What are the three primary colors of the pigment? What are the inorganic pigments?

What are the three primary colors of the pigment? What are the inorganic pigments?

Three primary colors

The RGB color model, also known as the RGB color model or the red, green and blue color model, is an additive color model that uses different colors of red, green, and blue. The ratios are added to produce a variety of shades.

The main purpose of the RGB color model is to detect, represent and display images in electronic systems, such as televisions and computers, but also in traditional photography. Before the electronic age, based on human perception of color, the RGB color model has solid theoretical support.

RGB is a device-dependent color space: different devices detect and reproduce specific RGB values ​​differently because color substances (fluoresceers or dyes) and their individual response levels to red, green, and blue are manufactured The quotient varies, and even the same equipment varies in time.

Nonlinear

Due to gamma correction, the intensity of the color output on a computer display device is typically not directly proportional to the R, G, and B values ​​in the image file. That is, even if the value of 0.5 is very close to half of 0 to 1.0 (full intensity), the light intensity of the computer monitor at the time of display (0.5, 0.5, 0.5) is usually (on the standard 2.2-gamma CRT/LCD) is displayed ( 1.0, 1.0, 1.0) is about 22%, not 50%.

In the schematic diagram of the color light addition method and the color material subtraction method, the left picture shows the three primary colors of color light: red, green, and blue; the right picture shows the three primary colors of the color (pigment): yellow (yellow) , magenta (magenta), cyan (cyan).

The three primary colors of the color light refer to the three colors of red, green and blue, and the respective wavelengths are 700 nm, 546.1 nm, and 435.8 nm, respectively, and the three primary colors of the light are different from the three primary colors of the object. The three primary colors of light can be mixed in a certain ratio to present various light colors. According to the results of Thomas Young and Helmhaus. These three primary colors are determined to be red, green, and blue (equivalent to the color sensation of red, medium, and ultramarine in the pigment). The color TV screen is composed of three red, green and blue light-emitting dots. The three primary colors are mixed according to different proportions and strengths. Can produce a variety of color changes in nature. The three primary colors of pigments and other non-luminescent objects are magenta (equivalent to rose red, peach red), green (equivalent to deeper sky blue, lake blue), and light yellow (equivalent to lemon yellow). The three primary colors selected by the British chemist Foster (1781 - 1868) can be mixed in a variety of colors, but can not be blended with black, only dark gray can be mixed. Therefore, in color printing, in addition to the three primary colors used, a black version is added. To get a deep color. [1]

In the art, red, yellow and blue are defined as the three primary colors of color, but magenta plus appropriate amount of yellow can call out red (red = M100 + Y100), while red is unable to call out magenta; green plus appropriate amount of magenta can get blue ( Blue = C100 + M100), while blue plus green is not bright green; yellow, magenta, cyan can be used to blend more colors, and pure and bright. Green (green = Y100 + C100), which is green and yellow, is more pure and brighter than blue and yellow, while the latter is more gray; magenta and blue are very pure. (Purple = C20 + M80), while red and blue can only get gray purple and so on. In addition, from the perspective of blending other colors, yellow, magenta, and cyan are the primary colors, and the colors are more abundant, and the color is more pure and bright. (In 3D MAX, the three primary colors are: red, yellow and blue)

Whether it is based on the definition of the primary color or the result of the actual application, it is sufficient to describe that yellow, magenta and green are called the three primary colors, and it is more appropriate to use the three primary colors of red, yellow and blue.

Pigment primary color

Color printing inks, the principle and production of color photos, color printer design and practical applications are all yellow, magenta and blue. Color prints are printed with yellow, magenta, and cyan inks and black inks. The printing of four-color color presses is a typical example. In the imaging of color photographs, the three emulsion layers are: yellow for the bottom layer, magenta for the middle layer, and cyan for the upper layer. All brands of color inkjet printers also print color pictures in yellow, magenta, and blue plus black ink cartridges. By definition, the primary color should be able to modulate most of the other colors, while the other colors cannot be adjusted to the primary colors.

Art practice proves that magenta plus a small amount of yellow can bring out red (red = M100 + Y100), while red can not transfer magenta; green plus a small amount of magenta can get blue (blue = C100 + M100), and blue plus white It’s not bright green

What is inorganic pigment?

The color is stable, the light resistance is good, and the long-term drying will become gray, such as titanium white, zinc white, ultramarine blue, sky blue, blue, cadmium, cobalt and the like.

The chemical composition of zinc white is zinc oxide, the scientific name of zinc oxide powder. Zinc white powder is slightly lighter than lead white powder, which is whiter than lead white. It is stable and yellow for a long time. After drying, the color layer is firmer, but it has more oil, and the coverage is not as strong as lead white, it is slower to dry, brittle and easy to crack. European painters have only used zinc white pigments since 1840. Zinc white heat (direct sunlight) will turn into lemon yellow, and when it cools, it will return to white. Zinc white is not toxic, it is colder than lead white, and has a blue tendency.

The chemical composition of titanium dioxide is titanium oxide, which is an inert pigment. It is not affected by climatic conditions and has strong covering power. It is a pigment produced in modern times. Pure titanium white color dries quickly, and tends to turn yellow after drying, so it is often mixed with zinc white. Zinc-titanium white not only reduces the brittleness of zinc white, but also improves the shortcomings of titanium white alone. Titanium white has the same non-toxic advantages as zinc white. Zinc-titanium white is a white pigment with a large amount in China.

Sky Blue: It is a color similar to cobalt blue. It has a certain stability, and the microstrip is green, bright, pure and compact. Durable and easy to dry.

Pu Lan, also known as Paris Blue, is a compound of iron and cyanide with strong tinting strength. Stable and dry faster. It will oxidize with lead white, cadmium, and red, and will make the picture brown after a long time.