Ink color and ink (1)

In the actual screen printing, there are two kinds of color printing methods, one is dot printing, the other is spot color printing. Dot printing can print colorful and layered prints, but the colors are softer and generally used in the advertising industry. Spot color printing can print thick and bright color effects, and does not require color separation, but with multi-color overprinting, color spot color printing is achieved by spot color ink for spot color printing, so there are also no The small printing industry adopts spot color printing, but due to the ever-changing spot colors of printing, it is impossible and unnecessary for ink manufacturers to manufacture various hue inks, and often only a few basic color inks are produced. This is for printing companies. In this case, it is necessary to perform ink color matching to reproduce the original color. Here's an overview of the palette of inks.
First, the basic knowledge of color The relationship between color and light. The physical basis of color light is light, and colors must exist in the presence of light. If there is no light, there will be no color, and it will be dark, so there is only light.
2. The three primary colors of light. In everyday life, the natural colors we can see are red, orange, yellow, green, cyan, blue, and purple. In the entire visible light, the longest wavelengths we most sensitive to are red, green, and blue, and orange. The three colors of yellow, blue and cyan only occupy a very narrow position between the three colors of red, green and blue. Actually, they are also obtained by mixing red, green, and blue light, and red, green, and blue light. However, it cannot be mixed with other shades. So we call red, green and blue the three primary colors of light.
3. Shade mixing.
(1) Concept: The blending of shades is an additive method (combined effect of two or more shades of light, called additive method.
(2) Mixing rules: The primary light is added by equal amounts.
Red light + green light = yellow light green light + blue light = blue light blue light + red light = magenta light light light Three primary colors and color light addition method If two kinds of color lights are mixed in a certain proportion to become achromatic color, the two color lights complement each other.
Blue + Yellow = White Green + Magenta = White Red + Blue = White The complementary colors of red, green and blue are yellow, magenta and cyan.
Color light trichromatic and color light additive 4. Mix of pigments. The mixing of the colorant is a subtractive method, which reflects a phenomenon that a certain color is obtained by subtracting some color light from white light. When the pigment shows a certain color, it means that the color material is selective to certain color lights in the white light spectrum. Absorption, minus the results of some white light, such as: yellow, that is absorbed blue, purple, reflected red, green, red + green = yellow, that is, yellow.
Subtractive substances are divided into reflectors and transmissives. People can observe colors from the front of colored objects. They are called reflectors. The color behind them is called transmissive.
5. The three primary colors of pigments. According to the mixing rules of the colorants, each primary color of the colorant should reflect the color light of the two spectral regions, and the three primary colors of light, red, green, blue, and light, can be obtained by a mixture of three methods: magenta, yellow, and cyan. For the three primary colors of pigment, it is the basis for mixing other colors, which are consistent with the complementary colors of the three primary colors of light.
Second, the color principle 1. The mixing of colors is a process of color reduction. The more colors are added, the more shades of color are subtracted, and the darker they appear. For this reason, it is preferable to use three primary colors or basic colors when matching colors. There are 1330 kinds of colors that can be allocated with the three primary colors. If you add black, you can get as many as 14640 kinds, that is, almost all colors can be adjusted. For example, the color on the PANTON color card. The mixing rules for the three primary colors of pigments are:
Magenta + yellow = red yellow + blue = green magenta + blue = blue primary colors are added together, equal amounts of yellow, magenta, and green phases are added in black.
The mixing rule for the equal amount of inter-color and inter-color is:
Red + Green = Red Green (yellow grey)
Green + Blue = Green Blue (Cyan)
Blue + red = blue red (red-gray) (to be continued)