The choice of using blue instead of violet in RGB (Red, Green, Blue) color models is primarily based on practical considerations and historical reasons rather than purely scientific ones.
Firstly, it's important to note that RGB color models are primarily used for display devices such as computer monitors, televisions, and screens. These devices use a combination of red, green, and blue light to create a wide range of colors. In this context, the choice of colors is based on the technology available and the human perception of color.
One reason blue is used instead of violet is due to the limitations of early display technologies. Early color displays were primarily based on phosphors, and blue phosphors were more readily available and easier to produce than violet phosphors. Therefore, blue was chosen as one of the primary colors in RGB systems.
From a human perception standpoint, there is also a practical consideration. The human eye is generally less sensitive to violet light compared to blue light. Violet light has a shorter wavelength and higher energy than blue light, and it can be more challenging to produce and perceive accurately. By using blue as one of the primary colors, it is possible to achieve a wider range of visible colors with good accuracy and balance.
It's worth mentioning that in certain color models and applications, such as additive color mixing in light spectrums or in scientific contexts, violet is included as one of the primary colors. For example, in the additive color model used in physics, violet, along with red and green, can be used as the primary colors.
In summary, the choice of using blue instead of violet in RGB color models is influenced by technological constraints, ease of production, and human perception considerations. These factors have led to the widespread use of blue as one of the primary colors in RGB systems for display devices.