Which of the following is NOT considered a triadic color scheme?

A triadic color scheme is based on three colors that are evenly spaced on the color wheel, creating a vibrant and balanced look. This type of scheme is effective in design because it allows for a harmonious yet dynamic combination of colors.

The combination of colors in the option identified as not being a triadic color scheme—green, violet, and red—does not fulfill the criteria of being evenly spaced on the color wheel. Instead, green and violet are adjacent to each other, while red is quite distant, creating a less harmonious relationship.

In contrast, the other options represent classic triadic arrangements. For instance, blue, yellow, and red form a triadic scheme because they are spaced evenly across the color wheel. Similarly, purple, orange, and green; as well as red, yellow, and blue, are also triadic because they maintain the necessary spacing to provide that distinct vibrancy and balance typical of triadic schemes.