CN115027161A

CN115027161A - Multicolor overprinting color printing method under fluorescent lamp

Info

Publication number: CN115027161A
Application number: CN202210889035.XA
Authority: CN
Inventors: 燕其廷; 黄卫萍; 邹建; 张蕾
Original assignee: Henan Posts And Telecommunications Technology Co ltd
Current assignee: Henan Posts And Telecommunications Technology Co ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-09-09
Anticipated expiration: 2042-07-27
Also published as: CN115027161B

Abstract

The invention discloses a multicolor overprinting color printing method under a fluorescent lamp, relates to the technical field of fluorescent printing, 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 processing on an image to be printed according to a color light additive method principle; step S2: making an RGB printing file; step S3: making a format and performing haircut; 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

Multicolor overprinting color printing method under fluorescent lamp

Technical Field

The invention relates to the technical field of fluorescent printing, in particular to the technical field of a multicolor overprinting color printing method under a fluorescent lamp.

Background

Fluorescent ink is one of the more used inks in ticket printing, and the main component of the fluorescent ink is fluorescent pigment. The fluorescent pigment belongs to a functional luminescent pigment, and is different from a common pigment in that when external light irradiates, energy of a certain form can be absorbed, photons are excited, and the absorbed energy is released in a low visible light form, so that a fluorescent phenomenon with different hues is generated. The different colors of light combine to form an exceptionally bright color, and when the light ceases to be emitted, the phenomenon of luminescence disappears, hence the name fluorescent pigment.

In fluorescent printing, because display effects under two different conditions of daily illumination and special illumination need to be presented, the problem that the effect is difficult to be considered is inevitably caused, in the prior art, color blending is generally carried out through CMYK color values, and the printing effect needs to be improved in the aspects of color rendering effect, brightness and the like.

The color-developing fresh fruit of the fluorescent printing can be improved by realizing more proper proportioning adjustment of the fluorescent ink through better color separation operation.

Disclosure of Invention

The invention aims to: the color development effect of fluorescent printing in the prior art is improved. In order to solve the technical problem, the invention provides a multicolor overprinting color printing method under a fluorescent lamp.

The invention specifically adopts the following technical scheme for realizing the purpose:

a multicolor overprinting color printing method under a fluorescent lamp comprises the following steps:

step S1: performing RGB color separation processing on an image to be printed according to the color light additive method principle;

step S2: making an RGB printing file;

step S3: making a format and performing haircut;

step S4: and adjusting the proportion of the RGB fluorescent ink according to the RGB color separation processing result, and printing the image according to the format.

Preferably, in step S1, the method for RGB color separation processing of an image according to the color light adding principle includes:

step S101: splitting the image into an R diagram, a G diagram, a B diagram and a W diagram based on the partition of the RGB image;

step S102: performing reverse color operation on the R diagram, the G diagram and the B diagram respectively;

step S103: respectively manufacturing the R picture, the G picture and the B picture after the reverse color operation into special red, special green and special blue printing plates, and independently processing the W picture part to independently manufacture a white printing plate;

step S104: and according to the color tendency of the image before the RGB color separation processing, carrying out image processing on the image according to a color light additive method and a color light subtractive method.

Preferably, the method of the reverse color operation in step S102 is: inversion by image processing or adjustment by image curve.

Preferably, in step S2, the method for making an RGB print file includes: the four color CMYK file is converted into an RGB file.

Preferably, in step S3, the hair-arranging mode is an amplitude-modulated net hair-arranging mode.

Preferably, in step S3, the number of screened lines used in the queue is 300 lines.

Preferably, in the step S3, the screening angles used in the hair rows are R40 degrees, G13 degrees, B85 degrees, and w70 degrees.

Preferably, after the step S4, the printing effect of the printed product is confirmed under daily illumination and ultraviolet illumination, respectively.

The invention has the following beneficial effects:

according to the invention, the color separation is carried out on the image to be printed by using the color light additive method principle, the proportion of RGB ink is calculated, fine adjustment can be carried out according to the actual image effect, and the actually required color development effect of the image is restored; the method adopts RGB to directly allocate, is simple and convenient to operate when fine adjustment is carried out according to the actual image effect, has clear effect, and can be quickly adjusted to a required value; the printed finished product has higher brightness in color development, and the color of the printed finished product is more vivid, so that the printed finished product has better color development effect under daily illumination and special illumination; the image can be more refined by the arrangement scheme selected by the invention; the invention finally inspects the printed finished product, thereby preventing defective products and further ensuring that the effect of the printed finished product meets the requirements.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

FIG. 2 is a schematic view of a first reverse color operation of example 1;

FIG. 3 is a schematic view of a second reverse color operation of example 1;

FIG. 4 is a third reverse color operation of example 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, the present embodiment provides a multicolor overprinting color printing method under a fluorescent lamp, comprising the following steps:

step S1: performing RGB color separation processing on an image to be printed according to a color light additive method principle;

step S2: making an RGB printing file;

step S3: making a format and performing haircut;

The basic implementation principle of the embodiment is as follows:

the traditional fluorescent printing method prints the most suitable and matching color according to the adjustment of the color values of CMYK. The method adopted by the embodiment calculates the RGB color values corresponding to the CMYK common ink hues by carrying out RGB color separation processing on the actual image, so that the color deviation can be quickly and conveniently judged in the later printing process, and purposefully adjusted.

As a preferable configuration of this embodiment, in the step S1, the method for performing RGB color separation processing on an image according to the color light addition principle includes:

step S102: respectively carrying out reverse color operation on the R image, the G image and the B image; the reverse operation is to perform a reverse color conversion operation, and several comparison examples before and after the reverse operation are shown in fig. 2, 3 and 4, where fig. 2-4 are: the left side of the figure is an image before the reverse color operation, and the right side of the figure is an image after the reverse color operation;

Further, the method of the reverse color operation in step S102 is: inversion by image processing or adjustment by image curve. Specifically, for example, the inversion operation is implemented by some basic image processing software, or the brightness and the like of the image can be adjusted by curve adjustment, so that the inversion operation of the image can also be implemented by such adjustment.

The traditional printing four-color separation mode (CMYK) is a color register mode adopted in color printing, which utilizes the principle of color mixing of three primary colors of color materials and black ink to mix and superpose four colors in total to form so-called full-color printing. The color light adding method is a color generation method for generating new color light by mixing color light and color light, and specifically comprises the following steps:

(1) since white light including all colors can be obtained by adding energy such as three primary colors, R (red) + G (green) + B (blue) ═ W (white)

(2) When the three primary colors of light are added in unequal amounts, the color deviation ratio is larger.

(3) The equal addition of any two of the three primary colors of light can yield cyan (C), magenta (M), and yellow (Y), respectively, that is:

G+B＝C,C+R＝W；

R+G＝Y,Y+B＝W；

B+R＝M,M+G＝W；

(4) the brightness of the mixed primary color light is higher than that of the original color light, so that the color printed by the method is brighter.

Example 2

The embodiment is based on the technical scheme of the embodiment 1, and the basic steps are as follows:

step S2: manufacturing an RGB printed file;

step S3: making a format and performing haircut;

On the other hand, in the prior art, printing is generally performed by adjusting color values of CMYK. The CMYK mode is a color mode, and when sunlight is irradiated to an object, the object absorbs a part of light and reflects the rest of light, and the reflected light is a subtractive color mode of colors of the object that we see, and is fundamentally different from the RGB mode. According to this subtractive color scheme, a CMYK color scheme suitable for printing is derived. The subtractive colour model is used not only when we look at the colour of an object, but also 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 it is difficult to superimpose cyan, magenta and yellow to form true black, at best just brown. So that the K-black is introduced. The black color is used for strengthening the dark tone and deepening the color of the dark part.

In contrast, RGB colors are the commonly known three primary optical colors, R stands for Red (Red), G stands for Green (Green), and B stands for Blue (Blue). Any color that can be seen by the naked eye in nature can be formed by mixing and superimposing these three colors, and is therefore also referred to as an additive color mode. The RGB mode is also called RGB color space. The color light is a color light and color expression mode, and is widely applied to our lives, such as televisions, computer display screens, slides and the like, which all use light to express colors. In printing and publishing, images are often 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 amount of radiation R, G, B.

We can build both CMYK and RGB into Lab coordinates where L is 0 to 100, with larger values indicating brighter colors, a representing green to red change and b representing blue to yellow change.

The Lab value of CMYK represents a Lab value of a common ink, and the Lab value of R and the Lab value of G in the above figure are obtained by an experimental test, and then the hue parameters of Y which is close to the visual effect of a human are calculated by adjusting the hues of the inks of R and G based on the principle that R + G is Y. Similarly, in the equation G + B ═ C, the GLab hue value is known, and the Lab hue value of B is measured from the Lab hue value of the usual ink C. In the equation B + R ═ M, the Lab hue value of B is known, and the Lab hue value of B is measured from the Lab hue value of the usual ink M. The R fluorescent ink, the G fluorescent ink and the B fluorescent ink are determined by the method, and the printing effect shown under a fluorescent lamp is printed by parameters such as fluorescent hue content, number and angle of lines, image curve, fluorescent toner particles and the like in the inks.

Therefore, in actual printing, the balanced RGB fluorescent ink is selected, that is, the equal amounts of R, G and B in the ink are added to obtain just W, and then the printing color is adjusted according to the color separation condition in the steps of the example.

In a preferred embodiment, in step S3, the hair-arranging mode is an amplitude-modulated net hair-arranging mode.

As another preferred embodiment, in the step S3, the screening angles used in the hair row are R40 degrees, G13 degrees, B85 degrees, and w70 degrees.

Example 3

This example is based on the technical solution of example 1.

The improvement point is that, in the present embodiment, after the step S4, the printing effect confirmation is performed on the printing product under the daily illumination and the ultraviolet illumination, respectively.

The respective confirmation of the printing effect is to ensure that the printing quality reaches the standard, for example, the qualification is determined only when the color development condition, the definition and the like reach the requirements.

Claims

1. A multicolor overprinting color printing method under a fluorescent lamp is characterized by comprising the following steps:

step S2: making an RGB printing file;

step S3: making a format and performing haircut;

2. The method for multicolor overprinting under fluorescent lamp according to claim 1, wherein in step S1, the method for RGB color separation of images according to the color light additive method comprises:

step S102: respectively carrying out reverse color operation on the R image, the G image and the B image;

3. The method for multicolor overprinting under fluorescent lamp according to claim 2, wherein the method of the reverse color operation in step S102 is: inversion by image processing or adjustment by image curve.

4. The method for multicolor overprinting under fluorescent lamp according to claim 1, wherein in step S2, the method for making the RGB printed documents is: the four color CMYK file is converted into an RGB file.

5. The method for multicolor overprinting under fluorescent lamps according to claim 1, wherein in step S3, the hair arrangement mode is amplitude modulation mesh hair arrangement mode.

6. The method for multicolor overprinting under fluorescent lamps according to claim 5, wherein the number of screened lines used in said row is 300 lines in said step S3.

7. The method for multicolor overprinting under fluorescent lamps as claimed in claim 6, wherein the screening angles used in said hair rows in step S3 are R40 degrees, G13 degrees, B85 degrees, and w70 degrees.

8. The method for multicolor overprinting under fluorescent lamp according to claim 1, wherein after said step S4, the printing effect of the printed product is confirmed under daily illumination and under ultraviolet illumination, respectively.