Principles of Additive and Subtractive Colors of Light 10

The mixing of the three primary colors of pigments, also known as subtractive color mixing.

The so-called primary color, also known as the primary color, or the primary color, is the basic color used to mix other colors. Primary colors have the highest color purity, the purest and most vivid. Most colors can be blended, while other colors cannot be blended to create three primary colors.

In terms of understanding the concept of the three primary colors, we are basically the same as those in the textbooks. The three primary colors are divided into two categories, one is the chromatic primary color, which is called the additive color method three primary colors; The other type is the pigment (dye) three primary colors, also known as the subtractive color three primary colors. The latter is described in the art book.

The mixing of the three primary colors of pigments, also known as subtractive color mixing, is the reduction of light, after the mixing of the two colors, the luminosity is lower than the original luminosity of the two colors, the more colors are combined, the more light is absorbed, and the closer it is to black. Therefore, the more times it is blended, the worse the purity, and the more it loses its simplicity and distinctiveness. The mixture of the three primary pigments, which should theoretically be black, is actually a black cloudy color with very poor purity, and can also be considered a dark gray with very low luminosity.

Magenta and green, yellow and purple, cyan and orange, the mix of colors is close to black.

Art textbooks talk about the use of paint in painting, and the author has seen that most textbooks and books refer to red, yellow, and blue as the three primary colors. However, the situation in art practice and production operations is not consistent with what the textbooks say. The ink blending of color printing, the principle and production of color **, the design and practical application of color printers, are yellow, magenta, and blue are the three primary colors.

Color printing is printed with yellow, magenta, and blue inks plus black ink, and the printing of four-color printing press is a typical example. In color** imaging, the three emulsion layers are: yellow on the bottom layer, magenta on the middle layer, and cyan on the upper layer.

All brands of color inkjet printers are also printed in yellow, magenta, blue and black ink cartridges. By definition, primary colors should be able to modulate most of the other colors, and none of the other colors can be blended. Art practice has proved that magenta with a small amount of yellow can make a big red, but a big red can't make a magenta; Blue can be obtained by adding a small amount of magenta, while blue and white can get a non-vivid blue; Yellow, magenta, and cyan can be used to create more colors, and they are pure and vivid.

For example, the green of blue and yellow is more pure and vivid than the green of blue and yellow, while the latter is darker. The purple blended by magenta and cyan is very pure, while the red and blue can only get gray purple and so on. In addition, judging from the mixing of other colors, yellow, magenta, and blue are used as their primary colors, and the colors are richer and the colors are more pure and vivid.

To sum up, whether it is from the definition of primary colors or verified by the results of practical application, it is enough to show that yellow, magenta, and blue are called the three primary colors, which is more appropriate than red, yellow, and blue.

You're talking about the three primary colors of light. It's still color.。。 As long as it is. Light of red, green, blue. Colored. Red, yellow, and blue.

Additive color method, subtractive color method, these two terms are more used in advertising, printing, and printing industries, and understanding these two definitions is also very helpful for color grading in the later stage of photography. The principle and characteristics of the two image output methods are actually different.

For example: Draw on a chalkboard with chalk, the blackboard is black, and the more you draw, the less dark the blackboard becomes.

Write on the whiteboard with a pen, the whiteboard is white, and the more you paint, the less white the whiteboard becomes.

Additive and subtractive methods are similar.

If the medium itself is black, the more it is output, the less black the medium will be, which is called additive color.

If the medium itself is white, the more it is output, the less white the medium will be, which is called subtractive color.

Black, which is considered to contain no color, is what color we add to it, and what color we can see is this color. (Additive color): Red = Black + Red; Blue = Black + Blue; Green = Black + Green.

White, which contains all colors, as long as one or several colors are removed from white, then what we can observe is the mixture of the remaining colors (subtractive color): red = white - cyan; Blue = White-Yellow; Green = White - Color.

From the habit of looking at computer monitors, we will feel that the additive color method is more intuitive, and the larger the value of r, g, and b, the brighter the screen.

The color printer prints on white paper**, the more ink is sprayed, the darker the place, and the brighter the place, the less ink is sprayed, which is the subtractive color method.

It can be seen that from the display to the printer, the middle has undergone a transformation from additive color method to subtractive color method. Theoretically, the yellow magentain three colors of the subtractive color method can already be mixed into black, but in fact, there is a separate black cartridge in the color printer, the reason is that the yellow magentain pigment that cannot be manufactured to obtain pure color is made, and the second is that it is more economical to directly make black pigment printing.

As a simple example, the various colors of light mixed together are white, which is the result of the sum of the colors of the light. The mixture of various colors of paint is black, which means the subtraction of colors.