The range of the visible spectrum for the human eye is between 400 and 700 nanometers. Different wavelengths of light are perceived as different colors, determined by the biological characteristics of the human eye and semantic conventions. Theoretically, the three primary colors in painting—red, yellow, and blue—can be mixed to create all visible colors. However, in practical production, we still require the direct involvement of other colors. The primary colors of red, yellow, and blue in nature follow a completely different logic compared to digital color protocols. Colors in nature result from the absorption and refraction of continuous, uninterrupted sunlight on objects, whereas the colors displayed on screens are emitted by the screen as a direct artificial light source. Therefore, we know that the most famous digital color protocol involves the three primary colors: Red, Green, and Blue (RGB). From their inception, the RGB primary colors have been embedded within the semantics of how humans describe colors. As light signals directly displayed by screens, their effects are directly limited by the different screens. Even if we set the same values, this only means that they are the same within the color protocol. In actual viewing, the colors we perceive are influenced by our own eyes and the display screens. Thus, colors with the same numerical values should appear different on different screens. Determining the primary colors of red, yellow, and blue in nature within digital color thus becomes a form of simulation.