What color is red plus blue?

Purple.

Three primary colors:

The three primary color light model (English: RGB color model), also known as the RGB color model or the red, green and blue color model, is an additive color model that combines red ), green (Green), and blue (Blue) three primary colors of color light are added in different proportions to produce a variety of color lights. The left side of the picture above shows the three primary colors of light and color, and the right side shows the three primary colors of art.

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

RGB is a device-dependent color space: different devices detect and reproduce specific RGB values ??differently because of the color substances (fluorophores or dyes) and their effects on red, green, and blue. The individual response levels vary from manufacturer to manufacturer and even from time to time for the same device.

The three primary colors refer to the three basic colors that cannot be broken down. The three primary colors we usually call are magenta, yellow, and cyan. The three primary colors can be mixed to produce all colors and add up to black at the same time. Black, white and gray are colorless systems. In the color, the mixed color of the three primary colors of the pigment is black, and the mixed color of the three primary colors as a light-based material is white due to the special properties of light. Extended information

Application of color mixing principles:

Color is like cooking, you need to control the heat. If the colors are not blended enough, it will appear "raw" and "angry". The variety of pigments should be used as little as possible, including black and white. Generally, no more than four colors can be mixed to produce the required color. Adding the fifth or more colors can only increase the black and gray. The contrasting colors are black and gray.

Some people think that adding different pigments can enrich the colors, but in fact it can only reduce the purity. Experienced painters often use a few simple colors to achieve beautiful and elegant effects. When the colors are mixed properly, there will be a moist feeling. When applied to the canvas, the pigments will seep into the picture and retreat into the space. On the contrary, the colors will appear dry and floating, which is not good.

According to the ingredients contained in the pigment, color can be divided into pure color, clear color and turbid color. A pure color does not contain white, a clear color contains only black, or only white, and a turbid color contains both black and white, that is, it contains gray.

Baidu Encyclopedia-Three Primary Colors