1. When making a plate, the original should be divided into cyan (C), magenta (M), yellow (Y), and black (K). What is the principle of color separation?
Answer: There are tens of thousands of colors on a color artwork or color photo. It is almost impossible to print these tens of thousands of colors one by one. The printing method is four-color printing. That is, the color of the original is decomposed into four color plates of cyan (C), magenta (M), yellow (Y), and black (K), and then the colors are combined during printing. The so-called "color separation" is based on the principle of the subtractive color method, using the red, green, and blue color filters to selectively absorb the color light of different wavelengths, and the original is decomposed into three primary colors of yellow, magenta, and cyan. In the color separation process, the color light absorbed by the color filter is the complementary color light of the color filter itself, so that a negative film of black and white images is formed on the photosensitive film, and then screened to form a dot negative film, and finally copied and dried into various colors Printing plate. This is the earliest principle of photographic color separation.
Due to the development of printing technology, we can now separate, sample and convert the color of the original color into digital information through the pre-press scanning equipment, that is, use the same method as the photoengraving to decompose the original color into red (R), green (G), Blue (B) three colors, and digitize, and then use the computer to mathematically decompose the digital information into cyan (C), magenta (M), yellow (Y), black (K) four-color information.
2. Why should the screen be printed before printing?
Answer: Because the printing process determines that printing can only use dots to reproduce the continuous level adjustment of the original, as shown in Figure 1-2. If you zoom in on this picture, you will find that it is composed of countless dots of different sizes. We see that although the dot sizes are different, they all occupy the same size of space. This is because after the original image is screened, the image is divided into countless regularly arranged dots, that is, the continuous image information is turned into discrete dots Image information. The larger the dot, the darker the color and the darker the level; the smaller the dot, the lighter the color and the brighter the level, as shown in Figure 1-3. The size of the fixed space occupied by each dot is determined by the number of screens. For example, if the mesh size is 150lpi, there are 150 dots in one inch of length or width. The location of the dot space and the dot size are two different concepts. For example, C50% represents the meaning that the dot size accounts for 50% of the dot space position, and 100% means that the dot size completely covers the dot space position, which is called in the printing. "On the ground", 0%, because there is no dot, only the spatial location of the dot, so no ink is printed on this place. Obviously, the larger the number of linked meshes, the smaller the space occupied by the dots, and the more levels of detail that can be described. In fact, the layers and colors of the original are reproduced by this method of hanging the net.
3. What is process color?
Answer: Process color is a color composed of different percentages of C, M, Y, and K, so it is more reasonable to call it a mixed color. C, M, Y, K are the four primary colors commonly used in printing. When printing primary colors, these four colors have their own color plates. The dots of this color are recorded on the color plates. These dots are generated by the halftone screen, and the four color plates are formed together. The primary colors defined. Other primary colors can be formed by adjusting the size and spacing of color dots on the Internet. In fact, the four printing colors on the paper are separated, but they are very close. Due to the limited resolution of our eyes, they cannot be distinguished. The visual impression we get is the mixed effect of various colors, so a variety of primary colors are produced.
Y, M, C can synthesize almost all colors, but black is also needed, because the black produced by Y, M, C is impure, and a more pure black is required when printing, and if Y, M, C is used to produce There will be too much local ink in black.
4. What are the equipment of the color desktop publishing system? What are the software?
Answer: The color desktop publishing system is composed of three parts: the image input part, the image processing part, and the image output part. The specific components of each part are as follows:
(1) Graphic input section
Equipment: scanner, digital camera, computer.
Software: device driver software, and operating system of MAC and PC.
(2) Graphic processing section
Equipment: computer.
Software: 1. Computer software: Image processing software is Photoshop and Painter. 2. Graphics software: FreeHan d, CorelDraw. 3. The typesetting software is PageMaker, QuarkXpress. 3D image creation software: 3DS, Infihi-D, Strate-StudioPRO.
(3) Graphic output section
Equipment: computer, color printer, laser printer, laser imagesetter, direct plate-making machine, plate-making machine, etc., direct digital printing machine.
Software: RIP, driver software, font library.
2-10 Makeup Brush sets are used. Many people don`t know much about makeup sets. There are too many practical skills for makeup brushes.
1. The big brush
It can be used as a base for large areas of eye shadow, and can also be used as a splash foundation.
2. Foundation Brush
The role of the foundation brush is to apply liquid foundation and foundation cream to evenly make up the face;
The foundation brush can be selected according to the following points: the density of the bristles should be tight and the quality of the bristles is harder; the bristles should be oblique trapezoid, and the brushes with good elasticity of the bristles should be selected; it is best to choose mink or synthetic fibers in terms of material.
3. Nose bridge brush
How to use the nose bridge brush
4. Fan Brush
The main function of the fan brush is to sweep away excess loose powder and eye shadow powder on the face.
5. Eye shadow brush
Eye shadow brushes can show soft colors, and can be subdivided into many different styles according to their functions. If you don't know how to choose, it is recommended to buy a large, medium and small eyeshadow brush first;
A large brush is used to apply light-colored eyeshadow as a primer; a medium-sized brush can be used to retouch the eye area more delicately; a small-sized brush is used to refine the eyeshadow, especially one with a tight, angled brush head, which can be used to strengthen the eyes Outline.
6. Concealer Brush
Concealer brushes, as the name suggests, are used to apply concealer products to the areas that need to be concealed, such as spots, acne marks, dark circles, etc. It can help you to create the details. Usually used in conjunction with a foundation brush, using a concealer brush can make the concealer more even and natural.
7. Lip Brush
Lip brush, lip balm and lip gloss, can also be used to brush eyeliner, when applying lipstick, start from the lower lip. In the drawn lip line, apply from the inside out. When applying lip gloss with a lip brush, do not use too much force, and do not bend the bristles too much, so as not to fall off and break.
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