CN115027161B - Color printing method for multicolor overprinting under fluorescent lamp - Google Patents
Color printing method for multicolor overprinting under fluorescent lamp Download PDFInfo
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- CN115027161B CN115027161B CN202210889035.XA CN202210889035A CN115027161B CN 115027161 B CN115027161 B CN 115027161B CN 202210889035 A CN202210889035 A CN 202210889035A CN 115027161 B CN115027161 B CN 115027161B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000000926 separation method Methods 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 claims description 2
- 238000005286 illumination Methods 0.000 abstract description 10
- 238000011161 development Methods 0.000 abstract description 6
- 239000000976 ink Substances 0.000 description 21
- 239000003086 colorant Substances 0.000 description 11
- 239000000049 pigment Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 235000021022 fresh fruits Nutrition 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/06—Veined printings; Fluorescent printings; Stereoscopic images; Imitated patterns, e.g. tissues, textiles
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Abstract
The invention discloses a color printing method of multicolor overprinting under a fluorescent lamp, which relates to the technical field of fluorescent printing and aims to improve the color development effect of fluorescent printing in the prior art, and comprises the following steps: step S1: performing RGB color separation treatment on an image to be printed according to a color light adding method principle; step S2: manufacturing RGB printing files; step S3: making a layout, and performing hair extension; step S4: adjusting the proportion of RGB fluorescent ink according to the RGB color separation processing result, and printing the image according to the format; the invention has the advantages of better printing effect and brighter color under daily illumination and special illumination.
Description
Technical Field
The invention relates to the technical field of fluorescent printing, in particular to the technical field of a color printing method of multicolor overprinting under a fluorescent lamp.
Background
Fluorescent ink is one of the inks used in ticket printing, and the main component of the fluorescent ink is fluorescent pigment. Fluorescent pigments are functional luminescent pigments, which are different from general pigments in that they absorb energy of a certain form when irradiated with external light, and excite photons to release the absorbed energy in a low visible form, thereby generating fluorescent phenomena of different hues. The light of different colors combines to form an abnormally vivid color, and when the light stops being irradiated, the luminescence phenomenon disappears, and thus is called a fluorescent pigment.
In fluorescent printing, the display effects under two different conditions of daily illumination and special illumination are required to be displayed, so that the problem that the effects are difficult to consider is inevitably solved, the color is generally allocated through the color values of CMYK in the prior art, and the printing effect is required to be improved in the aspects of color development effect, brightness and the like.
The color development fresh fruit of fluorescent printing can be improved by realizing more proper fluorescent ink proportion adjustment through better color separation operation.
Disclosure of Invention
The invention aims at: the color development effect of fluorescent printing in the prior art is improved. In order to solve the technical problems, the invention provides a color printing method for multicolor overprinting under a fluorescent lamp.
The invention adopts the following technical scheme for realizing the purposes:
a color printing method for multicolor overprinting under fluorescent lamps, comprising the steps of:
step S1: performing RGB color separation treatment on an image to be printed according to a color light adding method principle;
step S2: manufacturing RGB printing files;
step S3: making a layout, and performing hair extension;
step S4: and adjusting the proportion of RGB fluorescent ink according to the RGB color separation processing result, and printing the image according to the format.
Preferably, in the step S1, the method for performing RGB color separation processing on an image according to the principle of color light addition method includes:
step S101: splitting the image into an R-graph, a G-graph, a B-graph and a W-graph based on a split of RGB images;
step S102: performing inverse color operation on the R graph, the G graph and the B graph respectively;
step S103: the R graph, the G graph and the B graph after the color reversing operation are respectively manufactured into special red, special green and special blue special color printing plates, and the W graph part is separately processed to separately manufacture white printing plates;
step S104: and performing image processing on the image according to a color tendency of the image before the RGB color separation processing according to a color adding method and a color subtracting method.
Preferably, the method of the color reversing operation in the step S102 is as follows: the inversion is performed by image processing or the adjustment is performed by image curves.
Preferably, in the step S2, the method for making the RGB printed file is: the four-color CMYK file is converted into an RGB file.
Preferably, in the step S3, the hair-setting mode is an amplitude modulation network hair-setting mode.
Preferably, in the step S3, the number of the net wires used in the hair band is 300 wires.
Preferably, in the step S3, the screening angle used in the hair band is R40 degrees, G13 degrees, B85 degrees, and w70 degrees.
Preferably, after the step S4, the printing effect of the printed product is confirmed under the daily illumination and the ultraviolet illumination, respectively.
The beneficial effects of the invention are as follows:
the invention carries out color separation on the image to be printed by the principle of a chromatic light color adding method, calculates the proportion of RGB ink, can carry out fine adjustment according to the actual image effect, and restores the color developing effect actually required by the image; the invention adopts RGB to directly allocate, is simple and convenient to operate when fine adjustment is carried out according to the actual image effect, has obvious effect and can be quickly adjusted to a required value; the color of the printed finished product has higher brightness, and the color of the printed finished product is more fresh, so that the printed finished product has better color development effect under daily illumination and special illumination; the hair-setting scheme selected by the invention can make the image finer; the invention finally checks the printed finished product to prevent defective products, and further ensures that the effect of the printed finished product meets the requirement.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic diagram of the first reverse operation of example 1;
FIG. 3 is a schematic diagram of a second inverse color operation of example 1;
fig. 4 is a schematic diagram of the third inverse color operation of example 1.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the embodiment provides a color printing method for multicolor overprinting under fluorescent lamps, which includes the following steps:
step S1: performing RGB color separation treatment on an image to be printed according to a color light adding method principle;
step S2: manufacturing RGB printing files;
step S3: making a layout, and performing hair extension;
step S4: and adjusting the proportion of RGB fluorescent ink according to the RGB color separation processing result, and printing the image according to the format.
The basic implementation principle of this embodiment is as follows:
the traditional fluorescent printing method prints the most suitable and matched colors according to the color values of the adjusted CMYK. The method adopted in the embodiment calculates the RGB color value corresponding to the hue of the common CMYK ink by carrying out RGB color separation processing on the actual image, thus the deviation of the color can be judged rapidly and conveniently in the later printing process, and the adjustment can be purposefully carried out.
As a preferred solution of this embodiment, in step S1, the method for performing RGB color separation processing on an image according to the principle of color light addition method includes:
step S101: splitting the image into an R-graph, a G-graph, a B-graph and a W-graph based on a split of RGB images;
step S102: performing inverse color operation on the R graph, the G graph and the B graph respectively; the inverse color operation, i.e., performing an inverse color conversion operation, is described with reference to fig. 2, fig. 3 and fig. 4, and fig. 2-4 are: the left side of the figure is an image before the color reversal operation, and the right side is an image after the color reversal operation;
step S103: the R graph, the G graph and the B graph after the color reversing operation are respectively manufactured into special red, special green and special blue special color printing plates, and the W graph part is separately processed to separately manufacture white printing plates;
step S104: and performing image processing on the image according to a color tendency of the image before the RGB color separation processing according to a color adding method and a color subtracting method.
Further, the method of the color reversal operation in the step S102 is as follows: the inversion is performed by image processing or the adjustment is performed by image curves. Specifically, for example, the inverse operation is realized through some basic image processing software, or the brightness and darkness values of the image can be adjusted through curve adjustment, so that the adjustment can also realize the inverse operation of the image.
The traditional printing four-color separation mode (CMYK) is a color-matching mode adopted in color printing, and utilizes the principle of three primary colors of pigment mixed with black ink to form so-called full-color printing in total, while the color separation mode adopted in the printing process in the embodiment is to separate colors by utilizing the principle of a chromatic light additive method, and then printing is carried out. The essence of the color adding method is a color method for generating new color light by mixing color light and color light, which specifically comprises the following steps:
(1) Since white light containing all light can be obtained by adding energy of three primary colors of light, there is R (red) +g (green) +b (blue) =w (white)
(2) When the three primary colors are added in unequal amounts, the color shift ratio is larger.
(3) Adding the light of any two of the three primary colors in equal amounts can obtain cyan (C), magenta (M) and yellow (Y), namely:
G+B＝C,C+R＝W；
R+G＝Y,Y+B＝W；
B+R＝M,M+G＝W；
(4) The brightness of the primary color light after mixing is higher than that of the original color light, so the color after printing is brighter by using the method.
Example 2
The present embodiment is based on the technical solution of embodiment 1, and the basic steps are as follows:
a color printing method for multicolor overprinting under fluorescent lamps, comprising the steps of:
step S1: performing RGB color separation treatment on an image to be printed according to a color light adding method principle;
step S2: manufacturing RGB printing files;
step S3: making a layout, and performing hair extension;
step S4: and adjusting the proportion of RGB fluorescent ink according to the RGB color separation processing result, and printing the image according to the format.
Preferably, in the step S2, the method for making the RGB printed file is: the four-color CMYK file is converted into an RGB file.
On the other hand, in the related art, printing is generally performed by adjusting color values of CMYK. The CMYK mode is a color mode in which when sunlight irradiates an object, the object absorbs a part of the light and reflects the rest of the light, and the reflected light is a subtractive color mode of the object color that we see, and is fundamentally different from the RGB mode. According to this subtractive color pattern, a CMYK color pattern suitable for printing is derived. Not only is this subtractive pattern used when looking at the color of the object, but it is also applied when printing on paper. CMYK represents four colors used on printing, C represents Cyan (Cyan), M represents Magenta (Magenta), Y represents Yellow (Yellow), and K represents Black (Black). Because in practice cyan, magenta and yellow are difficult to superimpose to form true black, but at best brown. Therefore, K-black is introduced. The black color has the function of strengthening the dark tone and deepening the color of the dark part.
In contrast, RGB colors are so-called optical three primary colors, R represents Red (Red), G represents Green (Green), and B represents Blue (Blue). Any color visible to the naked eye in nature can be formed by mixing and superposing the three colors, so that the color-adding mode is also called. The RGB mode is also called RGB color space. The color light is a color pattern of color light, and is widely used in our life, such as television, computer display screen, slide show, etc., which are colored by light. In printing and publishing, an image is often required to be scanned, and the scanner firstly extracts RGB color light information on an original image during scanning. The RGB mode is an additive color mode, and any color can be described by the radiation amount of R, G, B.
We can build both CMYK and RGB into the Lab coordinate system where a larger value for L is 0 to 100 indicates a brighter color, a represents a green to red change, and b represents a blue to yellow change.
The Lab values of CMYK represent Lab values of common ink, lab values of R and Lab values of G in the above graph are obtained through experimental tests, and then the hue parameters of Y close to the visual effect suitable for human are calculated by adjusting the ink hues of R and G according to the principle of r+g=y. Similarly, in the equation g+b=c, the Lab hue value of B is calculated from the Lab hue value of the common ink C, knowing the GLab hue value. In equation b+r=m, the Lab hue value of B is calculated from the Lab hue value of the common ink M, knowing the Lab hue value. The R fluorescent ink, the G fluorescent ink and the B fluorescent ink are determined by the method, and the printing effect shown under the fluorescent lamp is printed by the parameters such as the fluorescent hue content, the number and angle of the emitted net wires, the image curve, the fluorescent toner particles and the like in the ink.
Therefore, in actual printing, RGB fluorescent ink which reaches balance needs to be selected first, that is, equal amounts of R, G and B in the ink are added to obtain the ink just as W, and then the printing color is modulated according to the color separation condition in the steps of the embodiment.
In a preferred embodiment, in step S3, the hair-setting mode is an amplitude modulation net hair-setting mode.
Preferably, in the step S3, the number of the net wires used in the hair bank is 300 wires.
As another preferred embodiment, in the step S3, the screening angle used in the hair band is R40 degrees, G13 degrees, B85 degrees, and w70 degrees.
Example 3
This embodiment is based on the technical scheme of embodiment 1.
The improvement is that in this embodiment, after the step S4, the printing effect of the printed product is confirmed under the daily illumination and the ultraviolet light illumination, respectively.
The print effects are respectively confirmed to ensure that the print quality meets the requirements, such as color development condition, definition and the like, and the confirmation is calculated and qualified.
Claims (7)
1. A color printing method for multicolor overprinting under fluorescent lamps, comprising the steps of:
step S1: performing RGB color separation treatment on an image to be printed according to a color light adding method principle;
step S2: manufacturing RGB printing files;
step S3: making a layout, and performing hair extension;
step S4: adjusting the proportion of RGB fluorescent ink according to the RGB color separation processing result, and printing the image according to the format;
wherein, the step S1 includes:
step S101: splitting the image into an R-graph, a G-graph, a B-graph and a W-graph based on a split of RGB images;
step S102: performing inverse color operation on the R graph, the G graph and the B graph respectively;
step S103: the R graph, the G graph and the B graph after the color reversing operation are respectively manufactured into special red, special green and special blue special color printing plates, and the W graph part is separately processed to separately manufacture white printing plates;
step S104: performing image processing on the image according to a color tendency of the image before RGB color separation processing and a color light adding method and a color light subtracting method;
wherein, the step of adjusting the proportion of the RGB fluorescent ink according to the result of the RGB color separation process comprises:
obtaining a Lab value of R and a Lab value of G of the image through experimental tests, and obtaining a Y hue parameter which is close to a visual effect suitable for people according to the sum of the Lab value of R and the Lab value of G;
obtaining a Lab value of the common ink C, and subtracting the Lab value of the C from the Lab value of the G to obtain a Lab value of the B;
obtaining a Lab value of the common ink M, and subtracting the Lab value of the B from the Lab value of the M to obtain a Lab value of the R;
determining the fluorescent hue content in the ink according to the Y hue parameter, determining the proportion of the R fluorescent ink according to the Lab value of R, determining the proportion of the G fluorescent ink according to the Lab value of G, and determining the proportion of the B fluorescent ink according to the Lab value of B;
and printing the image according to the pattern according to the fluorescent hue content, the R fluorescent ink proportion, the G fluorescent ink proportion, the B fluorescent ink proportion, the number and angle of the emitted net wires, the image curve and the fluorescent toner particle parameters.
2. The method for color printing of multi-color overprinting under fluorescent lamps according to claim 1, wherein said method for reversing color operation in step S102 is as follows: the inversion is performed by image processing or the adjustment is performed by image curves.
3. The method for color printing of multi-color overprinting under fluorescent lamps according to claim 1, wherein in the step S2, the method for producing RGB printed documents is as follows: the four-color CMYK file is converted into an RGB file.
4. The method according to claim 1, wherein in the step S3, the hair-line pattern is an amplitude modulation net hair-line pattern.
5. The method according to claim 4, wherein in the step S3, the number of screening lines used in the hairline is 300 lines.
6. The method according to claim 5, wherein in the step S3, the screening angle used in the hairline is R40 degrees, G13 degrees, B85 degrees, and w70 degrees.
7. The method according to claim 1, wherein after step S4, the printing effect of the printed product is confirmed under the irradiation of daily light and violet light, respectively.
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