file, or may be sent to the remote client along with the electronic signature image as a mask of the electronic signature image.
After receiving the color difference information, the remote client can check the corresponding pixel color difference information. In specific application, when a customer clicks a certain pixel in the electronic signature image, the color difference information of the corresponding pixel can be immediately searched and displayed.
By adopting the foregoing steps S106 and S107, the user can intuitively determine the change in the color of the printed matter of the present printing and the previous printing, and determine whether to accept the change, and then determine whether to perform the electronic proof.
In other applications of the embodiment of the present application, the aforementioned step S106 may also be executed by a remote client, and is no longer executed by a server of a printing enterprise.
In the specific application of the embodiment of the application, the printing machines adopted by printing enterprises are mostly split printing machines, full-open printing machines and other large-size printing machines, the small-size printing documents are split and processed into large versions according to the split rules in the plate making before printing, and printing is carried out after the printing plates are manufactured (in practical application, single-sided printing or double-sided printing is possible). After printing is finished, the printing sample sheets also need to be folded or cut according to the imposition rules.
Taking journal printing as an example, a printing sample is formed by splicing a plurality of single pages into a large plate; after the printed sample sheet is folded, single pages positioned at different positions of the printing plate are adjacent. And the customer may require that the colors of adjacent single pages be consistent.
Step S102 may be subdivided into steps S1021 and S1022 according to the aforementioned requirements.
S1021: and collecting the proofing sample image by adopting image collecting equipment in a standard light environment to form a large-version proofing image.
The large-version sign-out image is a full-width image of the proofing sample sheet.
In the specific application of the embodiment of the application, the image acquisition equipment can directly acquire the full-page image of the proof sample at one time, and can also acquire partial areas at one time. After the image is collected by the collecting device, a large-version label-like image is formed.
S1022: and processing the large-version signature images according to the large-version splicing rule to form a plurality of electronic signature images which are sequenced according to the pages of the printed finished products.
In step S1022, the processing of the large-format signature image according to the large-format mosaicing rule includes: (1) formulating a folding rule according to the large edition splicing rule, splitting the large edition signature image to form a single-page electronic signature image; (2) and sequencing the electronic sample images of the single page according to a page sequence rule corresponding to the large page splicing rule to form a plurality of electronic sample images sequenced according to the printed finished product.
Still taking journal printing as an example, in step S1022, the remaining single page portion may be finally cut after printing according to the rule of splitting large version, and the large version signature image is cut to obtain the single page portion; and then, forming the electronic signature images which are sorted according to the pages in the printed finished product according to the sorting rule of each single page.
After the electronic signature image formed in step S1022 is sent to the remote client, the remote client may directly display the electronic signature image according to a single page sorting order, for example, simultaneously display a page crossing image; thus, the customer can directly check whether the printing color of the spread page meets the requirement.
In practical applications, step S107 may be further executed at the printing enterprise side to avoid sending the electronic signature image with the printing defect to the client.
S107: and processing the electronic sample image and judging whether the sample printing sheet has printing defects or not.
The printing defects may be paper lint, dirty, stuck, plate-slip, etc. defects as mentioned above. And judging whether the proofing sample sheet is stored in the printing defect or not can be determined by comparing the electronic sample image with the large-version digital file after the large-version is spliced.
If the proof sample sheet is judged to have printing defects, prompting the captain of the printing machine to obtain the proof sample sheet again, and executing the step S102; if it is determined that the proof print does not have a print defect, step S103 may be performed.
In addition to the electronic signature system for printed matters, an embodiment of the application also provides an electronic signature system for printed matters. The printed matter electronic sample signing system and the printed matter electronic sample signing method adopt the same inventive concept.
Fig. 2 is a schematic structural diagram of an electronic signature system for printed matters according to an embodiment of the present application. The sample system provided by the embodiment of the present application as shown in fig. 2 includes an image capturing device 11 and an image sending device 12 provided in a printing enterprise.
The image acquisition equipment 11 is used for acquiring the sample sheets under the standard light environment to form electronic sample images.
The sample printing sheet is printed by the printing machine and meets the internal requirements of printing enterprises. In different cases, the standards of proof sheets that meet the internal requirements of printing enterprises are different, as follows.
(1) Under the condition that the quality and the ink color effect of the proofing sample sheet are controlled by a printer captain or corresponding quality inspection personnel, the proofing sample sheet meeting the internal requirement can be determined by the printer captain or the quality inspection personnel through visual observation; for example, the proofed sheet can be determined by the captain viewing the overprint pattern, the print dot shape, the solid density of the single color, and the density of the 75% dot area through a magnifying glass, and the overall impression effect.
(2) Under the condition that the printing machine table is provided with detection equipment and the printing test control strips are arranged on the sample printing sheets, the detection equipment can be adopted to scan the printing test control strips, and whether the sample printing sheets meet the internal requirements of enterprises or not is determined according to the output result of the detection equipment and the printing effect of the whole sample printing sheets. In the concrete application, three sampling samples can be obtained, and the three sampling samples are respectively: the color control strip color density or chroma meets the standard requirement of the sample sheet, the color control strip color density or chroma is slightly lower than the standard requirement of the sample sheet, the color control strip color density or chroma is slightly higher than the standard requirement of the sample sheet, correspondingly, the images in the three sample sheets are the sample sheet with the ink color meeting the standard, the sample sheet with the ink color being slightly different, and the sample sheet with the ink color being slightly lighter.
In the embodiment of the present application, the standard light environment is a standard environment for observing printed matters, and the conditions thereof include: (1) the light source used was a standard light source: (2) the standard light source is relative to the angle of the sample placing table (such as a printing machine table), and the angle for observing the sample placing table meets the standard requirement. In a specific application, the standard light source may be a D65 light source or a D50 light source in the printing industry, and the angle between the light source and the image capturing device 11 may be a conventional angle in the printing industry.
In the embodiment of the present application, the image capture device 11 is a color image capture device 11 that includes at least three color capture channels (RGB channels). In a specific application, the image acquisition device 11 may be a three-channel image acquisition device 11 having high color reproduction accuracy and similar spectral characteristics of each channel and human eye cone cells; in other applications, the image capture device may also be a multi-spectral image capture device 11, employing hyper-tristimulus channels to represent the color of the printed matter.
In a specific application, the image capturing device 11 may be a line scanning capturing device or an area scanning device; for example, in some applications, the image capture device 11 is an area array CCD. In addition, the device resolution of the image capture device 11 should match or be greater than the resolution of the proofing sheets so that the formed electronic signature image can display the dot details of the proofing sheets.
The image capture device 11 is calibrated and characterized in a standard light environment to ensure that the captured image is representative of the color characteristics in the standard light environment. Specifically, the correction and characterization process of the image capturing device 11 may include: (1) calibrating the image acquisition equipment 11 by adopting a standard white board and a standard black field, determining the black and white field of the image acquisition equipment, and performing linearization; (2) in a standard light environment, the image acquisition device 11 is used to capture color blocks of various known color characteristics (such as chromaticity), obtain corresponding spectrum or gray scale data, and establish a lookup table of the color characteristics and the spectrum or gray scale data to realize the characterization of the device.
In a specific application of the embodiment of the present application, an ICC color profile of the image capturing device 11 may be constructed by using the lookup table of the color characteristics and the spectrum or gray scale data, so as to implement, according to the ICC color profile, the conversion of chromaticity in the electronic signature image captured by the image capturing device 11, and implement, in cooperation with ICC profiles of subsequent color devices of other types, the conversion of color from a certain color space to another color space. In other applications of the embodiment of the present application, the color conversion relationship between the source device and the target device may also be directly established by directly using the aforementioned lookup table and other lookup tables.
The image sending device 12 is used for sending the electronic signature image to a remote client.
The remote client is a client which is not in the same position with the image acquisition device 11 and needs to be in communication interconnection. In a specific application, the remote client may be a client located at a client, or may be a client located inside a printing enterprise (such as a pre-press department).
After the electronic sample image is sent to the remote client, the remote client reads the electronic sample image and outputs the image corresponding to the electronic sample image on the configured display in a soft proofing mode.
It should be noted that the display is also a display that has been corrected and characterized to ensure that the display is capable of achieving a relatively accurate reproduction of colors. Because the display is characterized and the display gamut of the display is greater than the print gamut, using the display enables accurate reproduction of the colors represented in the electronic signature image; since the electronic signature image is the printed sample sheet collected by the image collecting device 11 and printed by the printing machine for final production, the electronic signature image truly reproduces the characteristics of the printed sample sheet printed by the printing machine; accordingly, the display is also able to accurately reproduce the final print color.
In addition, because the display configured by the remote client can realize proofing, the client can realize the proofing of the proofing sheet of the printing machine in the office without visiting a printing enterprise, and determine whether the proofing sheet can be used as a color standard proofing sheet for formal printing according to the proofing feeling, and then determine whether to perform electronic proofing.
In a specific application of the embodiment of the present application, the image collecting device 11 is further configured to collect reference printed sheets in a standard light environment to obtain a signature reference image; the electronic signature system for printed matter further comprises a processor 13.
The processor 13 is configured to compare chrominance values of corresponding pixels in the electronic signature image and the signature reference image to form color difference information.
The step of comparing the corresponding colorimetric values in the electronic signature image and the signature reference image by the processor 13 is: firstly, intercepting or rotating an electronic sample image and a sample reference image, determining a printing part in the electronic sample image and aligning the printing part; and then subtracting the chromatic values of corresponding pixels in the electronic sample image and the sample reference image to form color difference information.
The image transmission device 12 is also configured to transmit the color difference information to the remote client, so that the remote client outputs the color difference information.
In a specific application of this embodiment, the color difference information may be sent to the remote client as an individual file, or may be sent to the remote client along with the electronic signature image as a mask of the electronic signature image.
After receiving the color difference information, the remote client can check the corresponding pixel color difference information. In specific application, when a customer clicks a certain pixel in the electronic signature image, the color difference information of the corresponding pixel can be immediately searched and displayed.
In the electronic proof system for printed matters provided by the embodiment of the application, the processor 13 is further configured to identify a printing defect in a proof sample sheet; the image sending device 12 sends the electronic signature image to the remote client in the case where it is determined that the proof sheet has no detection defect.
In the specific application of the embodiment of the application, the proofing sample is a printing sample spliced into a large edition according to the splicing rule. The image acquisition equipment 11 is used for acquiring a proofing sample image in a standard environment to form a large-format sign image.
The processor 13 is configured to perform a folding process on the large-format signature image according to the split large-format to form an electronic signature image. Processing the large-format sample image according to the large-format splicing rule, comprising the following steps of: (1) formulating a folding rule according to the large edition splicing rule, splitting the large edition signature image to form a single-page electronic signature image; (2) and sequencing the electronic sample images of the single page according to a page sequence rule corresponding to the large page splicing rule to form a plurality of electronic sample images sequenced according to the page of the printed finished product.
After a plurality of electronic sample images sequenced according to printed finished products are sent to a remote client, the remote client can directly display the electronic sample images according to a single-page sequencing sequence, such as simultaneous display of page-crossing images; thus, the customer can directly check whether the printing color of the spread page meets the requirement.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An electronic signature method for printed matters, which is characterized by comprising the following steps:
adjusting the printing machine until a proofing sample sheet meeting the internal requirements of a printing enterprise is printed;
shooting the sample sheet by adopting image acquisition equipment in a standard light environment to form an electronic sample image; the image acquisition equipment is used for correcting and characterizing under a standard light environment;
and sending the electronic sample image to a remote client so that the remote client performs electronic sample according to the electronic sample image.
2. The electronic signature method of printed matter as recited in claim 1, further comprising:
shooting a reference printing sheet by adopting the image acquisition equipment in a standard light environment to form a sample-drawing reference image;
sending the signature reference image to the remote client; and/or the presence of a gas in the gas,
under the condition that the printing contents of the reference printed sheet and the proofing sample sheet are the same, comparing the colorimetric values of pixels corresponding to the electronic signature image and the signature reference image to form color difference information; and the number of the first and second groups,
and sending the color difference information to the remote client.
3. The electronic signature method of printed matter as recited in claim 1, further comprising:
identifying printing defects in the proofing sample sheet;
sending the electronic signature image to a remote client, comprising: and under the condition that the proofing sample sheet is determined to have no printing defects, the electronic signature image is sent to the remote client.
4. The electronic proof method for printed matter as claimed in claim 1,
the proofing sample sheet is a printing sheet spliced into a large edition according to the splicing rule;
adopt image acquisition equipment to shoot under standard environment the proof sample sheet forms the electron image of signing a sample, includes:
collecting the proofing sample sheet by adopting image collection equipment in a standard environment to form a large-version proofing image;
and processing the large-version signature images according to the large-version splicing rule to form a plurality of electronic signature images which are sequenced according to the pages of the printed finished products.
5. The printed electronic proofing method according to any of claims 1-4, wherein the satisfactory proofing sheets comprise:
the color control strip comprises a sampling sheet with color density or chroma meeting the standard requirement, and/or a sampling sheet with color density or chroma slightly lower than the standard requirement, and/or a sampling sheet with color density or chroma slightly higher than the standard requirement.
6. The printed matter electronic sampling method according to any one of claims 1 to 4, characterized by:
the image acquisition equipment is photographing type acquisition equipment or scanning type acquisition equipment.
7. An electronic signature system for printed matter, comprising:
the image acquisition equipment is used for acquiring the proofing sample sheet under the standard light environment to form an electronic sample image; the sample printing sheets are printed by the printer and meet the internal requirements of printing enterprises; the image acquisition equipment is used for correcting and characterizing under a standard light environment;
and the image sending equipment is used for sending the electronic signature image to a remote client.
8. The printed electronic proofing system according to claim 7,
the image acquisition equipment is also used for acquiring the reference printing sheet under the standard light environment to obtain a sample reference image; the reference printed sheet and the proofing sample sheet have the same printing content; the electronic signature system for the printed matter further comprises:
the processor is used for comparing the chromatic values of corresponding pixels in the electronic sample image and the sample reference image to form color difference information;
the image sending device is further configured to send the color difference information to the remote client, so that the remote client outputs the color difference information.
9. The printed electronic proofing system of claim 7, further comprising:
a processor for identifying printing defects in the proofing proofs;
and the image sending equipment sends the electronic sample signing image to the remote client under the condition that the sampling sample sheet is determined to have no detection defects.
10. The printed electronic proofing system according to claim 7,
the proofing sample sheet is a printing sheet spliced into a large edition according to the splicing rule;
the image acquisition equipment is used for acquiring the proofing sample image in a standard environment to form a large-version sign image;
the processor is used for processing the large-format signature image according to the large-format splicing rule to form a plurality of electronic signature images which are sequenced according to a printed finished product page.
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| CN202011021971.6A CN112233192A (en) | 2020-09-25 | 2020-09-25 | Electronic signature method and system for printed matter |
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