Final answer:
Brightness or intensity of a color is determined by its saturation. The color with the highest level of saturation is considered the brightest, although it may vary depending on the individual's perception.
Step-by-step explanation:
The question asks about the brightest color. Brightness or intensity of a color is determined by its saturation. Saturation refers to how bright or dull a color is. The color with the highest level of saturation is considered the brightest.
According to the information provided, humans have very sensitive perception of color and can distinguish about 500 levels of brightness. While red, orange, yellow, green, blue, indigo, and violet are all colors of the visual spectrum, the color that is perceived as the brightest may vary depending on the individual's perception.
Therefore, it is subjective to identify the absolute brightest color as it can vary from person to person.