Red and blue color scheme on poster

Quick answer：

A red and blue color scheme on a poster typically involves the use of these two colors to convey a certain mood or message. Red is often associated with passion, energy, and danger, while blue can represent calmness, trust, and stability. The combination of these colors can create a dynamic and visually striking design, often used for marketing or promotional materials. The choice of shades, saturation, and value within the red and blue spectrum can greatly influence the overall impact of the poster's design.