CN111045611A - Four-color high-fidelity printing process capable of realizing network low-precision pictures - Google Patents
Four-color high-fidelity printing process capable of realizing network low-precision pictures Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- 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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
- G06F3/1237—Print job management
- G06F3/1242—Image or content composition onto a page
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/001—Texturing; Colouring; Generation of texture or colour
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
Abstract
A four-color high-fidelity printing process capable of realizing network low-precision pictures belongs to the technical field of printing, and can realize the printing of network 'low-precision pictures, four-color printing high-definition and high-fidelity picture albums' through the modes of image acquisition, conversion, interpolation amplification and image leveling. The low-precision RGB picture can be selected at will, the high precision is better, and the selection range is wider; compared with the conventional four-color printing, the high-fidelity printing color gamut is enlarged by more than 30 percent, the capability of expressing bright colors is greatly improved, the gradation linearity of the printing colors of the high-fidelity printing color gamut is more accurate, and the capability of expressing the color depth change is strengthened; the linear adjustment of the brightness gradation of the user not only makes the color change more obvious in the dark color, but also enhances the stereoscopic impression of the printed image.
Description
Technical Field
The invention belongs to the technical field of printing, and particularly relates to a printing process capable of realizing network 'low-precision pictures, four-color printing, high-definition and high-fidelity picture albums'.
Background
In the prior art, due to various reasons such as shooting and storage, pictures compiled and printed by precious historical image data of a lot of important events, ancient calligraphy and painting and the like can only be downloaded from publicity websites such as large-scale photographic picture websites, colleagues, museums, auction companies and the like, and downloaded small pictures have low precision and can not be basically used for picture album printing.
Meanwhile, CMYK traditional four-color printing becomes a treasury in the printing world for decades, and is often used, but when painters, colleagues and photographers hold paintings which emit ink fragrance, the painters are face-to-face, so that the painters are different from the painters expected by original works in terms of seeing the painters, and the painters are disappointed by the face where the colors go, including government departments, business owners, advertisers and the like.
The original CMYK base color ink used for four-color printing has a large difference between the spectral curve of printing color development and the spectral curve of ideal color. The color development effects of the secondary colors CM, CY and MY of the ink overprinting are particularly blue and green, and are far from the ideal colors. The printing color is composed of a color component and a neutral gray component, and under the condition of limiting the using amount of the printing ink, if the neutral gray component is excessive, the brightness characteristic of a printing image is greatly distorted, and the using amount of the color component is relatively reduced, so that the color saturation is reduced. Conventional four color printing also represents a significant drawback at the expense of excessive color brightness. Therefore, compared with the colors of scenes and ancient calligraphy and painting in the nature, the traditional four-color printing is heavy in copy color, large in gradation distortion, unreal in layering sense and not strong in stereoscopic impression, and even if the precision of pictures is enough, the printing quality is not high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a technical scheme capable of realizing a printing process of a network picture album with low precision, high definition and high fidelity in four-color printing.
The printing process capable of realizing network printing of 'low-precision pictures, four-color printing, high-definition and high-fidelity picture albums' is characterized by comprising the following process steps:
1) taking materials, selecting a low-precision RGB picture which cannot be shot again on the network for processing,
2) converting the high-precision CMYK picture which is obtained by the step 1) through adjustment and high-fidelity color separation into an RGB picture, exporting a PDF file from the typeset RGB picture, and loading a four-color printing color characteristic file (icc) through an intelligence-converging software to perform high-fidelity color separation;
3) publishing the PDF file subjected to the high-fidelity color separation in the step 2) by an optional reach mixing screening technology;
4) and printing the PDF file published in the step 3) by adopting wide color gamut four colors.
The printing process capable of realizing network printing of 'low-precision pictures, four-color printing, high-definition and high-fidelity picture albums' is characterized in that the loading step of the intelligent convergence software in the step 2) is as follows:
a. to use high resolution 4K or 5K displays, this project used the art zho CG277 professional tone display resolution at 2560 x 1440, the displays were all set to ADOBE RGB (1998) or color corrected ICC, setting the resolution to maximum;
b. pressing a shortcut key F11, adjusting ctrl + to the maximum after the screen is full, and then capturing the image to obtain a 900 x 1440 image;
c. further repeating the operation on a display with higher resolution, and obtaining a PNG format 144ppi picture by using an apple computer;
d. entering Photoshop by using a JPG format file, storing the Photoshop as a TIFF format file, and then closing the original image;
e. setting the preferences: activating Camera RAW by RAW file, firstly setting [ preference ], selecting [ JPEG and TIFF processing ] as 'automatic opening … …', then selecting [ completion ] to quit Camera RAW, wherein the setting can be carried out in Photoshop [ preference ];
f. setting a work flow: opening an original JPEG or TIFF format file by Photoshop, preferentially entering CameraRaw, setting the CameraRaw as required to enter [ workflow option ], and selecting [ color space ] as AdobeRGB (1998) "," 16 bits/channel "; resolution in [ resize image ] bit "300 ppi pixels/inch"; and checking (opening as an intelligent object in Photoshop), and then (determining) closing the workflow option;
raw switching control: as shown in the figure, firstly, a histogram is observed to regulate the hue, then, chromatic aberration and noise regulation are carried out, and if a method of image amplification is tried, an object is directly selected to enter Photoshop if the definition is increased properly;
h. interpolation and amplification: selecting [ image ] - [ image size ] on a Photoshop menu, opening an attribute panel, clicking a menu button behind [ width ], changing ' pixel ' into ' percentage ', changing ' width ' or ' height ' into ' percentage ', setting the percentage ' as ' 130 ', then [ determining ] amplifying once, then reopening [ image size ], amplifying by ' 130 percentage ', after finishing amplifying, remembering to select a menu [ image layer ] - [ intelligent object ] (or [ deleting ] to return the intelligent image layer to a common image layer, and then sharpening or impressing film particles at the later stage to print high-quality pictures;
i. selecting a layer mixed mode on a layer adjusting plate as soft light to manufacture ICC, newly building a color gradation below a layer adjusting mode, selecting a red channel, setting an output color gradation to be 255, respectively finishing the setting of a yellow channel and a black channel by using the same method, returning to a cyan channel after finishing the setting to obtain a pure blue picture, adjusting by using an intermediate triangular handle to adjust to be suitable for clearly seeing the picture, newly building a curve in the layer adjusting mode, selecting the cyan channel, slightly darkening the highlight part by using the curve, using a painting tool to set a proper size and soft and hard pen touch, correcting the dark part at a mask position to make the dark part not too dark, newly building a curve in the layer adjusting mode, similarly selecting the cyan channel, slightly lightening the dark part by using the curve, and similarly using the painting tool, setting a proper size and soft and hard pen touch, correcting the bright part at the mask to make the bright part not too bright, copying the original image layer, stably storing the eyes of the color gradation layer, and selecting 4 image layers except the original layer for combination;
j. and newly building the color gradation under the layer adjustment mode, selecting cyan, yellow and black channels, setting the output color gradation to 255, and returning to a red channel after the setting is finished to obtain a pure red picture. And adjusting by using a middle triangular handle, adjusting to be suitable for seeing clearly the picture by self, newly building two curve layers, namely, adjusting a bright part and a dark part, so that a red channel looks soft, combining the layers, newly building a color level below a layer adjusting mode, selecting cyan, red and black channels, setting output color levels to be 255, returning to a yellow channel, repeatedly building two curve layers, namely, adjusting the bright part and adjusting the dark part, so that the yellow channel looks soft, deleting a saturation layer, combining the yellow channels, newly building the color level below the layer adjusting mode, selecting the cyan, red and yellow channels, setting the output color levels to be 255, returning to the black channel, and obtaining a pure black picture. And adjusting by using a middle triangular handle, adjusting to be suitable for seeing the picture clearly by self, repeatedly newly building two curve layers, namely a bright part and a dark part, so that a black channel looks soft, and obtaining a high-precision picture which can be used for printing.
The printing process capable of realizing the network 'low-precision picture, four-color printing high-definition and high-fidelity album' is characterized in that a four-color printing color characteristic file (icc) is generated in the step 2) in a multi-channel mode of a profilemaker.
The printing process capable of realizing the network printing of the 'low-precision picture, four-color printing high-definition and high-fidelity picture album' is characterized in that the Optida hybrid screening technology in the step 3) adopts four-color wide-color-gamut ink for printing.
The printing process capable of realizing network 'low-precision picture, four-color printing high-definition and high-fidelity album' is characterized in that base color ink is added in the wide-color-gamut four-color cmyk printing in the step 4), and all the base color ink except black ink participates in matching color components in input colors.
The printing process capable of realizing network 'low-precision picture, four-color printing high-definition and high-fidelity picture album' is characterized in that the base color ink comprises O, G, B and is overprinted with adjacent C, M, Y.
The printing process capable of realizing network 'low-precision picture, four-color printing high-definition and high-fidelity picture album' is characterized in that in the process of matching primary color ink with input colors, color components and neutral gray components in the ink colors formed after matching are respectively regulated and controlled, so that the visual effect of the brightness of the printed color image is close to the input hue, and the three-dimensional effect is achieved.
The printing process capable of realizing network 'low-precision picture, four-color printing high-definition and high-fidelity picture album' is characterized in that high-fidelity color separation is carried out in a color space to enable input RGB colors to obtain the brightness and chromaticity characteristics closer to spectral colors.
The printing process capable of realizing the network 'low-precision picture, four-color printing high-definition and high-fidelity picture album' is characterized in that the publishing link in the step 3) comprises plate making and plate washing, a screen 8600 thunderbolt CTP straight plate making machine is adopted by the plate making machine for the plate making, a Taiwan Wangchang plate is adopted by the plate washing machine for the plate washing, and the plate material for the publishing is a Fuji LH-PA heat-sensitive plate material.
The printing process capable of realizing network 'low-precision picture, four-color printing high-definition and high-fidelity picture album' is characterized in that the printing link in the step 4) comprises a printing machine, printing ink, paper, fountain solution and a rubber blanket, wherein the printing machine adopts a Japanese Xiaosen LS-440 four-color printing machine, the printing ink adopts STP BROAD wide color gamut printing ink, the paper adopts 157g/m2 coated paper of national gold east space shuttle, the fountain solution adopts Japanese Mingyi brand, and the rubber blanket adopts Japanese Mingzhi brand.
The invention has the following technical effects:
the low-precision RGB picture can be selected at will, the high precision is better, and the selection range is wider; compared with the conventional four-color printing, the high-fidelity printing color gamut is enlarged by more than 30 percent, the capability of expressing bright colors is greatly improved, the gradation linearity of the printing colors of the high-fidelity printing color gamut is more accurate, and the capability of expressing the color depth change is strengthened; the linear adjustment of the brightness gradation of the user not only makes the color change more obvious in the dark color, but also enhances the stereoscopic impression of the printed image.
Detailed Description
The present invention is further explained below.
A printing process capable of realizing network 'low-precision picture, four-color printing high-definition and high-fidelity picture album' comprises the following process steps: 1) Taking materials, wherein low-precision RGB pictures are randomly selected on the network for plate combination, and the high-precision RGB pictures are adopted for easier processing;
2) exporting the RGB pictures subjected to the edition combination in the step 1) to a PDF file, and loading a four-color printing color characteristic file (icc) through an intelligence-converging software to perform high-fidelity color separation; the color profile (icc) is printed in four colors in a multi-channel manner by a profilemaker. The high fidelity color separation is performed in the color space to make the input RGB colors obtain the brightness and chromaticity characteristics closer to the spectral colors.
The specific software is loaded as follows:
image acquisition
1. First, we find the calendar paintings related to the culture on the network to select the question.
2. However, the downloaded low-precision pictures cannot be used for album printing basically, but the pictures with higher precision cannot be found, and the collection house or the museum cannot shoot again, so that the technical difficulty must be broken through, and the adjustment is carried out on the basis of the network low-precision pictures, so that the high-precision pictures meet the printing requirements of high definition and high fidelity. The specific method comprises the following steps: firstly, a high-resolution 4K or 5K display is used, and the resolution of the technical android CG277 special mapping display is 2560 x 1440. The displays are set to ADOBERGB (1998) or color corrected ICC. The resolution is set to maximum.
3. The shortcut key F11 maximizes ctrl + after full screen and then captures a 900 x 1440 image, which is clearly superior to direct download.
4. Further repeating the operation on a higher resolution display, a PNG format 144ppi picture can also be obtained using an apple computer.
Image conversion
1. And (4) entering Photoshop by using a JPG format file, storing the Photoshop as a TIFF format file (the TIFF option is selected as default), and then closing the original image.
2. And setting the preference. The Camera RAW is activated with the RAW file. First set [ preferences ], select [ JPEG and TIFF processing ] as "auto open … …". Then choose [ done ] to exit Camera Raw. This setting can also be done in Photoshop [ preference ]. .
3. And setting a workflow. The original JPEG or TIFF format file is opened by Photoshop, and the Camera Raw is entered preferentially. Must enter its [ workflow option ] to set (bottom red arrow), select [ color space ] as "AdobeRGB (1998)", "16 bits/channel"; resolution in [ resize image ] bit "300 ppi pixels/inch"; and check [ open as smart object in Photoshop ]. Then [ determine ] closes the workflow option.
RAW switching control. Firstly, watching a histogram to regulate and control the tone (mainly brightening and digging dark part details in the example), and then carrying out color difference and noise regulation and control, wherein the definition is properly increased (instead of regulation and sharpening). If only trying the method of image enlargement, then select [ open object ] directly to enter Photoshop.
The purpose of the above RAW conversion is to convert the 8-bit color depth, low resolution (72/144) of the original image into an image file of 16-bit color depth 300 ppi.
Interpolation amplification
The last step checks the workflow option of Camera raw [ open as smart object in Photoshop ], then enter Photoshop see smart object layer on its [ layer ] panel. If the Camera Raw does not select to open the intelligent object, the ordinary image layer after entering Photoshop can be menu-selected [ image layer ] - [ intelligent object ] - [ convert to intelligent object ].
Now start interpolation zoom in, select [ image ] on the Photoshop menu [ image size ] open its property panel. The mouse clicks the menu button behind (width), changing the pixel to percentage. In addition, interpolation zoom-in (or zoom-out), also known as "resampling (re-pixelation)" requires mathematical algorithm support, and is now used for zoom-in with "auto", "preserve detail (zoom)" and "cubic twice (smoother)". The strict user compares three effects according to different images, and the embodiment only needs to use the "detail preservation (expansion)". The successive enlargements are that the width (or the height) is changed into the percentage and is set as 130, and then the enlargement is performed once. Then reopen [ image size ] and zoom in once again at "130 percent". Such successive enlargements are generally not more than 4 times or image details are severely lost. After the zooming is completed, a selection menu (image layer) (intelligent object) (or grid deletion) is memorized, and the intelligent image layer is attributed to the common image layer. This example is enlarged 4 times to obtain an image of the long side 4113 pixels. High quality pictures can be printed and output through other post-processing (such as sharpening and stamping film grains). A smart object is a method of Photoshop lossless operation. And (5) processing of basic sharpening. And (3) copying a layer by using a shortcut key Ctrl + J, selecting a filter (other), and a high contrast retention (high contrast retention), regulating and controlling a radius (with the high contrast retention) attribute to enable the lines of the pattern to be at the first moment (about an empirical value of 1-3), and selecting (determining) to quit. And the image layer mixed mode on the image adjusting plate is selected as soft light to finish calculation. So far, the small diagram is converted into the work flow of the large diagram to complete the difference between the small diagram and the large diagram.
Fourth, image leveling
Through the processing, the pixels of the image basically meet the printing requirement, but the product has uneven water wave texture due to light and the original wrinkle relation of the paper and needs to be further processed.
1. The pictures are converted into the company color management made ICC, G7 BLACK _ V3.
2. And establishing the color level under the layer adjusting mode. The red channel is selected and the output tone scale is set to 255. The same method is used for the yellow channel and the black channel respectively. And returning to the cyan channel after the setting is finished to obtain a picture of pure blue. Then the middle triangular handle is used for adjustment, and the picture contrast is good when the middle triangular handle is adjusted to be suitable for seeing clearly. And then, a curve in the layer adjustment mode is newly established. The cyan channel is selected and the highlight portion is slightly darkened with a curve. The dark part is corrected at the mask by setting a proper size and soft and hard pen strokes by using a painting brush tool, so that the dark part cannot be too dark. And a new curve in the adjustment mode is established.
The cyan channel is also selected and the curve is used to slightly highlight the dark portion.
And similarly, a painting brush tool is used, a proper size and soft and hard pen touch are set, and the bright part is corrected at the mask to make the bright part not too bright. The adjusted cyan channel is overall softer, and the comparison is performed before and after adjustment. Copying the original image layer, storing the eyes of the color gradation layer stably, and selecting 4 image layers except the original layer for combination.
And repeating the point 2, newly building the color levels under the layer adjustment mode, selecting cyan, yellow and black channels, and setting the output color levels to be 255. And returning to the red channel after the setting is finished to obtain a pure red picture. Then the middle triangular handle is used for adjustment, and the picture contrast is good when the middle triangular handle is adjusted to be suitable for seeing clearly. Two curve layers are repeatedly newly built, namely a bright part is adjusted, and a dark part is adjusted, so that a red channel looks soft. And combining the layers. And newly building the color gradation under the layer adjustment mode, selecting cyan, red and black channels, setting the output color gradation to 255, and returning to the yellow channel. The yellow channel does not appear to be so obvious that building saturation in the layer makes it appear more clearly suitable for operation. Two curve layers are repeatedly newly built, wherein one curve layer is used for adjusting the bright part, and the other curve layer is used for adjusting the dark part, so that the yellow channel looks soft. And deleting the saturation layer (pulling the strip-shaped red frame into the garbage can with the small square frame). Yellow channel comparison before and after adjustment. The yellow channels were combined. And newly building the color gradation under the layer adjustment mode, selecting cyan, red and yellow channels, setting the output color gradation to 255, and returning to the black channel. A pure black picture is obtained. Then the middle triangular handle is used for adjustment, and the picture contrast is good when the middle triangular handle is adjusted to be suitable for seeing clearly. Two curve layers are repeatedly newly built, namely a bright part is adjusted, and a dark part is adjusted, so that a black channel looks soft and merges the layers. Through numerous repeated tests, a high-precision picture which can be used for printing is obtained, and the high-precision picture is the first step of high-definition and high-fidelity printing work.
3) Publishing the PDF file subjected to the high-fidelity color separation in the step 2) by an optional reach mixing screening technology; the Optida mixing screening technology adopts wide-color-gamut printing ink, and the ink pigment has high purity and extremely fine grinding fineness. The publishing link comprises plate making and plate punching, wherein the plate making machine for plate making adopts a screen 8600 thunderbolt CTP straight plate making machine, the plate punching machine for plate punching adopts a Taiwan Wangchang plate, and the plate material for publishing is a Fuji LH-PA thermosensitive plate material.
4) And printing the PDF file published in the step 3) by adopting wide color gamut four colors. And base color ink is added in the wide-color-gamut four-color printing, and all the base color ink except black ink participates in matching color components in input colors. The base color ink includes O, G, B and is overprinted with adjacent C, M, Y. In the process of matching the primary color ink with the input color, the color components and the neutral gray components in the ink color formed after matching are respectively regulated and controlled, so that the visual effect of the brightness of the printed color image is close to the input hue, and the three-dimensional effect is achieved. The printing link comprises a printing machine, printing ink, paper, fountain solution and a rubber blanket, wherein the printing machine adopts a Japanese Xiaosen LS-440 four-color printing machine, the printing ink adopts STP BROAD wide-color-gamut printing ink, the paper adopts 157g/m2 coated paper of national gold east space shuttle, the fountain solution adopts a Nissan Mingmi brand, and the rubber blanket adopts a Japanese Mingmi brand. The four colors of the wide color gamut are k (black), c (cyan), m (magenta) and y (yellow), and the printing color sequence is as follows: k-c-m-y. The display parameters are set as follows: color temperature 5000K, brightness 110cd/M2, Gamma value 1.8, plate data at 50% K:31, C:25.5, M:24, Y: 33.5.
High-definition and high-fidelity printing needs to effectively control offset printing dot expansion and dot expansion rate, and high-quality prints are vivid in impression at first sight. The patterns are flat, the dots are solid, the overprinting is accurate, and the layers are rich for discrimination. The rich layers are required to perfectly reproduce the mesh points with various densities. The dots of the high-quality prints are always full in ink color, regular in shape and clear in edge when observed by a microscope. On the premise of adjusting a low-precision picture, the factor of generating dot enlargement in the whole printing process is controlled well, the dot enlargement rate is controlled within a smaller range, 1% of small dots are not lost, 50% of dots are not enlarged, and 99% of dots are not blurred.
The printing of 'low-precision pictures, four-color printing high-definition and high-fidelity picture albums' is ensured to be smoothly implemented by the control of the following seven aspects:
1. controlling ink transfer: the transfer of ink is accomplished by means of an ink roller. The rubber roller is maintained once a month to ensure that the hardness range is between HS23-42, the surface of the rubber roller has no vitrification phenomenon, and the rubber roller has good ink transmission performance, so that the mesh point on the printing plate can store enough ink.
2. Normalized ink storage temperature: the printing ink is stored in a constant-temperature storage box with the temperature of 29 ℃ and the humidity of 50 ℃, so that the fluidity of the printing ink is effectively ensured.
3. Selecting a rubber cloth with good printability: offset printing uses a blanket to transfer ink on dots, and a japanese mingzhi blanket with good printing adaptability is selected. In the printing process, the adhesion of paper wool, paper powder, residual ink particles, fountain solution and sprayed powder on the surface of the rubber blanket and the friction in high-speed operation greatly reduce the ink transfer performance of the rubber blanket, cause the phenomena of fuzzy dots, false floating on the spot and the like, and directly influence the quality of printed matters, so the cleaning flow must be standardized to keep the surface of the rubber blanket clean so as to exert the optimal effect.
4. Controlling the printing pressure: the transfer of the inks of the dots of the offset printing plate must be effected by the printing pressure, which directly influences the ink transfer, and it is very important to correctly adjust the operating pressure of the printing press. The printing pressure is unstable, the ink transfer is sometimes excessive, sometimes insufficient, the tone reproduction and color restoration of the printed matter cannot achieve the expected effect, and the high-quality printed matter can be obtained only within the proper printing pressure range and is kept stable. The selection and guarantee of the correct printing pressure become an important part of the printing process.
5. Selecting a proper paper: the printability of a paper depends on the surface properties of the paper, such as the amount and receptivity to ink. The faster the absorption rate, the greater the degree of dot gain of the print. The ink absorption speed of the paper plays a key role in the dot gain. The higher the smoothness of the paper, the smaller the dot gain value; the lower the smoothness of the paper, the greater the dot gain value. The paper adopts 157g/m2 coated paper of China-made Jindong space shuttle.
6. The printing speed is controlled at 10000 sheets/hour: variations in printing speed directly affect the quality of the product. When the printing pressure is set, the printing speed is reduced, the contact time between the printing surfaces is prolonged, the contact of the printing surfaces is sufficient, the transfer rate of the printing ink is high, the ink absorption of the mesh points is full, and the color of the image ink is bright. When the printing speed is increased, the contact time between the opposite printing surfaces is shortened, the printing surfaces cannot be fully contacted, the transfer rate of ink is low, the ink absorption of dots is insufficient, and the image is whitish. The printing speed is controlled to ensure that the front and back ink colors of the four-color printed high-definition and high-fidelity picture album are consistent.
7. 350dpi/in screening printing is adopted, wherein the higher the screening line number is, the clearer the printed product is, in order to realize the printing process of 'low-precision picture, four-color printing high-definition and high-fidelity picture book', a mixed screening technology of 350dpi/in is adopted, but the first 6 items are really made in place to realize 350dpi/in printing.
Claims (10)
1. A printing process capable of realizing network 'low-precision picture, four-color printing high-definition and high-fidelity picture album' is characterized by comprising the following process steps:
1) taking materials, selecting a low-precision RGB picture which cannot be shot again on the network for processing,
2) converting the high-precision CMYK picture which is obtained by the step 1) through adjustment and high-fidelity color separation into an RGB picture, exporting a PDF file from the typeset RGB picture, and loading a four-color printing color characteristic file (icc) through an intelligence-converging software to perform high-fidelity color separation;
3) publishing the PDF file subjected to the high-fidelity color separation in the step 2) by an optional reach mixing screening technology;
4) and printing the PDF file published in the step 3) by adopting wide color gamut four colors.
2. The printing process capable of realizing network printing of 'low-precision pictures, four-color printing, high-definition and high-fidelity picture albums' as claimed in claim 1, wherein the loading step of the intelligence-gathering software in the step 2) is as follows:
a. to use high resolution 4K or 5K displays, this project used the art zho CG277 professional tone display resolution at 2560 x 1440, the displays were all set to ADOBE RGB (1998) or color corrected ICC, setting the resolution to maximum;
b. pressing a shortcut key F11, adjusting ctrl + to the maximum after the screen is full, and then capturing the image to obtain a 900 x 1440 image;
c. further repeating the operation on a display with higher resolution, and obtaining a PNG format 144ppi picture by using an apple computer;
d. entering Photoshop by using a JPG format file, storing the Photoshop as a TIFF format file, and then closing the original image;
e. setting the preferences: activating Camera RAW by RAW file, firstly setting [ preference ], selecting [ JPEG and TIFF processing ] as 'automatic opening … …', then selecting [ completion ] to quit Camera RAW, wherein the setting can be carried out in Photoshop [ preference ];
f. setting a work flow: opening an original JPEG or TIFF format file by Photoshop, preferentially entering CameraRaw, setting the CameraRaw as required to enter [ workflow option ], and selecting [ color space ] as AdobeRGB (1998) "," 16 bits/channel "; resolution in [ resize image ] bit "300 ppi pixels/inch"; and checking (opening as an intelligent object in Photoshop), and then (determining) closing the workflow option;
raw switching control: as shown in the figure, firstly, a histogram is observed to regulate the hue, then, chromatic aberration and noise regulation are carried out, and if a method of image amplification is tried, an object is directly selected to enter Photoshop if the definition is increased properly;
h. interpolation and amplification: selecting [ image ] - [ image size ] on a Photoshop menu, opening an attribute panel, clicking a menu button behind [ width ], changing ' pixel ' into ' percentage ', changing ' width ' or ' height ' into ' percentage ', setting the percentage ' as ' 130 ', then [ determining ] amplifying once, then reopening [ image size ], amplifying by ' 130 percentage ', after finishing amplifying, remembering to select a menu [ image layer ] - [ intelligent object ] (or [ deleting ] to return the intelligent image layer to a common image layer, and then sharpening or impressing film particles at the later stage to print high-quality pictures;
i. selecting a layer mixed mode on a layer adjusting plate as soft light to manufacture ICC, newly building a color gradation below a layer adjusting mode, selecting a red channel, setting an output color gradation to be 255, respectively finishing the setting of a yellow channel and a black channel by using the same method, returning to a cyan channel after finishing the setting to obtain a pure blue picture, adjusting by using an intermediate triangular handle to adjust to be suitable for clearly seeing the picture, newly building a curve in the layer adjusting mode, selecting the cyan channel, slightly darkening the highlight part by using the curve, using a painting tool to set a proper size and soft and hard pen touch, correcting the dark part at a mask position to make the dark part not too dark, newly building a curve in the layer adjusting mode, similarly selecting the cyan channel, slightly lightening the dark part by using the curve, and similarly using the painting tool, setting a proper size and soft and hard pen touch, correcting the bright part at the mask to make the bright part not too bright, copying the original image layer, stably storing the eyes of the color gradation layer, and selecting 4 image layers except the original layer for combination;
j. newly building a color level under the layer adjustment mode, selecting cyan, yellow and black channels, setting the output color level to be 255, and returning to a red channel after the setting is finished to obtain a pure red picture;
adjusting by using a middle triangular handle, adjusting to be suitable for seeing clearly the picture by self, newly building two curve layers, namely a bright part and a dark part, so that a red channel looks soft, combining the layers, newly building a color level under a layer adjusting mode, selecting cyan, red and black channels, setting output color levels to be 255, returning to a yellow channel, repeatedly building two curve layers, namely a bright part and a dark part, so that a yellow channel looks soft, deleting a saturation layer, combining the yellow channels, newly building the color level under the layer adjusting mode, selecting cyan, red and yellow channels, setting the output color levels to be 255, returning to a black channel, and obtaining a pure black picture;
and adjusting by using a middle triangular handle, adjusting to be suitable for seeing the picture clearly by self, repeatedly newly building two curve layers, namely a bright part and a dark part, so that a black channel looks soft, and obtaining a high-precision picture which can be used for printing.
3. The process of claim 1, wherein the step 2) of generating the four-color printing color characteristic file (icc) in a multi-channel manner via a profilemaker is performed.
4. The printing process of claim 1, wherein the step 3) of printing the network low-precision picture, four-color high-definition and high-fidelity picture album uses four-color wide-color-gamut ink.
5. The process of claim 1, wherein in the step 4), base color inks are added in the wide color gamut four-color cmyk printing, and all of the base color inks except black ink participate in matching color components in input colors.
6. The process of claim 5, wherein the primary color ink comprises O, G, B and is overprinted with C, M, Y adjacent thereto.
7. The printing process capable of realizing network 'low-precision picture, four-color printing high-definition and high-fidelity picture album' as claimed in claim 5, wherein in the process of matching the primary color ink with the input color, the color components and the neutral gray components in the ink color formed after matching are respectively regulated and controlled, so that the visual effect of the brightness of the printed color image is close to the input color phase to achieve the three-dimensional effect.
8. The process of claim 1, wherein the high fidelity color separation is performed in color space to obtain the brightness and chromaticity characteristics of the input RGB colors closer to the spectral colors.
9. The printing process of claim 1, wherein the publishing step of step 3) comprises plate making and plate washing, the plate making machine for plate making adopts a screen 8600 thunderbolt CTP straight plate making machine, the plate washing machine for plate washing adopts Taiwan Wangchang, and the plate material for publishing is Fuji LH-PA heat-sensitive plate material.
10. The printing process of claim 1, wherein the printing links of step 4) include printing press, ink, paper, fountain solution, and blanket, the printing press adopts a japanese Xiaosen LS-440 four-color printing press, the ink adopts STP BROAD color gamut ink, the paper adopts 157g/m2 coated paper of national kingdom space shuttle, the fountain solution adopts japanese lapping plate, and the blanket adopts japanese Mingmu plate.
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